Journal articles: 'Radar power supply'

1

Rodriguez, Miguel, Michael Roberg, Andrew Zai, Eduard Alarcon, Zoya Popovic, and Dragan Maksimovic. "Resonant Pulse-Shaping Power Supply for Radar Transmitters." IEEE Transactions on Power Electronics 29, no. 2 (February 2014): 707–18. http://dx.doi.org/10.1109/tpel.2013.2256471.

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Leng, Jian Wei, and Xu Jia. "Design of Radar Level Measurement Instrument Based on the UC3844." Applied Mechanics and Materials 392 (September 2013): 709–12. http://dx.doi.org/10.4028/www.scientific.net/amm.392.709.

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Introduced the internal function of UC3844, and analyzed the working important point of switching power supply. Planning and design of the radar level measurement instrument of multiple output power supply circuit.

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Wang, Wei Chang, and Jin Cheng Zhao. "The Researching of a Power Supply Design Scheme for T/R Assemblies." Applied Mechanics and Materials 556-562 (May 2014): 1802–5. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.1802.

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This paper presents a distributed power supply scheme for T/R assemblies which are the key pate of the active phased radar. Based on the analysis of the characteristics and design difficulties of T/R assemblies, the power supply uses the energy storage capacitor to provide the high peak current during the pulse, and uses the way of distributed power supply scheme to improve the reliability of power supply system. The power supply designed using this method can achieve load sharing for power supply Assemblies and effectively improve the accuracy of supply voltage.

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Zhang, Yingying, Zhiwei Chen, Bing Li, and Yigang He. "Application of Low Harmonic 18-Pulse Rectifier Power Supply for Radar Power System." IEEE Transactions on Industrial Electronics 66, no. 2 (February 2019): 1080–88. http://dx.doi.org/10.1109/tie.2018.2831188.

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Zhang, Xin Yu. "Automotive Anti-Collision Radar Signal Processing System Design Based on DSP." Advanced Materials Research 1044-1045 (October 2014): 727–30. http://dx.doi.org/10.4028/www.scientific.net/amr.1044-1045.727.

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The principle of the frequency modulated continuous wave radar for measuring distance and velocity and signal processing method are described in this paper; To solve the signal processing problem for FMCW automotive anti-collision radar system ,the radar signal processing circuit is researched and designed, including the design of corresponding gain control amplifier circuit, power supply and filter circuit, external memory circuit ,power supply circuit ,signal interface circuit, and analyzed the results of the measurement for system. Experiments showed that the system achieved good accuracy design effect and higher measurement precision and has certain positive role to improve vehicle safety.

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Da, Ting. "Photoelectric Sensor Circuit and Image Segmentation Method for Radar System." Journal of Nanoelectronics and Optoelectronics 16, no. 2 (February 1, 2021): 170–78. http://dx.doi.org/10.1166/jno.2021.2920.

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In this exploration, based on the principle and system parameters of laser three-dimensional (3D) radar imaging technology, the corresponding photoelectric sensor circuit scheme is formulated. The sense circuit of avalanche photon diode (APD) converts the signal through the transresistance amplifier circuit. Then, LMH6629 is selected as a precision amplifier with low input noise voltage and low input error current. The capacitance is used as a compensation element to compensate the phase. For the power supply scheme, choosing the mode of switching power supply and LDO to work together can improve the efficiency of power supply and reduce the output of current ripple. At the same time, semantic segmentation is carried out for the obtained photoelectric images. Based on the traditional spatial pyramid pooling algorithm, the fusion of mean intersection over union and cross information entropy loss function is introduced to improve the weight of local image region. In the experiment, Multisim software is used to simulate the circuit. The APD reverse bias voltage is set to 90 V, and the multiplication coefficient is 98.7. The feedback resistance, bandwidth, phase compensation capacitance and other parameters are further calculated. It is found that there is obvious self-excited phenomenon in the output waveform of the transresistance amplifier without phase compensation capacitor. When the feedback capacitance reaches 0.8 pF, the oscillation phenomenon is obviously reduced; further calculation shows that the bandwidth of transresistance amplifier is 230 MHz, and the noise of APD power supply is mainly caused by BUCK switching power supply switch when the bottom noise of oscilloscope is ignored. However, the noise is suppressed under the action of the back-end LDO device; after the loss function is introduced, the contour of the photoelectric image is preserved completely, and then the more accurate segmentation results are obtained.

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Zhang, Yingying, Shuiqing Xu, Zhiwei Chen, Xiang Li, Bingbing Dong, Qiwu Luo, Bing Li, and Yiyang He. "Realisation of DC/DC high power and large current combined power supply for airborne radar." Journal of Engineering 2019, no. 16 (March 1, 2019): 1930–33. http://dx.doi.org/10.1049/joe.2018.8743.

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Pohl, Nils, Herbert Knapp, Christian Bredendiek, and Rudolf Lachner. "Next generation integrated SiGe mm-wave circuits for automotive radar sensors." International Journal of Microwave and Wireless Technologies 5, no. 1 (January 4, 2013): 43–48. http://dx.doi.org/10.1017/s1759078712000736.

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In this paper, radar transmitter circuits for next generation automotive radar sensors are presented. A 79 GHz radar transmitter with an output power of 14.5 dBm consuming only 165 mA (including frequency dividers) from a 3.3 V supply voltage clearly shows the advantage of using an improved SiGe technology with an fmax of 380 GHz. In addition, two radar transmitters for higher frequencies (around 150 GHz) based on frequency doubler circuits are showing the potential of SiGe technologies. The first transmitter achieves an output power of 3 dBm (single ended) at 144 GHz, whereas the second transmitters delivers a differential output power of 0 dBm at 150 GHz. Both transmitters achieve an ultra-wide tuning range of about 45 GHz.

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王, 育才. "A Power Supply System for TR Modules of Ac-tive Phased Array Radar." Open Journal of Circuits and Systems 09, no. 02 (2020): 28–34. http://dx.doi.org/10.12677/ojcs.2020.92004.

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10

Wang, C. R. "Numerical simulation and mechanical optimization of power supply assembly for missile-borne radar." IOP Conference Series: Materials Science and Engineering 392 (August 3, 2018): 062059. http://dx.doi.org/10.1088/1757-899x/392/6/062059.

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Papastergiou, Konstantinos D., and D. Ewen Macpherson. "An Airborne Radar Power Supply With Contactless Transfer of Energy—Part II: Converter Design." IEEE Transactions on Industrial Electronics 54, no. 5 (October 2007): 2885–93. http://dx.doi.org/10.1109/tie.2007.901370.

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Papastergiou, K. D., and D. E. Macpherson. "An Airborne Radar Power Supply With Contactless Transfer of Energy—Part I: Rotating Transformer." IEEE Transactions on Industrial Electronics 54, no. 5 (October 2007): 2874–84. http://dx.doi.org/10.1109/tie.2007.902044.

