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Journal articles on the topic 'CHIRP INPUT'

Author: Grafiati

Published: 11 September 2023

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1

Liu, Weici. "Effect of initial chirp for input pulse on supercontinuum generation." Journal of Physics: Conference Series 2029, no. 1 (2021): 012019. http://dx.doi.org/10.1088/1742-6596/2029/1/012019.

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Abstract The generation of supercontinuum spectrum is a very complex nonlinear process. Based on the nonlinear Schrodinger equation (NLSE), the effect of initial chirp on supercontinuum generation is numerically studied by split-step Fourier (SSF) method. The positive chirp and negative chirp have different effects on the supercontinuum generation. The results show that the energy distribution of supercontinuum spectrum can be improved by selecting appropriate chirp value.

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2

Mulsow, Jason, James J. Finneran, Madelyn G. Strahan, Dorian S. Houser, and Robert F. Burkard. "Input compensation of dolphin and sea lion auditory brainstem responses using frequency-modulated up-chirps." Journal of the Acoustical Society of America 154, no. 2 (2023): 739–50. http://dx.doi.org/10.1121/10.0020566.

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Frequency-modulated “chirp” stimuli that offset cochlear dispersion (i.e., input compensation) have shown promise for increasing auditory brainstem response (ABR) amplitudes relative to traditional sound stimuli. To enhance ABR methods with marine mammal species known or suspected to have low ABR signal-to-noise ratios, the present study examined the effects of broadband chirp sweep rate and level on ABR amplitude in bottlenose dolphins and California sea lions. “Optimal” chirps were designed based on previous estimates of cochlear traveling wave speeds (using high-pass subtractive masking met

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3

Solyman, Ahmad AA, Hani Attar, Mohammad R. Khosravi, and Baki Koyuncu. "MIMO-OFDM/OCDM low-complexity equalization under a doubly dispersive channel in wireless sensor networks." International Journal of Distributed Sensor Networks 16, no. 6 (2020): 155014772091295. http://dx.doi.org/10.1177/1550147720912950.

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In this article, three novel systems for wireless sensor networks based on Alamouti decoding were investigated and then compared, which are Alamouti space–time block coding multiple-input single-output/multiple-input multiple-output multicarrier modulation (MCM) system, extended orthogonal space–time block coding multiple-input single-output MCM system, and multiple-input multiple-output system. Moreover, the proposed work is applied over multiple-input multiple-output systems rather than the conventional single-antenna orthogonal chirp division multiplexing systems, based on the discrete frac

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4

van Brederode, J. F. M., and A. J. Berger. "GAD67-GFP+ Neurons in the Nucleus of Roller. II. Subthreshold and Firing Resonance Properties." Journal of Neurophysiology 105, no. 1 (2011): 249–78. http://dx.doi.org/10.1152/jn.00492.2010.

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In the companion paper we show that GAD67-GFP+ (GFP+) inhibitory neurons located in the Nucleus of Roller of the mouse brain stem can be classified into two main groups (tonic and phasic) based on their firing patterns in responses to injected depolarizing current steps. In this study we examined the responses of GFP+ cells to fluctuating sinusoidal (“chirp”) current stimuli. Membrane impedance profiles in response to chirp stimulation showed that nearly all phasic cells exhibited subthreshold resonance, whereas the majority of tonic GFP+ cells were nonresonant. In general, subthreshold resona

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5

Tang, Qing, and Guanshen Zhang. "Chirp encoded joint transform correlators with input scale search." Optics Communications 107, no. 1-2 (1994): 23–27. http://dx.doi.org/10.1016/0030-4018(94)90097-3.

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6

Tan, See Ling, Yu-Fu Chen, Chieh-Yu Liu, Kuo-Chung Chu, and Pei-Chun Li. "Shortened neural conduction time in young adults with tinnitus as revealed by chirp-evoked auditory brainstem response." Journal of the Acoustical Society of America 153, no. 4 (2023): 2178–89. http://dx.doi.org/10.1121/10.0017789.

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Tinnitus is generally considered to be caused by neuroplastic changes in the central nervous system, triggered by a loss of input from the damaged peripheral system; however, conflicting results on auditory brainstem responses (ABRs) to clicks have been reported previously in humans with tinnitus. This study aimed to compare the effect of tinnitus on ABRs to chirps with those to clicks in normal-hearing young adults with tinnitus. The results showed that the tinnitus group had no significantly poorer hearing thresholds (0.25–16 kHz), click-evoked otoacoustic emissions (1–16 kHz), and speech pe

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7

Munaweera, P. C. T., and K. A. I. L. Wijewardena Gamalath. "Simulation of Pulse Propagation in Optical Fibers." International Letters of Chemistry, Physics and Astronomy 64 (February 2016): 159–70. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.64.159.

