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Journal articles on the topic 'Low frequency radar'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Costanzo, Sandra, Giuseppe Di Massa, Antonio Costanzo, et al. "Multimode/Multifrequency Low Frequency Airborne Radar Design." Journal of Electrical and Computer Engineering 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/857530.

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This work deals with the design of multimode/multifrequency airborne radar suitable for imaging and subsurface sounding. The system operates at relatively low frequencies in the band ranging from VHF to UHF. It is able to work in two different modalities: (i) nadir-looking sounder in the VHF band (163 MHz) and (ii) side-looking imager (SAR) in the UHF band with two channels at 450 MHz and 860 MHz. The radar has been completely designed by CO.Ri.S.T.A. for what concerns the RF and the electronic aspect, and by the University of Calabria for what concerns the design, realization, and test of SAR

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2

Yurovsky, Yury, Vladimir Kudryavtsev, Semyon Grodsky, and Bertrand Chapron. "Low-Frequency Sea Surface Radar Doppler Echo." Remote Sensing 10, no. 6 (2018): 870. http://dx.doi.org/10.3390/rs10060870.

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3

Baranov, G., R. Gabruk та I. Gorishna. "Features of Usіng Pulse-Doppler Radars for Determіnatіon Low-Altіtude Targets". Metrology and instruments, № 2 (3 травня 2019): 62–66. http://dx.doi.org/10.33955/2307-2180(2)2019.62-66.

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In this paper, we analyzed the features of Doppler processing in radars. In ground based radars, the amount of clutter in the radar receiver depends heavily on the radar-to-target geometry. The amount clutter is considerably higher when the radar beam has to face toward the ground. Furthermore, radars employing high PRFs have to deal with an increased amount of clutter due to folding in range. Clutter introduces additional difficulties for airborne radars when detecting ground targets and other targets flying at low altitudes. This is illustrated in Fig. 10.5. Returns from ground clutter emana

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4

Rodriguez, Paul. "Solar radar astronomy with the low-frequency array." Planetary and Space Science 52, no. 15 (2004): 1391–98. http://dx.doi.org/10.1016/j.pss.2004.09.008.

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5

Jacobi, Ch, C. Arras, D. Kürschner, W. Singer, P. Hoffmann, and D. Keuer. "Comparison of mesopause region meteor radar winds, medium frequency radar winds and low frequency drifts over Germany." Advances in Space Research 43, no. 2 (2009): 247–52. http://dx.doi.org/10.1016/j.asr.2008.05.009.

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6

Berquin, Yann, Alain Herique, Wlodek Kofman, and Essam Heggy. "Computing low-frequency radar surface echoes for planetary radar using Huygens-Fresnel's principle." Radio Science 50, no. 10 (2015): 1097–109. http://dx.doi.org/10.1002/2015rs005714.

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7

Javidi, Giti, and Ehsan Sheybani. "Data Visualization for Low-Frequency Inverse Synthetic Aperture Radar (ISAR)." International Journal of Interdisciplinary Telecommunications and Networking 10, no. 3 (2018): 1–8. http://dx.doi.org/10.4018/ijitn.2018070101.

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The purpose of this article was to use ISAR to determine the distance between the receiving antenna and the transmitting antenna. Once a systematic approach has been determined, this article could be used on a spacecraft to locate debris in the path of the carrier. Using low frequency radar that has the transmitting pulse built within the converters, the authors transmitted the data and determined the distance between the two antennas according to the time delay of the radar. Using amplified signals, the relationship between the distance and the time delay for the radar were calculated for eac

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Imhoff, M. L., S. Carson, and P. Johnson. "A low-frequency radar experiment for measuring vegetation biomass." IEEE Transactions on Geoscience and Remote Sensing 36, no. 6 (1998): 1988–91. http://dx.doi.org/10.1109/36.729374.

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9

Geiger, Martin, Christian Wegner, Winfried Mayer, and Christian Waldschmidt. "A Wideband Dielectric Waveguide-Based 160-GHz Radar Target Generator." Sensors 19, no. 12 (2019): 2801. http://dx.doi.org/10.3390/s19122801.