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13

Battaglia, Brian, Dave Rice, Phuong Le, Bishnu Gogoi, Mike Purchine, Robert Davies, Walt Wright, et al. "A rugged 100 W high-voltage vertical MOSFET L-band radar device." International Journal of Microwave and Wireless Technologies 1, no. 4 (June 19, 2009): 277–84. http://dx.doi.org/10.1017/s1759078709990298.

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The silicon vertical MOSFET RF power amplifier described in this paper is the industry’s first to utilize high-voltage vertical technology. Operating under pulse conditions of 200 µs pulse width and 10% duty cycle, it delivers more than 100 W of peak power. Operating in Class AB with only 50 mA of bias current the device achieves more than 20 dB of gain and 47% power added efficiency at P1dB compression across 200 MHz of bandwidth at L-band from 1.2 to 1.4 GHz. The DC characteristics include a BVdss of 95 V enabling high-voltage operation with a 48 V power supply. The device is inherently rugged and withstands mismatch tolerances of 20:1 voltage standing wave ratio over all phase angles at full rated power and with 3 dB of input power over-drive and 10% greater than nominal voltage.

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Zhang, Peng, You Hua Ding, and Han Ao Xia. "The Design of Dynamic Target Echo Intermediate-Frequency Signal Source of Radar." Applied Mechanics and Materials 644-650 (September 2014): 4278–82. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.4278.

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The dynamic target echo intermediate-frequency signal source can be used to detecting and repairing receiving system, signal processing system, display system of conventional radar. The output frequency which conducted by the signal source can be adjusted. The range of output signal frequency basically covers different types of radar, which has important practical application value on the maintenance of radar. The dynamic target echo intermediate-frequency signal source is make up of source processing unit, intermediate-frequency unit, monitoring unit, the time reference source, input and output driver board and power supply pulse generation. Pulse processing unit in the signal source is in the core status.

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Zhang, Zhong Hua, Wei Wang, and Peng Zhang. "Research and Development of Radar Combined Teaching Platform." Advanced Materials Research 791-793 (September 2013): 1756–59. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.1756.

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Currently,the problem of lack of radar teaching equipment is more and more prominent because of the large number of student in teaching of the large electronic equipment. For the problem, this paper firstly elaborated the overall structure, hardware structure, software design idea of building of the radar combined teaching platform taking a certain type of radar combined teaching platform in which a cell design and development as an example. Then the paper finished the function test of the power supply module and signal module.At last, the paper showed the application effect in teaching, proved that the platform can enhance the equipment efficiency greatly and laid a good foundation the educational reform.

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Sickinger, Frank, Ernst Weissbrodt, and Martin Vossiek. "76–81 GHz LTCC antenna for an automotive miniature radar frontend." International Journal of Microwave and Wireless Technologies 10, no. 5-6 (June 2018): 729–36. http://dx.doi.org/10.1017/s1759078718000855.

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AbstractFor a fully 360° detection around a vehicle, novel automotive radar system concepts consist of up to eight radar sensors. The existing sensor-mounting areas, such as front grill or bumper corners would no longer be sufficient. Therefore, additional mounting positions such as B-pillars and side skirts have to be considered, where the radar can observe the side area of the vehicle. However, these new mounting positions usually offer significantly less space, than the established mounting areas. The solution is, to build separate miniature radar frontends that can be placed all over the vehicle and are connected to one central signal processing and power supply unit. Investigations for a miniature radar frontend have been done, based on RF360 low loss non-shrinkage low-temperature cofired ceramic (LTCC) substrate. For the automotive radar band (76–81 GHz), an array antenna has been simulated, manufactured, and the radiation pattern has been measured. A first sensor with a miniature radar frontend based on an LTCC multilayer has been designed and manufactured.

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Zhang, Zhong Hua, Jie Wei, and Han Fu. "Design of Detection and Maintenance Platform for Radar Operation Unit Based on PC104." Advanced Materials Research 988 (July 2014): 706–9. http://dx.doi.org/10.4028/www.scientific.net/amr.988.706.

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Recently,the problem of lack of radar teaching equipment is more and more prominent because of the large number of student in teaching of the large electronic equipment.For the problem,this paper firstly elaborated the hardware structure,overall structure, software design idea of the detection and maintenance platform for radar operation unit based on PC104.Then the paper finished the function test of the power supply module and signal module.At last, the paper showed the application effect in teaching, proved that the platform can enhance the equipment efficiency greatly and laid a good foundation for the teaching reform.

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18

Parisi, Alessandro, Giuseppe Papotto, Egidio Ragonese, and Giuseppe Palmisano. "A 1-V 7th-Order SC Low-Pass Filter for 77-GHz Automotive Radar in 28-nm FD-SOI CMOS." Electronics 10, no. 12 (June 18, 2021): 1466. http://dx.doi.org/10.3390/electronics10121466.

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This paper presents a switched capacitor low-pass filter in a 28-nm fully depleted silicon on insulator CMOS technology for 77-GHz automotive radar applications. It is operated at a power supply as low as 1 V and guarantees 5-dB in-band voltage gain while providing out-of-band attenuation higher than 36 dB and a programmable passband up to 30 MHz. A double sampling technique is adopted, which allows high operating frequency to be achieved while saving power. Moreover, low-voltage biasing and common-mode feedback circuits are exploited to guarantee an almost rail-to-rail output voltage swing. The proposed filter provides an output 1-dB compression point as high as 8.7 dBm with a power consumption of 9 mW. To the authors’ knowledge, this is the first SC-based implementation of a low pass filter for automotive radar applications.

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Oh, Kwang-Il, Goo-Han Ko, Jeong-Geun Kim, and Donghyun Baek. "An 18.8–33.9 GHz, 2.26 mW Current-Reuse Injection-Locked Frequency Divider for Radar Sensor Applications." Sensors 21, no. 7 (April 6, 2021): 2551. http://dx.doi.org/10.3390/s21072551.

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An 18.8–33.9 GHz, 2.26 mW current-reuse (CR) injection-locked frequency divider (ILFD) for radar sensor applications is presented in this paper. A fourth-order resonator is designed using a transformer with a distributed inductor for wideband operating of the ILFD. The CR core is employed to reduce the power consumption compared to conventional cross-coupled pair ILFDs. The targeted input center frequency is 24 GHz for radar application. The self-oscillated frequency of the proposed CR-ILFD is 14.08 GHz. The input frequency locking range is from 18.8 to 33.8 GHz (57%) at an injection power of 0 dBm without a capacitor bank or varactors. The proposed CR-ILFD consumes 2.26 mW of power from a 1 V supply voltage. The entire die size is 0.75 mm × 0.45 mm. This CR-ILFD is implemented in a 65 nm complementary metal-oxide semiconductor (CMOS) technology.