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A theoretical model was developed for light pulses propagating in optical fibers by considering the nonlinear effects, the self-phase modulation and group velocity dispersion effects. The split step Fourier method was used to generate soliton pulses in a fiber composed of a glass core surrounded by a cladding layer. Gaussian and hyperbolic secant input pulses were used for the simulation. By varying the initial chirp, input power and nonlinear coefficient for an input Gaussian pulse at wavelength of λ =1.55μm with initial pulse width 125ps for second order dispersion β2=−20 ps2km-1, nonlinear

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8

Munaweera, P. C. T., and K. A. I. L. Wijewardena Gamalath. "Simulation of Pulse Propagation in Optical Fibers." International Letters of Chemistry, Physics and Astronomy 64 (February 15, 2016): 159–70. http://dx.doi.org/10.56431/p-qb35f6.

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A theoretical model was developed for light pulses propagating in optical fibers by considering the nonlinear effects, the self-phase modulation and group velocity dispersion effects. The split step Fourier method was used to generate soliton pulses in a fiber composed of a glass core surrounded by a cladding layer. Gaussian and hyperbolic secant input pulses were used for the simulation. By varying the initial chirp, input power and nonlinear coefficient for an input Gaussian pulse at wavelength of λ =1.55μm with initial pulse width 125ps for second order dispersion β2=−20 ps2 km-1 , nonlinea

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9

Zupanc, Günther K. H., and Leonard Maler. "Evoked chirping in the weakly electric fish Apteronotus leptorhynchus: a quantitative biophysical analysis." Canadian Journal of Zoology 71, no. 11 (1993): 2301–10. http://dx.doi.org/10.1139/z93-323.

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Apteronotus leptorhynchus, a gymnotiform fish, produces highly regular electric organ discharges of 600–1000 Hz. Short-term modulations of the electric organ discharge ("chirps") were elicited by imitating the discharges of neighboring fish. Chirps displayed an increase in frequency of approximately 100 Hz, a duration of about 15 ms, and an absolute amplitude of 0.5–2 mV. Since, similar to natural conditions, chirps summated with the beat caused by interference of the fish's own electric organ discharge and the imitating discharge, the size and shape of the chirp's amplitude envelope varied gr

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10

Don, Manuel, Claus Elberling, and Erin Maloff. "Input and Output Compensation for the Cochlear Traveling Wave Delay in Wide-Band ABR Recordings: Implications for Small Acoustic Tumor Detection." Journal of the American Academy of Audiology 20, no. 02 (2009): 099–108. http://dx.doi.org/10.3766/jaaa.20.2.3.

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Background: The Stacked ABR (auditory brainstem response) attempts at the output of the auditory periphery to compensate for the temporal dispersion of neural activation caused by the cochlear traveling wave in response to click stimulation. Compensation can also be made at the input by using a chirp stimulus. It has been demonstrated that the Stacked ABR is sensitive to small tumors that are often missed by standard ABR latency measures. Purpose: Because a chirp stimulus requires only a single data acquisition run whereas the Stacked ABR requires six, we try to evaluate some indirect evidence

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11

Ivanov Spassov, Sevdalin. "CHIRP FILTER JAMMING IMMUNITY RESEARCH." International Journal of Advanced Research 9, no. 01 (2021): 966–71. http://dx.doi.org/10.21474/ijar01/12377.

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The pulse compression technique uses a matched filter to extract an echo signal in the radars receiver. A model of a matched filter for a chirp signal was synthesized using the Simulink Tool of the MATLAB software. Pulse jamming and chirp jamming signals were feed to the input of the matched filter. The output signals were measured. The matched filters degree of suppression of these jamming signals was assessed. Conclusions were made about the jamming immunity of a radar operating with a Chirp matched filter.

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12

Javidi, Bahram, and Qing Tang. "Chirp-encoded joint transform correlators with a single input plane." Applied Optics 33, no. 2 (1994): 227. http://dx.doi.org/10.1364/ao.33.000227.

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13

Varela, O., B. Alonso, I. J. Sola, et al. "Self-compression controlled by the chirp of the input pulse." Optics Letters 35, no. 21 (2010): 3649. http://dx.doi.org/10.1364/ol.35.003649.