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The increasing number of radar sensors in commercial and industrial products leads to a growing demand for system functionality tests. Conventional test procedures require expensive anechoic chambers to provide a defined test environment for radar sensors. In this paper, a compact and low cost dielectric waveguide radar target generator for level probing radars is presented. The radar target generator principle is based on a long dielectric waveguide as a one-target scenery. By manipulating the field distribution of the waveguide, a specific reflection of a radar target is generated. Two reali

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10

Aguirre, Roberto, Felipe Toledo, Rafael Rodríguez, Roberto Rondanelli, Nicolas Reyes, and Marcos Díaz. "Low-Cost Ka-Band Cloud Radar System for Distributed Measurements within the Atmospheric Boundary Layer." Remote Sensing 12, no. 23 (2020): 3965. http://dx.doi.org/10.3390/rs12233965.

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Radars are used to retrieve physical parameters related to clouds and fog. With these measurements, models can be developed for several application fields such as climate, agriculture, aviation, energy, and astronomy. In Chile, coastal fog and low marine stratus intersect the coastal topography, forming a thick fog essential to sustain coastal ecosystems. This phenomenon motivates the development of cloud radars to boost scientific research. In this article, we present the design of a Ka-band cloud radar and the experiments that prove its operation. The radar uses a frequency-modulated continu

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11

Ilcev, Dimov Stojce. "Introduction to Coastal HF Maritime Surveillance Radars." Polish Maritime Research 26, no. 3 (2019): 153–62. http://dx.doi.org/10.2478/pomr-2019-0056.

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Abstract This paper presents the main technical characteristics and working performances of coastal maritime surveillance radars, such as low-power High-Frequency Surface Wave Radars (HFSWR) and Over the Horizon Radars (OTHR). These radars have demonstrated to be a cost-effective long-range early-warning sensor for ship detection and tracking in coastal waters, sea channels and passages. In this work, multi-target tracking and data fusion techniques are applied to live-recorded data from a network of oceanographic HFSWR stations installed in Jindalee Operational Radar Network (JORN), Wellen Ra

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12

Mouginot, J., E. Rignot, Y. Gim, D. Kirchner, and E. Le Meur. "Low-frequency radar sounding of ice in East Antarctica and southern Greenland." Annals of Glaciology 55, no. 67 (2014): 138–46. http://dx.doi.org/10.3189/2014aog67a089.

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AbstractWe discuss a decameter-wavelength airborne radar sounder, the Warm Ice Sounding Explorer (WISE), that provides ice thickness in areas where radar signal penetration at higher frequencies is expected to be limited. Here we report results for three campaigns conducted in Greenland (2008, 2009, 2010) and two in Antarctica (2009, 2010). Comparisons with higher-frequency radar data indicate an accuracy of ±55 m for ice-thickness measurements in Greenland and ±25 m in Antarctica. We also estimate ice thickness of the Qassimiut lobe in southwest Greenland, where few ice-thickness measurements

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13

Mellios, E., Di Kong, M. Webb, et al. "Impact of Low-Frequency Radar Interference on Digital Terrestrial Television." IEEE Transactions on Broadcasting 59, no. 1 (2013): 84–95. http://dx.doi.org/10.1109/tbc.2012.2232511.

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14

Howlader, Md Omar Faruq, and Tariq Pervez Sattar. "MINIATURIZATION OF DIPOLE ANTENNA FOR LOW FREQUENCY GROUND PENETRATING RADAR." Progress In Electromagnetics Research C 61 (2016): 161–70. http://dx.doi.org/10.2528/pierc15103004.

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15

Inaba, Takayuki, and Kiyomichi Araki. "Space-frequency maximal ratio combining for low-elevation radar target." Electronics and Communications in Japan (Part I: Communications) 87, no. 5 (2004): 75–85. http://dx.doi.org/10.1002/ecja.10143.

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16

Pettinelli, Elena, Sebastian E. Lauro, Elisabetta Mattei, Barbara Cosciotti, and Francesco Soldovieri. "Stratigraphy versus artefacts in the Chang’e-4 low-frequency radar." Nature Astronomy 5, no. 9 (2021): 890–93. http://dx.doi.org/10.1038/s41550-021-01432-x.

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17

Mou, Chun Hui, Tao Hong, Wen Jiang, and Shu Xi Gong. "Complex Spiral Antenna with Low Radar Cross Section Level." Applied Mechanics and Materials 631-632 (September 2014): 306–9. http://dx.doi.org/10.4028/www.scientific.net/amm.631-632.306.