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Cavarra, Andrea, Giuseppe Papotto, Alessandro Parisi, Alessandro Finocchiaro, Claudio Nocera, and Giuseppe Palmisano. "Transformer-Based VCO for W-Band Automotive Radar Applications." Electronics 10, no. 5 (February 25, 2021): 531. http://dx.doi.org/10.3390/electronics10050531.

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A transformer-based voltage-controlled oscillator for a W-band frequency-modulated continuous-wave (FMCW) automotive radar application is presented. The design challenges imposed by the millimeter-wave frequency operation were faced through a circuit and layout co-design approach, supported by extensive electromagnetic simulations and accurate analysis of both the start-up condition and the tank quality factor. The oscillator was implemented in a 28-nm fully depleted silicon-on-insulator (SOI) complementary metal–oxide–semiconductor (CMOS) technology. It provided a 37 GHz oscillation frequency with a variation of around 4 GHz, thus achieving a tuning range of 11%. Moreover, a 77 GHz output signal was also delivered, which was extracted as a second harmonic from the input-pair common-mode node. The circuit exhibited low phase noises, whose average performances were −97 dBc/Hz and −121 dBc/Hz at 1 MHz and 10 MHz offset frequencies, respectively. It delivered a 77-GHz output power of −10.5 dBm and dissipated 26 mW with a 1 V power supply. The silicon area occupation was 300 × 135 µm.

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Xia, Xinfan, Lihua Liu, Shengbo Ye, Hongfei Guan, and Guangyou Fang. "A Novel Subnanosecond Monocycle Pulse Generator for UWB Radar Applications." Journal of Sensors 2014 (2014): 1–4. http://dx.doi.org/10.1155/2014/150549.

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A novel ultra-wideband (UWB) monocycle pulse generator with good performance is designed and demonstrated in this paper. It contains a power supply circuit, a pulse drive circuit, a unique pulse forming circuit, and a novel monopolar-to-monocycle pulse transition circuit. The drive circuit employs wideband bipolar junction transistors (BJTs) and linear power amplifier transistor to produce a high amplitude drive pulse, and the pulse forming circuit uses the transition characteristics of step recovery diode (SRD) effectively to produce a negative narrow pulse. At last, the monocycle pulse forming circuit utilizes a novel inductanceLshort-circuited stub to generate the monocycle pulse directly. Measurement results show that the waveform of the generated monocycle pulses is over 76 V in peak-to-peak amplitude and 3.2 ns in pulse full-width. These characteristics of the monocycle pulse are advantageous for obtaining long detection range and high resolution, when it is applied to ultra-wideband radar applications.

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Sakalas, Mantas, Niko Joram, and Frank Ellinger. "A 1.5–40 GHz frequency modulated continuous wave radar receiver front-end." International Journal of Microwave and Wireless Technologies 13, no. 6 (February 18, 2021): 532–42. http://dx.doi.org/10.1017/s1759078721000118.

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AbstractThis study presents an ultra-wideband receiver front-end, designed for a reconfigurable frequency modulated continuous wave radar in a 130 nm SiGe BiCMOS technology. A variety of innovative circuit components and design techniques were employed to achieve the ultra-wide bandwidth, low noise figure (NF), good linearity, and circuit ruggedness to high input power levels. The designed front-end is capable of achieving 1.5–40 GHz bandwidth, 30 dB conversion gain, a double sideband NF of 6–10.7 dB, input return loss better than 7.5 dB and an input referred 1 dB compression point of −23 dBm. The front-end withstands continuous wave power levels of at least 25 and 20 dBm at low band and high band inputs respectively. At 3 V supply voltage, the DC power consumption amounts to 302 mW when the low band is active and 352 mW for the high band case, whereas the total IC size is $3.08\, {\rm nm{^2}}$.

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Malajner, Marko, Danijel Šipoš, and Dušan Gleich. "Design of a Low-Cost Ultra-Wide-Band Radar Platform." Sensors 20, no. 10 (May 18, 2020): 2867. http://dx.doi.org/10.3390/s20102867.

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This paper proposes an improved design of a pulse-based radar. An improved design of a pulse generator is presented using step recovery diodes and a signal mixer for the received signal. Two-step recovery diodes produce pulses of 120 ps in duration. A pulse generator is improved by removing the negative power supply, resulting in a reduced number of electronic pulses. A sampling mixer at the receiver’s site receives the generated signal and stretches it from picoseconds into microseconds. The improved pulse generator is also used in the sampling mixer as a strobe pulse generator, which makes the sampling mixer much simpler. The stretched signal is then sampled by a low sample rate using an analog to digital converter. The proposed radar design achieves up to 8 GHz bandwidth and an equivalent receiving sample rate of about 100 GSa/s. The radar is controlled using a software-defined radio called Red Pitaya, which is also used for data acquisition. The proposed radar design uses widely available commercial components, which makes radar design widely available with low cost implementation.

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Yoon, Min, and Jee-Youl Ryu. "Development of Low-Noise Small-Area 24 GHz CMOS Radar Sensor." Journal of Sensors 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/8534198.

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We present a low-noise small-area 24 GHz CMOS radar sensor for automotive collision avoidance. This sensor is based on direct-conversion pulsed-radar architecture. The proposed circuit is implemented using TSMC 0.13 μm RF (radio frequency) CMOS (fT/fmax=120/140 GHz) technology, and it is powered by a 1.5 V supply. This circuit uses transmission lines to reduce total chip size instead of real bulky inductors for input and output impedance matching. The layout techniques for RF are used to reduce parasitic capacitance at the band of 24 GHz. The proposed sensor has low cost and low power dissipation since it is realized using CMOS process. The proposed sensor showed the lowest noise figure of 2.9 dB and the highest conversion gain of 40.2 dB as compared to recently reported research results. It also showed small chip size of 0.56 mm2, low power dissipation of 39.5 mW, and wide operating temperature range of −40 to +125°C.

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Mikhalap, Sergei, Sergei Trashenkov, and Vera Vasilyeva. "STUDY OF OVERHEAD POWER LINE CORRIDORS ON THE TERRITORY OF PSKOV REGION (RUSSIA) BASED ON SATELLITE SOUNDING DATA." ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 20, 2019): 164. http://dx.doi.org/10.17770/etr2019vol1.4087.

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Overhead power lines (OPL) form the basis of a power grid. Reliable energy supply depends on no-failure operation of these long-length elements of energy infrastructure. More than 12,000 km out of 45,000 km of OPL in Pskov region (Russia) pass through forests. This study investigates the possibilities of using satellite-sensing data to assess the conditions of corridors for OPL with different voltage levels. Authors evaluated compliance of actual data with requirements of national standards. The dynamics of vegetation and local topography based on synthetic aperture radar data and multispectral images were taken into account.

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Budnyaev, Vadim, and Valeriy Vertegel. "A SiGe 3-stage LNA for automotive radar application from 76 to 81 GHz." ITM Web of Conferences 30 (2019): 01004. http://dx.doi.org/10.1051/itmconf/20193001004.

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This paper presents the simulation results of the W-band 3-stage low noise amplifier which is designed in 0.13 μm SiGe BiCMOS technology. The LNA achieves a peak S21 of 24.1 dB and noise figure of 6 dB at 80 GHz with 3 dB bandwidth of 14 GHz from 73 to 87 GHz. S11 is better than 11 dB. The simulated input 1 dB compression point is –23 dBm at 80 GHz with low power consumption of 26 mW from 1.2 V voltage supply. Layout area is 0.36 mm2.

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Lazaro, Antonio, Marc Lazaro, Ramon Villarino, David Girbau, and Pedro de Paco. "Car2Car Communication Using a Modulated Backscatter and Automotive FMCW Radar." Sensors 21, no. 11 (May 24, 2021): 3656. http://dx.doi.org/10.3390/s21113656.

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This work proposes the use of a modulated tag for direct communication between two vehicles using as a carrier the wave emitted by an FMCW radar installed in the vehicle for advanced driver assistance. The system allows for real-time signals detection and classification, such as stop signal, turn signals and emergency lights, adding redundancy to computer video sensors and without incorporating additional communication systems. A proof-of-concept tag has been designed at the microwave frequency of 24 GHz, consisting of an amplifier connected between receiving and transmitting antennas. The modulation is performed by switching the power supply of the amplifier. The tag is installed on the rear of the car and it answers when it is illuminated by the radar by modulating the backscattered field. The information is encoded in the modulation switching rate used. Simulated and experimental results are given showing the feasibility of the proposed solution.

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Schoepfel, Jan, Simon Kueppers, Klaus Aufinger, and Nils Pohl. "A SiGe transceiver chipset for automotive radar applications using wideband modulation sequences." International Journal of Microwave and Wireless Technologies 11, no. 7 (May 31, 2019): 676–85. http://dx.doi.org/10.1017/s1759078719000849.

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AbstractThis paper presents a W-band MIMO radar transceiver chipset for automotive applications, based on a Silicon Germanium technology. It consists of a reference VCO, operating at a center frequency of 38 GHz and a companion IC that comprises a complete millimeter-wave transceiver at 76 GHz. This chipset enables building multipurpose MIMO radar systems that can be scaled in terms of transmitter and receiver count. What makes this system innovative is the fact that it is able to handle more broadband signals than systems presented in current literature and is furthermore not limited to one modulation scheme. The chipset is capable of transmitting and receiving any signal waveform. The main goal of this work was to create a functional version of a VCO and a one-channel transceiver MMIC. Furthermore a demonstrator for a proof of concept was designed to test the MMICs on a system level. The realized VCO MMIC achieves a tuning frequency range of 6 GHz with a center frequency of 38 GHz and consumes 152 mW from a 3.3 V supply. The transceiver MMIC is fully functional and achieves a saturated output power of 11.5 dBm while drawing 670 mW from a 3.3 V supply.

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Furqan, Muhammad, Faisal Ahmed, Reinhard Feger, Klaus Aufinger, Walter Hartner, and Andreas Stelzer. "A SiGe-based fully-integrated 122-GHz FMCW radar sensor in an eWLB package." International Journal of Microwave and Wireless Technologies 9, no. 6 (February 10, 2017): 1219–30. http://dx.doi.org/10.1017/s1759078717000095.

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High-performance SiGe HBTs and advancements in packaging processes have enabled system-in-package (SiP) designs for millimeter-wave applications. This paper presents a 122-GHz bistatic frequency modulated continuous wave (FMCW) radar SiP. The intended applications for the SiP are short-range distance and angular position measurements as well as communication links between cooperative radar stations. The chip is realized in a 130-nm SiGe BiCMOS technology and is based on a fully differential frequency-multiplier chain with in phase quadrature phase receiver and a binary phase shift keying modulator in the transmit chain. On-wafer measurement results show a maximum transmit output power of 2.7 dBm and a receiver gain of 11 dB. The chip consumes a DC power of 570 mW at a supply voltage of 3.3 V. The fabricated chip is integrated in an embedded wafer level ball grid array (eWLB) package. Transmit/receive rhombic antenna arrays with eight elements are designed in two eWLB packages with and without backside metal, with a measured peak gain of 11 dBi. The transceiver chip size is 1.8 mm × 2 mm, while the package size is 12 mm × 6 mm, respectively. FMCW measurements have been conducted with a sweep bandwidth of up to 17 GHz and a measured range resolution of 1.5 cm has been demonstrated. 2D positions of multiple targets have been computed using two coherently linked radar stations.

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Li, Wan Ling, Xiang Jun Song, and Yan Chen. "Research on Prognostic Method Based on SVR Optimized by Improved QPSO." Applied Mechanics and Materials 513-517 (February 2014): 1653–59. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.1653.

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Prognostic capability is a very important character for PHM distinguishing from other diagnosis systems, fault prognostic method based on SVR was researched on in this paper. In order to solve kernel function parameters, penalty coefficient and insensitivity loss coefficient of SVR, improved QPSO was put forward to train SVR in this paper. And then a certain power supply combination in beam control system of a certain control and guide radar was taken as an example to collect voltage signal and forecasted, and its precision was very perfect and could satisfy prognostic demand.

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Danufane, Fadil Habibi, Arief Nur Rahman, and Eko Joni Pristianto. "Design of Automated PC Shutdown Control System in Coastal/LPI Radar System Based on Microcontroller ATMega8L." Jurnal Elektronika dan Telekomunikasi 16, no. 2 (December 20, 2016): 59. http://dx.doi.org/10.14203/jet.v16.59-64.

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One consideration during the design of long range controlled electrical system is the sudden outage of a Personal Computer (PC) caused by power failure. Frequent outage can damage the components inside the PC such that the whole system could be malfunction. This can affect the cost, time, and effort required to fix the system. Usually such system is equipped with a temporary power storage or UPS (uninterruptible power supply) with a small capacity, so the PC in the system can immediately be turned off before the UPS runs out. Therefore it is necessary to design a control system that can shutdown the PC automatically within a certain range of time after the outage. The implementation of designed system has used an ATmega8L microcontroller as a controller, an optoisolator PS2505-1 as isolator for electric components from AC signal, and Visual Basic as the programming language. The system has been tested with an input voltage of 220Vrms AC signal. The test result has shown that the PC was successfully shut down within a certain time range after the input was terminated.

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Putri, Bidadariana Yunia Utami, Eka Setia Nugraha, Anantia Prakasa, and Subroto Fajar Siddiq. "Design and Performance Analysis of Linear Array Microstrip Antennas with Mitered-Bends Feeding Network for X-Band Radar Applications." Jurnal Elektronika dan Telekomunikasi 20, no. 1 (August 31, 2020): 9. http://dx.doi.org/10.14203/jet.v20.9-15.