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An ultra-wideband (UWB) circularly polarized complex spiral antenna with low radar cross section (RCS) is proposed in this paper. By replacing the metal reflect board of the antenna with a novel UWB frequency selective surface (FSS), the RCS of the spiral antenna is significantly reduced in a wide frequency range, while the radiation performances of the spiral antenna are maintained. The proposed antenna operates over the frequency band between 2GHz to 6.5GHz under the condition of axial ratio<3dB and |S11| < - 10dB. Simulation and measurement results demonstrate the validation of broadb

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18

Scheiblhofer, Werner, Reinhard Feger, Andreas Haderer, and Andreas Stelzer. "Concept and realization of a low-cost multi-target simulator for CW and FMCW radar system calibration and testing." International Journal of Microwave and Wireless Technologies 10, no. 2 (2018): 207–15. http://dx.doi.org/10.1017/s1759078718000028.

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AbstractWe present the realization of an frequency-modulated continuous-wave radar target simulator, based on a modulated-reflector radar system. The simulator, designed for the 24 GHz frequency band, uses low-cost modulated-reflector nodes and is capable to simultaneously generate multiple targets in a real-time environment. The realization is based on a modular approach and thus provides a high scalability of the whole system. It is demonstrated that the concept is able to simulate multiple artificial targets, located at user-selectable ranges and even velocities, utilized within a completel

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19

Schlegel, K., and A. V. Gurevich. "Radar backscatter from plasma irregularities of the lower E region induced by neutral turbulence." Annales Geophysicae 15, no. 7 (1997): 870–77. http://dx.doi.org/10.1007/s00585-997-0870-z.

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Abstract. Recently, one of the authors (A. V. G.) developed a theory of low-frequency plasma irregularities which are created as a consequence of neutral turbulence in the D and lower E regions. In the following this theory will be applied to coherent backscatter experiments with radars in a frequency range between 5 and 150 MHz. We discuss the dependence of the backscatter cross-section on ionospheric as well as on turbulence parameters. The backscatter increases strongly with decreasing radar frequency. Above 15 MHz the effects discussed here can probably only be detected by very powerful ra

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20

Haynes, Mark S. "Surface and subsurface radar equations for radar sounders." Annals of Glaciology 61, no. 81 (2020): 135–42. http://dx.doi.org/10.1017/aog.2020.16.

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AbstractThis work is a collection of radar equations for low-frequency radar sounding and radar in general that emphasize the form of the radar equation for different target and source geometries. This is meant as a handbook for scientists and engineers that work with or analyze radar sounder systems and interpret radar sounding echoes. Lookup tables summarize the results and derivations are provided for each equation.

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21

Wright, David L., Steven M. Hodge, Jerry A. Bradley, Thomas P. Grover, and Robert W. Jacobel. "Instruments and Methods: A Digital Low-Frequency, Surface-Profiling Ice-Radar System." Journal of Glaciology 36, no. 122 (1990): 112–21. http://dx.doi.org/10.1017/s0022143000005633.

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AbstractA new short-pulse digital profiling radar system that operates at lower frequencies than most ice radars used in polar regions to date has been designed and built by the U.S. Geological Survey. The transmitter is an avalanche transistor pulser which drives a resistively loaded dipole transmitting antenna. A similar, but separate antenna is connected to the receiver. The receiver has adjustable sensitivity time control (STC) of as much as 60 dB to compensate for attenuation and geometric spreading factors. A fiber-optic cable is used to transmit both control signals and data. The data-a

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22

Wright, David L., Steven M. Hodge, Jerry A. Bradley, Thomas P. Grover, and Robert W. Jacobel. "Instruments and Methods: A Digital Low-Frequency, Surface-Profiling Ice-Radar System." Journal of Glaciology 36, no. 122 (1990): 112–21. http://dx.doi.org/10.3189/s0022143000005633.

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AbstractA new short-pulse digital profiling radar system that operates at lower frequencies than most ice radars used in polar regions to date has been designed and built by the U.S. Geological Survey. The transmitter is an avalanche transistor pulser which drives a resistively loaded dipole transmitting antenna. A similar, but separate antenna is connected to the receiver. The receiver has adjustable sensitivity time control (STC) of as much as 60 dB to compensate for attenuation and geometric spreading factors. A fiber-optic cable is used to transmit both control signals and data. The data-a

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23

Levy, Chagai, Monika Pinchas, and Yosef Pinhasi. "Coherent Integration Loss Due to Nonstationary Phase Noise in High-Resolution Millimeter-Wave Radars." Remote Sensing 13, no. 9 (2021): 1755. http://dx.doi.org/10.3390/rs13091755.