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To accurately detect objects, the radar antenna must have a high gain for the desired range. The antenna uses an array method to increase the gain. It has a unidirectional radiation pattern to meet the X-band radar implementation as a ship navigation tool. The X-band radar works at high frequencies. Thus, it will be more sensitive in detecting small particles, including rain particles. The use of a mitered-bends feeding network method by cutting the 90-degree curve is to maximize the power transmitted to reduce losses. This method spreads the bandwidth of the antenna. The antenna is designed and fabricated into a linear array of 8 elements, using the R04003C Rogers substrate with a microstrip line supply. This study limits up to 8 elements of radiation, followed by the addition of a method to expand the bandwidth of antennas. Considering material limitation and duration of antenna design. The final antenna dimensions are 142.40 mm × 42.8 mm. The measuring results show fc = 9.496 GHz, S11 = -32.64 dB, VSWR 1.05, bandwidth = 41.9 MHz (9.5159 GHz - 9.4740 GHz), and gain 8.8 dB as well as a linear polarized antenna with unidirectional pattern direction. The radar antenna tends to have a narrow beamwidth and high gain.

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Li, Wan Ling, Yan Hong Liu, and Xiang Jun Song. "Research on Combination Prognostic Method Based on LS-SVM." Advanced Materials Research 756-759 (September 2013): 4016–20. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.4016.

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Prognostic capability is a very important character for PHM distinguishing from other diagnosis systems, and fault prognostic method based on LS-SVM was researched on in this paper. In order to solve kernel function parameters, penalty coefficient and insensitivity loss coefficient of LS-SVM, improved QPSO was put forward to train LS-SVM in this paper. And then a certain power supply combination in beam control system of a certain control and guide radar was taken as an example to collect voltage signal and forecasted, and its precision was very perfect and could satisfy prognostic demand.

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Cheng, Guoxiao, Zhiqun Li, Zhennan Li, Zengqi Wang, and Meng Zhang. "A Highly-Integrated, Switchless and Baluns-Embedded Transceiver with a Differential Structure for C-Band Radar Application." Journal of Circuits, Systems and Computers 29, no. 10 (December 9, 2019): 2050160. http://dx.doi.org/10.1142/s0218126620501601.

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This paper presents a highly-integrated transceiver with a differential structure for C-band (5–6[Formula: see text]GHz) radar application using a switchless and baluns-embedded configuration. To reduce the noise figure (NF) in receiver (Rx) mode and enhance the output power in transmitter (Tx) mode, the balun at RF port is embedded into the low-noise amplifier (LNA) and the power amplifier (PA), respectively. Besides, the RF switch is removed by designing the matching networks that both LNA and PA can share. The same topology is also adopted at the IF port. To achieve a high image rejection ratio (IRR), a Hartley architecture using polyphase filters (PPFs) is adopted. The proposed transceiver has been implemented in 1P6M 0.18-[Formula: see text]m CMOS process. The receiver achieves 6.9-dB NF, [Formula: see text]7.5-dBm IIP3 and 26.3-dB gain with three-step digital gain controllability. Also the measured IRR is better than 41[Formula: see text]dBc. The transmitter achieves 9.6-dBm output power and 19.2-dB gain. The chip consumes 106[Formula: see text]mA in the Rx mode and 141[Formula: see text]mA in the Tx mode from the 3.3-V power supply.

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Zaki, Ahmad, Megat Azmi Megat Johari, Wan Muhd Aminuddin Wan Hussin, and Yessi Jusman. "Experimental Assessment of Rebar Corrosion in Concrete Slab Using Ground Penetrating Radar (GPR)." International Journal of Corrosion 2018 (November 21, 2018): 1–10. http://dx.doi.org/10.1155/2018/5389829.

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Corrosion of steel reinforcement is a major cause of structural damage that requires repair or replacement. Early detection of steel corrosion can limit the extent of necessary repairs or replacements and costs associated with the rehabilitation works. The ground penetrating radar (GPR) method has been found to be a useful method for evaluating reinforcement corrosion in existing concrete structures. In this paper, GPR was utilized to assess corrosion of steel reinforcement in a concrete slab. A technique for accelerating reinforcement bar corrosion using direct current (DC) power supply with 5% sodium chloride (NaCl) solution was used to induce corrosion to embedded reinforcement bars (rebars) in this concrete slab. A 2 GHz GPR was used to assess the corrosion of the rebars. The analysis of the results of the GPR data obtained shows that corrosion of the rebars could be effectively localized and assessed.

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Mingo, Laurent, Gwenn E. Flowers, Anna J. Crawford, Derek R. Mueller, and David G. Bigelow. "A stationary impulse-radar system for autonomous deployment in cold and temperate environments." Annals of Glaciology 61, no. 81 (February 17, 2020): 99–107. http://dx.doi.org/10.1017/aog.2020.2.

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AbstractStationary ice-penetrating radar (sIPR) systems can be used to monitor temporal changes in electromagnetically sensitive properties of glaciers and ice sheets. We describe a system intended for autonomous operation in remote glacial environments, and document its performance during deployments in cold and temperate settings. The design is patterned after an existing impulse radar system, with the addition of a fibre-optic link and timing module to control transmitter pulses, a micro-UPS (uninterruptable power supply) to prevent uncontrolled system shutdown and a customized satellite telemetry scheme. Various implementations of the sIPR were deployed on the Kaskawulsh Glacier near an ice-marginal lake in Yukon, Canada, for 44–77 days in summers 2014, 2015 and 2017. Pronounced perturbations to englacial radiostratigraphy were observed commensurate with lake filling and drainage, and are interpreted as changes in englacial water storage. Another sIPR was deployed in 2015–2016 on ice island PII-A-1-f, which originated from the Petermann Glacier in northwest Greenland. This system operated autonomously for almost a year during which changes in thickness of the ice column were clearly detected.

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Mulyana, Erwin. "OBSERVASI PERTUMBUHAN AWAN DI DAS MAMASA SULAWESI BARAT DENGAN RADAR CUACA." Jurnal Sains & Teknologi Modifikasi Cuaca 12, no. 2 (December 18, 2011): 49. http://dx.doi.org/10.29122/jstmc.v12i2.2190.

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Telah dilakukan pengamatan awan di DAS Mamasa berdasarkan data X-band Mobile Radar untuk mengetahui karakteristik pertumbuhan awan di daerah tersebut. Pengamatan awan dilakukan pada saat kegiatan penyemaian awan tangal 21 Oktober - 19 November 2009. Hasil pengamatan menunjukkan bahwa pertumbuhan awan di DAS Mamasa dipengaruhi oleh proses orografik dan arah angin. Pada saat angin baratan, pertumbuhan awan terkonsentrasi di sisi bagian barat DAS Mamasa. Sebaliknya, pertumbuhan awan terkonsentrasi di sisi bagian timur DAS Mamasa ketika terjadi angin timuran.Study on the characteristic of cloud development at Mamasa catchment area is very important since the water supply for Bakaru hydro-electric power is highly depend on the rain fall over this area. During rain enhancement project on 21 October to 19 November 2009, convective clouds have been analized based on X-band mobile weather radar observation over Mamasa River catchment area. The observation result shows that cloud development in this area are influenced by orographic processes and wind direction. During westerly wind, the clouds developed over the western part of catchment area. On the contrary, the clouds were observed over the east side of cathment area during easterly wind.

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Eissa, M. H., A. Malignaggi, M. Ko, K. Schmalz, J. Borngräber, A. C. Ulusoy, and D. Kissinger. "A 216–256 GHz fully differential frequency multiplier-by-8 chain with 0 dBm output power." International Journal of Microwave and Wireless Technologies 10, no. 5-6 (March 5, 2018): 562–69. http://dx.doi.org/10.1017/s1759078718000235.

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AbstractThis work presents a fully differential wideband and low power 240 GHz multiplier-by-8 chain, manufactured in IHP's 130 nm SiGe:C BiCMOS technology with fT/fmax = 300/500 GHz. A single ended 30 GHz input signal is multiplied by 8 using Gilbert cell-based quadrupler and doubler, and then amplified with a wideband differential 3-stage cascode amplifier. To achieve wide bandwidth and optimize for power consumption, the power budget has been designed in order to operate the frequency multipliers and the output amplifier in saturation. With this architecture the presented circuit achieves a 3 dB bandwidth of 40 GHz, meaning a relative 3 dB bandwidth of 17%, and a peak saturated output power of 0 dBm. Harmonic rejections better than 25 dB were measured for the 5th, 6th, and 7th harmonics. It dissipates 255 mW from 3 V supply which results in drain efficiency of 0.4%, while occupying 1.2 mm2. With these characteristics the presented circuit suits very well as a frequency multiplier chain for driving balanced mixers in 240 GHz transceivers for radar, communication, and sensing applications.

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Peng, B., R. Nan, T. Piao, D. Jiang, Y. Su, R. G. Strom, S. Wu, X. Zhang, L. Zhu, and X. Liu. "Radio Interference in Astronomical Observatories of China." Symposium - International Astronomical Union 196 (2001): 307–10. http://dx.doi.org/10.1017/s0074180900164277.

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We first very briefly introduce the major radio facilities for astronomical research in China, and then report on the present interference situation at major radio observatories. Some of the radio interference problems are caused by paging services, mobile phone satellites, telemetry services for power supply, waterpower and earthquake activity, or radar systems, but some causes are unknown. In the worst case, harmful to radio astronomy, the Sesan VLBI station has not been able to do any observations at 92 cm due to serious radio interference problems since 1992. Still more serious interference coming from satellites can be expected in the next decade. International efforts on frequency protection should be urgently pursued if ground-based radio astronomy is to survive.

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Tsaliev, T. A., and A. O. Vakarchuk. "CHARACTERISTICS OF VIBRATOR ARRAYS DIRECTIVITY ON HARMONICS OF MAIN FREQUENCY." Proceedings of the O.S. Popov ОNAT 1, no. 2 (December 31, 2020): 40–49. http://dx.doi.org/10.33243/2518-7139-2020-1-2-40-49.

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Antenna patterns representing dependences of the directivity factor (DF) on angular coordinates for arrays formed from Yagi-Uda aerials are considered and discussed. The results of computer modelling are based on the decision of integral equations by the method of moments. Patterns that represent dependences of the coefficient of the directivity factor (DF) for an array and her elements from angular coordinates are counted on fundamental frequency and four harmonics. The data obtained confirmed the validity of the assumptions that the directivity properties of vibrator antenna arrays can significantly affect the EMC conditions for harmonics of the fundamental frequency. At these frequencies, several main maxima appear in the radiation patterns, the level of directivity in which may even exceed the maximum directivity in the main lobe at the fundamental frequency. The DF patterns shown in the article refer to the case of in-phase excitation of the active elements of the array (without supply lines). However, in the presence of such lines with sequential or mixed power supply circuits, the dependence of the directivity on the angular coordinates can change significantly. The presence of bandpass filters in the input and output stages of the radar will make it possible to largely suppress the levels of harmonic interference, however, if these filters are made on the basis of transmission line segments, their parameters at harmonic frequencies may be insufficient. Further research can be aimed at studying the spatial characteristics and directivity of vibrator antenna arrays based on wave channel antennas with an increased number of passive vibrators, as well as with various power supply and filtering schemes.

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Ghebreyesus, Dawit, and Hatim O. Sharif. "Spatio-Temporal Analysis of Precipitation Frequency in Texas Using High-Resolution Radar Products." Water 12, no. 5 (May 13, 2020): 1378. http://dx.doi.org/10.3390/w12051378.

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Understanding the frequency and intensity of precipitation is needed for many vital applications including water supply for agricultural, municipal, industrial, and power generation uses, design of hydraulic structures, and analysis and forecasting of hazards such as flood, drought, and landslide. This study examines, in detail, the spatial and temporal variability of precipitation frequency over the State of Texas and its trends from 2002 to 2019. The results indicate that Texas receives around 325 wet hours on average annually (3.7% of the time). The northern part of the Gulf Coast region witnesses the highest average precipitation frequency reaching 876 wet hours annually. The year 2015 was found to have the highest precipitation frequency across the state with an average frequency of 6% (525 wet hours) and 2011 was the driest, with an average frequency of 1.9% (170 wet hours). In terms of seasonality, the highest precipitation frequency was observed in the summer with a frequency of 4.1%. The areal average time-series of the precipitation frequency indicates that the 2011–2012 drought to be a change point. The Mann–Kendall trend analysis shows that 16.2% of the state experienced a significant positive trend in precipitation frequency including the dry western region and major cities. The results can provide useful information about storm characteristics and recent change and variability of precipitation at high spatial resolutions and can be used in a multitude of practical applications.

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Issakov, Vadim, Johannes Rimmelspacher, Saverio Trotta, Marc Tiebout, Amelie Hagelauer, and Robert Weigel. "A 52-to-67 GHz dual-core push–push VCO in 40-nm CMOS." International Journal of Microwave and Wireless Technologies 10, no. 7 (February 12, 2018): 783–93. http://dx.doi.org/10.1017/s1759078718000077.

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AbstractWe present a continuously tunable 52-to-67 GHz push–push dual-core voltage-controlled oscillator (VCO) in a 40 nm bulk complementary metal–oxide–semiconductor (CMOS) technology. The circuit is suitable for 60 GHz frequency-modulated-continuous-wave radar applications requiring a continuously tunable ultra-wide modulation bandwidth. The LC-tank inductor is used to couple the two VCO cores. The fundamental frequency of the VCO can be tuned from 26 to 33.5 GHz, which corresponds to a frequency tuning range of 25%. The second harmonic is extracted in a non-invasive way using a transformer. The primary side acts simultaneously as a second harmonic filter. The VCO achieves in measurement a low phase noise of −91.8 dBc/Hz at 1 MHz offset at 62 GHz and an output power of −20 dBm. The VCO including buffers dissipates in the dual-core operation mode 60 mA from a single 1.1 V supply and consumes a chip area of 0.58 mm2.