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Phase noise refers to the instability of an oscillator, which is the cause of instantaneous phase and frequency deviations in the carrier wave. This unavoidable instability adversely affects the performance of range–velocity radar systems, including synthetic aperture radars (SARs) and ground-moving target indicator (GMTI) radars. Phase noise effects should be considered in high-resolution radar designs, operating in millimeter wavelengths and terahertz frequencies, due to their role in radar capability during the reliable identification of target location and velocity. In general, phase noise

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24

Yang, Jing, Chao Pan, Caijun Wang, Dapeng Jiang, and Biyang Wen. "Wind Turbine Clutter Mitigation in Coastal UHF Radar." Scientific World Journal 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/529230.

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Coastal UHF radar provides a unique capability to measure the sea surface dynamic parameters and detect small moving targets, by exploiting the low energy loss of electromagnetic waves propagating along the salty and good conducting ocean surface. It could compensate the blind zone of HF surface wave radar at close range and reach further distance than microwave radars. However, its performance is susceptible to wind turbines which are usually installed on the shore. The size of a wind turbine is much larger than the wavelength of radio waves at UHF band, which results in large radar cross sec

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25

Wang, Ying, Hong Yan Su, Huai Cheng Zhu, and Qi Yuan. "Parameter Design Method of Stepped-Frequency Radar to Suppress Clutter." Applied Mechanics and Materials 130-134 (October 2011): 2042–46. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.2042.

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The stepped-frequency radar can measure the velocity between radar and target as while as obtain high range resolution. The Doppler shift of moving target may make its high resolution range profile move away from high resolution imaging region of stationary target. Consequently stepped-frequency radar possesses the ability of detecting dim target in clutter, which is suitable for attacking low-altitude dim target with low velocity. In this paper, the distribution of clutter is analyzed in frequency domain firstly. Then the design method of signal parameters is put forward based on the analysis

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26

Li, Zhi, Tian Jin, Yongpeng Dai, and Yongkun Song. "Through-Wall Multi-Subject Localization and Vital Signs Monitoring Using UWB MIMO Imaging Radar." Remote Sensing 13, no. 15 (2021): 2905. http://dx.doi.org/10.3390/rs13152905.

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Radar-based non-contact vital signs monitoring has great value in through-wall detection applications. This paper presents the theoretical and experimental study of through-wall respiration and heartbeat pattern extraction from multiple subjects. To detect the vital signs of multiple subjects, we employ a low-frequency ultra-wideband (UWB) multiple-input multiple-output (MIMO) imaging radar and derive the relationship between radar images and vibrations caused by human cardiopulmonary movements. The derivation indicates that MIMO radar imaging with the stepped-frequency continuous-wave (SFCW)

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27

Bystrov, Aleksandr, Liam Daniel, Edward Hoare, Fatemeh Norouzian, Mikhail Cherniakov, and Marina Gashinova. "Experimental Evaluation of 79 and 300 GHz Radar Performance in Fire Environments." Sensors 21, no. 2 (2021): 439. http://dx.doi.org/10.3390/s21020439.

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This paper presents an experimental study of the propagation of mm-wave/low-THz signals in the frequency ranges of 79 and 300 GHz through fire. Radar performance was investigated in various real scenarios, including fire with strong flame, dense smoke and water vapour. A stereo video camera and a LIDAR were used as a comparison with other common types of sensors. The ability of radars to enable the visibility of objects in fire environments was proven. In all scenarios, the radar signal attenuation was measured, and in the case of steam was compared with theoretical calculations. The analysis

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Bystrov, Aleksandr, Liam Daniel, Edward Hoare, Fatemeh Norouzian, Mikhail Cherniakov, and Marina Gashinova. "Experimental Evaluation of 79 and 300 GHz Radar Performance in Fire Environments." Sensors 21, no. 2 (2021): 439. http://dx.doi.org/10.3390/s21020439.