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Maiellaro, Giorgio, Giovanni Caruso, Salvatore Scaccianoce, Mauro Giacomini, and Angelo Scuderi. "40 GHz VCO and Frequency Divider in 28 nm FD-SOI CMOS Technology for Automotive Radar Sensors." Electronics 10, no. 17 (August 31, 2021): 2114. http://dx.doi.org/10.3390/electronics10172114.

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This paper presents a 40 GHz voltage-controlled oscillator (VCO) and frequency divider chain fabricated in STMicroelectronics 28 nm ultrathin body and box (UTBB) fully depleted silicon-on-insulator (FD-SOI) complementary metal-oxide–semiconductor (CMOS) process with eight metal layers back-end-of-line (BEOL) option. VCOs architecture is based on an LC-tank with p-type metal-oxide–semiconductor (PMOS) cross-coupled transistors. VCOs exhibit a tuning range (TR) of 3.5 GHz by exploiting two continuous frequency tuning bands selectable via a single control bit. The measured phase noise (PN) at 38 GHz carrier frequency is −94.3 and −118 dBc/Hz at 1 and 10 MHz frequency offset, respectively. The high-frequency dividers, from 40 to 5 GHz, are made using three static CMOS current-mode logic (CML) Master-Slave D-type Flip-Flop stages. The whole divider factor is 2048. A CMOS toggle flip-flop architecture working at 5 GHz was adopted for low frequency dividers. The power dissipation of the VCO core and frequency divider chain are 18 and 27.8 mW from 1.8 and 1 V supply voltages, respectively. Circuit functionality and performance were proved at three junction temperatures (i.e., −40, 25, and 125 °C) using a thermal chamber.

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He, Qichang, Shiguang Qiu, Xiumin Fan, and Keyan Liu. "An interactive virtual lighting maintenance environment for human factors evaluation." Assembly Automation 36, no. 1 (February 1, 2016): 1–11. http://dx.doi.org/10.1108/aa-04-2015-029.

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Purpose – The paper aims to establish a virtual lighting maintenance environment (VLME), and to analyze the visibility-related human factors (HFs) during maintenance operations through interactive simulations. Design/methodology/approach – First, an accurate task lighting modeling method was developed, which includes lighting information modeling and illuminant parameters calibration. Then, the real-time interaction between the task lighting and three-dimensional virtual human was modeled. After that, the attenuation coefficient of visibility was determined. Also, the HFs’ analysis process in VLME was described in detail. Findings – A case study of power supply module replacement of radar equipment was performed in VLME. The HFs’ analysis demonstrated that the task lighting significantly affects the visibility, which causes indirect impact on posture comfort and operation safety. Practical implications – Through evaluating maintenance operation processing in lighting environment, engineers can better analyze and validate the maintainability design for complex equipment, and some potential ergonomics and safety issues can be found and dealt earlier. Originality/value – An VLME was built for interactive “human-in-loop” maintenance operation simulation, which can support HFs’ evaluation in lighting environment accurately and effectively.

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Шмырев, В. Ф., and А. Д. Донец. "МЕТОД ОПТИМІЗАЦІЇ ПРИ ПРОЕКТУВАННІ ПОВІТРЯНИХ РОЗПОДІЛЬНИХ МЕРЕЖ ЕНЕРГЕТИЧНИХ СИСТЕМ ЛІТАКА." Open Information and Computer Integrated Technologies, no. 85 (July 29, 2019): 119–35. http://dx.doi.org/10.32620/oikit.2019.85.07.

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Augmentation of the flight range, speed and altitude along with the extension of the number of missions accomplished by aircraft has resulted in the expansion and complication of the functions performed by the aircraft air distribution systems. Thus, for instance, the air distribution system of a modern transport airplane includes:- cabin air conditioning system;- underfloor area heating system;- wing ice protection and fuel tank venting system; - engine air intake ice protection system;- engine pneumatic starting system;- the system of controlled air extraction from the equipment/avionics compartment;- hydraulic tank pressurization system;- turbine-driven hydraulic pump drive;- radio equipment and radar pressurization system; - auxiliary power unit compartment heating system;- cabins air conditioning using ground sources;- cabins ventilation using atmospheric air;- air supply for inert gas generation In terms of structure design the aircraft air systems are a complex of heat exchange mechanisms, cooling turbines, compressors, filters, limiters and regulators, mixers, pipelines and other components interacting with each other and with the environment through the exchange of the flows of working media, heat and mechanical energy. The system purpose is implemented in the process of its functioning which implies on-board generation of working medium and its supply to consumers with the quantity and quality of the medium conditioned by external characteristics. External characteristic is a quantification of the purpose of system functioning. As an engineering entity the air distribution systems are characterized by a number of functional indicators. These include the system reliability and weight, expenditure of energy and working medium, overall dimensions, external energy release, factor of safety, cost, etc. In the practical development of air distribution systems, when meeting the cooling performance requirements use is later made, as a general rule, of such indicator as "installation weight", less frequently – of the integrated "reduced" weight indicator with introduction of limitations on other indicators. Designing the air distribution systems involves lookup for a compromise between a number of conflicting requirements: minimization of the installation weight and energy losses, high system reliability, fail safety, rigorous geometric constraints, high manufacturability and comparatively low cost of production. Application of the mathematical statics techniques makes it possible to optimize parameters of the air system.

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Adejare, Q. A., S. A. Azeez, Q. J. Aderibigbe, and M. B. Adewara. "Bathymetry and Siltation of Oyan Dam, Ogun State, Nigeria." Nigerian Journal of Environmental Sciences and Technology 4, no. 2 (October 2020): 314–23. http://dx.doi.org/10.36263/nijest.2020.02.0208.

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Dams are reservoirs established for different reasons. Oyan dam, Ogun State, Nigeria was established and commissioned on the 29th March 1983 to supply water to Lagos State and Abeokuta for municipal uses, with power generation potentials to support Lower Ogun Irrigation Project. However, flooding has become an annual experience of downstream communities along Ogun river especially when the Oyan dam is opened; it has really becomes remarkable since the flood events of 2012. This project investigates the level of siltation and floods menace adjoining Oyan dam and its environ. An integrated methodology of bathymetric survey, total station traversing and satellite imagery were used to acquire geospatial locations of the dam features and other details within the dam through the process of traversing, heightening and detailing. The field investigation was conducted between January 2018 and January 2020 to determine dam bed topography with the deployment of integrated approach. The collected data were processed using Hydrologic Engineering Center’s River Analysis System (HEC-RAS), HYPACK software and ArcGIS 10.6 software. The maximum and minimum depth within the dam are -4.072m and -21.588m respectively. The cross sections are represented for each 200m length of the dam. Furthermore, volumetric analysis of sediment budget was computed to be 251.7x106m3 and compared with designed reservoir capacity of 270x106m3. From the study, a loss of about 18.2x106m3 approximately 6.7% was recorded. Satellite imagery shows the rate of change within Oyan dam and its catchment area downstream based on Triangulated Irregular Network (TIN) generated from Shuttle Radar Topography Mission (SRTM) the maximum and minimum elevation in the catchment are 29m and 182m respectively. The study recommends that deepen and training of Ogun river and all adjoining drainages system within the study corridor to retain more water when peak rainfall is recorded.

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Ашихмин, А. В., Ю. Г. Пастернак, В. А. Пендюрин, and Ф. С. Сафонов. "SWITCHING SCANNING ANTENNA SYSTEM BASED ON A FLAT LUNEBERG LENS WITH CONCENTRIC RINGS." ВЕСТНИК ВОРОНЕЖСКОГО ГОСУДАРСТВЕННОГО ТЕХНИЧЕСКОГО УНИВЕРСИТЕТА, no. 2 (May 11, 2021): 54–64. http://dx.doi.org/10.36622/vstu.2021.17.2.009.

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Антенные системы с возможностью широкоугольного сканирования довольно часто используются в современных системах беспроводной связи и радиолокационных системах гражданского и военного назначения. Особое внимание привлекли Smart-антенны (антенны с коммутируемым лучом и адаптивные антенные системы), а также фазированные антенные решетки (ФАР). В работе рассмотрен вариант построения ФАР с коммутационным сканированием с диаграммообразующей схемой в виде плоской линзы Люнеберга, состоящей из системы концентрических диэлектрических колец, размещенных на подложке из материала Rogers 5880. Исследованы влияние кронштейна крепления для ФАР на диаграмму направленности, уровень излучения, снижение коэффициента направленного действия и уровня сектора сканирования в азимутальной плоскости. Максимальный диаметр ФАР 160 мм, полная высота такой антенны получилась 38 мм. Запитка осуществляется при помощи коаксиальных кабелей с волновым сопротивлением 50 Ом. Диаметр самой линзы Люнеберга был выбран 80 мм; полная высота линзы мм. Подложка имеет толщину мм, склеенная слоем клея толщиной 0.025 мм. Концентрические кольца на этой подложке имеют высоту 0.787 мм. Минимальная ширина концентрического кольца (внешнего) мм (при резке УФ лазером минимальная ширина перегородки между отверстиями равна 0.05 мм). Полосковые трансформаторы расположены на плате из материала Rogers 5880 и имеют толщину равную мм Scanning antennas with wide-angle scanning capabilities are widely used in the areas such as modern wireless communications and military and civilian radars. Among them, lens antennas with switched beams and phased array antennas (PHAR) attracted considerable attention. In this paper, we consider a variant of the construction of switching scanning PHAR with a diagram-forming scheme in the form of a flat Luneberg lens consisting of a system of concentric dielectric rings placed on a substrate made of Rogers 5880 material. We studied the effect of the PHAR mounting bracket on the presence of its influence on the radiation pattern, the radiation level, the decrease in the directional coefficient, and the level of the scanning sector in the azimuth plane. The maximum diameter of the PHAR is 160 mm, the full height of this antenna is 38 mm. The power supply is carried out using coaxial cables with a wave resistance of 50 Ohms. The diameter of the Luneberg lens itself was chosen 80 mm; the full height of the lens is H =0.939 mm. The substrate has a thickness of t =0.127 mm, glued with a layer of glue, 0.025 mm thick. The concentric rings on this substrate are 0.787 mm high. Minimum width of the concentric ring (external) d - W =0.25 mm (when cutting with a UV laser, the minimum width of the partition between the holes is 0.05 mm). Strip transformers are located on the board made of Rogers 5880 material and have a thickness of H =0.939 mm

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VIDYALAKSHMI, C. S., and CHANNABASAPPA BALIGAR. "MODELING AND SIMULATION OF LOW VOLTAGE POWER SUPPLY FOR ACTIVE PHASED ARRAY RADAR." International Journal of Electronics Signals and Systems, January 2013, 198–203. http://dx.doi.org/10.47893/ijess.2013.1105.

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This paper deals with the modeling and simulation of low voltage power supply (LVPS) unit to the ACTIVE PHASED ARRAY RADAR, which is used for sensing different targets at a time. This RADAR system contains flat bank of small identical antennas and huge number of transmitting and receiving modules for electronic scanning. This radar antenna requires power in different levels for various electronic devices. The proposed design of LV power supply will have the ability to manage temperature variations with high efficiency under different loading condition. The closed loop control such as voltage mode control and current mode control are used to regulate the output voltage with high switching frequency of 400khz has been designed. Simulations are performed using MATLAB / SIMULINK software.

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M, SUNIL KUMAR, S. G. SRIVANI, and VENKATESH PRABHU. "DESIGN & ANALYSIS OF FLY BACK CONVERTER FOR GRID & FILAMENT POWER SUPPLIES OF TRAVELLING WAVE TUBE." International Journal of Power System Operation and Energy Management, January 2014, 25–29. http://dx.doi.org/10.47893/ijpsoem.2014.1115.

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In High Power Pulsed Radar Transmitters the gridded TWT are used and consists of floating deck modulator unit which houses the Grid and Filament power supplies. The Grid Control includes the Grid Positive & Grid Negative Power Supplies. The Positive voltage is used to turn on the TWT & Negative voltage is used to operate the TWT in off state. The Filament power supply heats the cathode to required temperature to emit electrons. The aim of the project is to design the Grid power supplies and Filament Power supply based on the Fly back Converter topology which is operated at 100 KHz in DCM mode and CCM mode respectively. The Pulse width modulation technique is used to maintain the voltage at desired value using an IC UC1526.The switching device is protected ag

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"Smart Radar Glasses." International Journal of Recent Technology and Engineering 8, no. 5 (January 30, 2020): 3493–96. http://dx.doi.org/10.35940/ijrte.e5884.018520.

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The aim of the project is to help differently able person, especially blind or visually impaired people, who are unable to recognize the object which is coming towards them. When a visually impaired person navigates into the heavy traffic area, it is difficult for them to cross the street. The outcome of the project is to give a signal to the visually impaired person, so that he/she can be able to keep themselves in a safe/static zone and is easy to use for the visually impaired person. In this project we use glass sensors having an accurate and precise sensor (VL53L1X) which is based on the LIDAR which will calculate the distance between objects or hurdles in front of blind person and respond. For response we have use a vibrating mini motor which will alert the blind person by giving vibrating alert. A vibration will be produced in accordance with the distance. Nearer the object, faster will be the vibration and far the object, slower will be the vibration. We have tried to make a user friendly and handy equipment by using a power supply of 3.7V battery, which is rechargeable, compact in size and easy to use by the user. An Arduino Nano is being used to reduce complexity of circuit and to produce the required output.

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Journal articles on the topic 'Radar power supply'

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