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This paper presents an experimental study of the propagation of mm-wave/low-THz signals in the frequency ranges of 79 and 300 GHz through fire. Radar performance was investigated in various real scenarios, including fire with strong flame, dense smoke and water vapour. A stereo video camera and a LIDAR were used as a comparison with other common types of sensors. The ability of radars to enable the visibility of objects in fire environments was proven. In all scenarios, the radar signal attenuation was measured, and in the case of steam was compared with theoretical calculations. The analysis

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29

Cho, John Y. N. "A New Radio Frequency Interference Filter for Weather Radars." Journal of Atmospheric and Oceanic Technology 34, no. 7 (2017): 1393–406. http://dx.doi.org/10.1175/jtech-d-17-0028.1.

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AbstractA new radio frequency interference (RFI) filter algorithm for weather radars is proposed in the two-dimensional (2D) range-time/sample-time domain. Its operation in 2D space allows RFI detection at lower interference-to-noise or interference-to-signal ratios compared to filters working only in the sample-time domain while maintaining very low false alarm rates. Simulations and real weather radar data with RFI are used to perform algorithm comparisons. Results are consistent with theoretical considerations and show the 2D RFI filter to be a promising addition to the signal processing ar

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30

Mai, Chaoyun, Jinping Sun, Rui Zhou, and Guohua Wang. "Sparse Frequency Waveform Design for Radar-Embedded Communication." Mathematical Problems in Engineering 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/7270301.

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According to the Tag application with function of covert communication, a method for sparse frequency waveform design based on radar-embedded communication is proposed. Firstly, sparse frequency waveforms are designed based on power spectral density fitting and quasi-Newton method. Secondly, the eigenvalue decomposition of the sparse frequency waveform sequence is used to get the dominant space. Finally the communication waveforms are designed through the projection of orthogonal pseudorandom vectors in the vertical subspace. Compared with the linear frequency modulation waveform, the sparse f

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31

Milan, S. E., M. Lester, and N. Sato. "Multi-frequency observations of E-region HF radar aurora." Annales Geophysicae 21, no. 3 (2003): 761–77. http://dx.doi.org/10.5194/angeo-21-761-2003.

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Abstract. Multi-frequency observations of E-region coherent backscatter from decametre waves reveal that auroral echoes tend to comprise two spectral components superimposed, one at low Doppler shifts, below 250 ms-1, and the other Doppler shifted to near the ion-acoustic speed or above, up to 800 ms-1. The low Doppler shift component occurs at all look directions; Doppler shifts near the ion acoustic speed occur when looking at low flow angles along the direction of the electron drift in the electrojet, and Doppler shifts in excess of the ion acoustic speed occur at intermediate flow angles.

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32

Machado, G. G., M. T. De Melo, H. V. H. Silva Filho, A. G. Neto, and T. R. De Souza. "Low Radar Cross-section and Low Cost Dipole Antenna Reflector." Advanced Electromagnetics 6, no. 3 (2017): 25. http://dx.doi.org/10.7716/aem.v6i3.512.

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This paper presents a method for reducing Radar CrossSection (RCS) of an increased gain metal backed dipole antenna. Numerical simulations were done and compared to a laboratory experiment. The results show that when a Perfect Electrical Conductor (PEC) is replaced by a Frequency Selective Surface (FSS), the antenna is still able to perform with the desired characteristics, but the RCS of the structure is greatly reduced out of band. The design of the FSS and the return loss, gain improvement, and RCS are presented for an antenna operating at 4.2GHz, and the results are compared with a convent

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33

Liu, Yonggang, Robert H. Weisberg, Clifford R. Merz, Sage Lichtenwalner, and Gary J. Kirkpatrick. "HF Radar Performance in a Low-Energy Environment: CODAR SeaSonde Experience on the West Florida Shelf*." Journal of Atmospheric and Oceanic Technology 27, no. 10 (2010): 1689–710. http://dx.doi.org/10.1175/2010jtecho720.1.

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Abstract Three long-range (5 MHz) Coastal Ocean Dynamics Application Radar (CODAR) SeaSonde HF radars overlooking an array of as many as eight moored acoustic Doppler current profilers (ADCPs) have operated on the West Florida Shelf since September 2003 for the purpose of observing the coastal ocean currents. HF radar performance on this low-energy (currents and waves) continental shelf is evaluated with respect to data returns, the rms differences between the HF radar and the ADCP radial currents, bearing offsets, and radial velocity uncertainties. Possible environmental factors affecting the

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34

Baher Safa Hanbali, Samer. "A review of radar signals in terms of Doppler tolerance, time-sidelobe level, and immunity against jamming." International Journal of Microwave and Wireless Technologies 10, no. 10 (2018): 1134–42. http://dx.doi.org/10.1017/s1759078718001174.

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AbstractPulse compression technique allows a radar to achieve the resolution of a short pulse and the energy of a long pulse simultaneously, without the requirement of high-power transmission. Therefore, pulse compression radars have a low probability of intercept capability. The common types of pulse compression signals are frequency modulated waveforms and phase-coded waveforms, which have different properties. The optimum radar signal should have good immunity against deceptive jamming, good Doppler tolerance to detect high-speed targets, and low time-sidelobe level to detect weak targets n

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35

Bodine, David J., Robert D. Palmer, Takashi Maruyama, Caleb J. Fulton, Ye Zhu, and Boon Leng Cheong. "Simulated Frequency Dependence of Radar Observations of Tornadoes." Journal of Atmospheric and Oceanic Technology 33, no. 9 (2016): 1825–42. http://dx.doi.org/10.1175/jtech-d-15-0120.1.

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AbstractTo obtain accurate radar-measured wind measurements in tornadoes, differences between air and Doppler velocities must be corrected. These differences can cause large errors in radar estimates of maximum tangential wind speeds, and large errors in single-Doppler retrievals of radial and vertical velocities. Since larger scatterers (e.g., debris) exhibit larger differences from air velocities compared to small scatterers (e.g., raindrops), the dominant scatterer type affecting radar measurements is examined. In this study, radar variables are simulated for common weather radar frequencie

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Xia, Zhenghuan, Qunying Zhang, Shengbo Ye, et al. "A novel low-frequency coded ground penetrating radar for deep detection." IEICE Electronics Express 12, no. 11 (2015): 20150200. http://dx.doi.org/10.1587/elex.12.20150200.

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37

Hagen, Jon Ove, and Arne Sætrang. "Radio-echo soundings of sub-polar glaciers with low-frequency radar." Polar Research 9, no. 1 (1991): 99–107. http://dx.doi.org/10.3402/polar.v9i1.6782.

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38

HAGEN, JON OVE, and ARNE SÆTRANG. "Radio-echo soundings of sub-polar glaciers with low-frequency radar." Polar Research 9, no. 1 (1991): 99–107. http://dx.doi.org/10.1111/j.1751-8369.1991.tb00405.x.

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39

Kim, Dong-Sik, Jong-Pil Kim, Ju-Young Lee, Yeon Duk Kang, and Sun-Ju Kim. "Ultra Low Noise Hybrid Frequency Synthesizer for High Performance Radar System." Journal of the Korean Society for Aeronautical & Space Sciences 48, no. 1 (2020): 73–79. http://dx.doi.org/10.5139/jksas.2020.48.1.73.

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40

Rignot, E., J. Mouginot, C. F. Larsen, Y. Gim, and D. Kirchner. "Low-frequency radar sounding of temperate ice masses in Southern Alaska." Geophysical Research Letters 40, no. 20 (2013): 5399–405. http://dx.doi.org/10.1002/2013gl057452.

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41

Jungang, Y., H. Xiaotao, J. Thompson, J. Tian, and Z. Zhimin. "Low-frequency ultra-wideband synthetic aperture radar ground moving target imaging." IET Radar, Sonar & Navigation 5, no. 9 (2011): 994. http://dx.doi.org/10.1049/iet-rsn.2010.0387.

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42

Doel, K. van den, and G. Stove. "Modeling and Simulation of Low Frequency Subsurface Radar Imaging in Permafrost." Computer Science and Information Technology 6, no. 3 (2018): 40–45. http://dx.doi.org/10.13189/csit.2018.060302.

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43

Alphonse, Sebastian, and Geoffrey A. Williamson. "On Estimating Nonlinear Frequency Modulated Radar Signals in Low SNR Environments." IEEE Transactions on Aerospace and Electronic Systems 57, no. 3 (2021): 1793–802. http://dx.doi.org/10.1109/taes.2021.3050649.

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44

McDaniel, Jay W., Mark B. Yeary, Hjalti H. Sigmarsson, et al. "Integration and Miniaturization of a Ka-band Stepped Frequency Radar for Un-manned Aerial Vehicle Applications." International Symposium on Microelectronics 2017, no. 1 (2017): 000061–66. http://dx.doi.org/10.4071/isom-2017-tp26_156.

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Abstract In this paper, we present a highly integrated and miniaturized Ka-band stepped frequency radar that can be used for un-manned aerial vehicle applications. The microwave portion of the radar is integrated onto a low temperature co-fired ceramic multi-chip module, utilizing a triple-print gold thick-film metallization, allowing for wire-bonding and solder capabilities. In addition to miniaturization, a metal seal frame was designed to surround the individual microwave circuits providing isolation barriers to reduce electromagnetic coupling within the system and disturbances from outside

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45

Gaitanakis, George-Konstantinos, George Limnaios, and Konstantinos C. Zikidis. "On the use of AESA (Active Electronically Scanned Array) Radar and IRST (InfraRed Search&Track) System to Detect and Track Low Observable Threats." MATEC Web of Conferences 304 (2019): 04001. http://dx.doi.org/10.1051/matecconf/201930404001.

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The radar has been indisputably the most important sensor in the battlefield, allowing early warning and tracking of air vehicles. Modern fighter ircraft employing AESA fire control radars are able to acquire and track targets at long ranges, in the order of 50 nautical miles or more. However, the proliferation of low observable or stealth technology has contested radar capabilities, reducing their detection / tracking ranges roughly to one third. This degradation is more severe concerning fighter aircraft radars, since most stealth threats are optimised for higher frequency bands, as in the c

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Brandewie, Aaron, and Robert Burkholder. "FEKO™ Simulation of Radar Scattering from Objects in Low Earth Orbit for ISAR Imaging." Applied Computational Electromagnetics Society 35, no. 11 (2021): 1358–59. http://dx.doi.org/10.47037/2020.aces.j.351148.

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Objects in low earth orbit such as CubeSats and the International Space Station (ISS) move with constant velocity along a linear trajectory when viewed from a ground-based radar. The small change in attitude of the object as it flies overhead permits the generation of an inverse synthetic aperture radar (ISAR) image. In this paper, Altair’s FEKO™ software is used to model the monostatic radar scattering from the ISS as a function of frequency and aspect angle. The computed data is used for generating a simulated ISAR image from a ground-based radar. The system design requirements for the radar

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Peng, Bo, Zhen Liu, Xizhang Wei, and Xiang Li. "Sinusoidal Frequency Modulation Sparse Recovery for Precession Rate Estimation Using Low-Frequency Long-Range Radar." IEEE Sensors Journal 15, no. 12 (2015): 7329–40. http://dx.doi.org/10.1109/jsen.2015.2469133.

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Yan, Songhua, Shicai Wu, and Biyang Wen. "Low velocity target detection based on time-frequency image for high frequency ground wave radar." Frontiers of Electrical and Electronic Engineering in China 2, no. 4 (2007): 404–9. http://dx.doi.org/10.1007/s11460-007-0075-y.

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Bedard, A. J. "Low-Frequency Atmospheric Acoustic Energy Associated with Vortices Produced by Thunderstorms." Monthly Weather Review 133, no. 1 (2005): 241–63. http://dx.doi.org/10.1175/mwr-2851.1.

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Abstract An infrasonic observatory collocated with the Colorado State University CHILL radar during the summer of 1995 permitted unique comparisons between severe storm kinematics and detected acoustic energy at subaudible frequencies near 1 Hz. Radar observations of a velocity couplet aloft (evolving into a tornado) showed a circulation maximum descending for about 30 min while moving to the east. The detected infrasound followed the trend of these observations. A model of sound radiated from vortex systems predicts frequencies in the range observed. These data are interpreted in the context

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Kirincich, Anthony. "Improved Detection of the First-Order Region for Direction-Finding HF Radars Using Image Processing Techniques." Journal of Atmospheric and Oceanic Technology 34, no. 8 (2017): 1679–91. http://dx.doi.org/10.1175/jtech-d-16-0162.1.

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AbstractFor direction-finding high-frequency (HF) radar systems, the correct separation of backscattered spectral energy due to Bragg resonant waves from that due to more complex double-scattering represents a critical first step toward attaining accurate estimates of surface currents from the range-dependent radar backscatter. Existing methods to identify this “first order” region of the spectra, generally sufficient for lower-frequency radars and low-velocity or low-surface gravity wave conditions, are more likely to fail in higher-frequency systems or locations with more variable current, w

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