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14

Al-Qahtani, Saeed, Ali Alomary, and Marwan Althomali. "Transit time spectrum dependence upon ultrasound input wave types propagating through complex structures." Journal of Umm Al-Qura University for Medical Sciences 9, no. 1 (2023): 63–70. http://dx.doi.org/10.54940/ms45313008.

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Background: Ultrasound transit time spectroscopy (UTTS) has been introduced previously to characterize the propagation of ultrasound waves through complex structures such as cancellous bone to estimate bone quality and quantity. UTTS describes the propagation of ultrasonic waves through a medium with two components of differing sound speeds (e.g., bone and marrow) as a set of parallel sonic rays. The transit time spectrum (TTS) is derived via the digital deconvolution of the input and output signals. Aim: To investigate the dependence of TTS upon the type of ultrasound input wave, including fo

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15

Konyukhov, A. I., and P. A. Mavrin. "Chirped soliton fission and fusion in dispersion oscillating fibers." Laser Physics 33, no. 1 (2022): 015401. http://dx.doi.org/10.1088/1555-6611/aca4cd.

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Abstract We found that pre-chirp of initial pulses allows to control both the fission and fusion of solitons in dispersion oscillating fiber characterized by a sinusoidally varying group velocity dispersion. The fission of second order solitons and collision of two co-propagated solitons are considered. It is shown that initial chirp can prevent the resonant fission of second order soliton into two pulses propagating with different group velocities. Inelastic collision of two in-phase solitons is found can be quite different, when the chirp imposed on initial pulses. The soliton transformation

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16

Mitchell, Cassie S., and Robert H. Lee. "The dynamics of somatic input processing in spinal motoneurons in vivo." Journal of Neurophysiology 105, no. 3 (2011): 1170–78. http://dx.doi.org/10.1152/jn.00592.2010.

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Uncovering how motoneurons utilize their voltage-sensitive conductances to systematically respond to a variety of inputs is paramount to understanding synaptic integration. In this study, we examine the input dynamics and frequency-dependent characteristics of active conductances in motoneurons as viewed from the soma in the decerebrate cat. We evaluated the somatic response of the motoneuron by superimposing a voltage sinus sweep (a sine wave in which frequency increases with time, which is often referred to as a zap or chirp) at a subset of membrane holding potentials during discontinuous, s

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17

Kuzmin, M. S., V. V. Davydov, and S. A. Rogov. "On the use of a multi-raster input of one-dimensional signals in two-dimensional optical correlators." Computer Optics 43, no. 3 (2019): 391–96. http://dx.doi.org/10.18287/2412-6179-2019-43-3-391-396.

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A mathematical description of a coherent optical correlator for the multi-raster input of long signals is given. It is shown that such an input makes it possible to reduce the value of false correlation maxima that are generally found at the output of a correlator with a single-raster input. It is shown that false maxima do not appear when processing signals with a thumbtack ambiguity function, allowing one to do without a multi-raster input. The results of the theoretical analysis are confirmed by experiments with chirp signals and M-sequence type signals.

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18

Ivanov Spassov, Sevdalin. "JAMMINGIMMUNITY RESEARCH OF A RADAR OPERATING WITH CHIRP SIGNAL." International Journal of Advanced Research 8, no. 12 (2020): 731–37. http://dx.doi.org/10.21474/ijar01/12204.

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Pulse compressed signal enhances the jamming immunity of a radar operating with such a signal. The matched filter is one of the most important elements in the pulse compression technique. A model of a matched filter for a chirp signal was synthesized using the Simulink tool of the Matlab software. Interference signals were feed to the input of the matched filter and output signals were measured. The matched filters degree of suppression of these interference signals was assessed. Conclusions were made about the jamming immunity of radar operating with chirp signal.

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19

Ivanov Spassov, Sevdalin. "JAMMINGIMMUNITY RESEARCH OF A RADAR OPERATING WITH CHIRP SIGNAL." International Journal of Advanced Research 8, no. 12 (2020): 731–37. http://dx.doi.org/10.21474/ijar01/12204.

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Pulse compressed signal enhances the jamming immunity of a radar operating with such a signal. The matched filter is one of the most important elements in the pulse compression technique. A model of a matched filter for a chirp signal was synthesized using the Simulink tool of the Matlab software. Interference signals were feed to the input of the matched filter and output signals were measured. The matched filters degree of suppression of these interference signals was assessed. Conclusions were made about the jamming immunity of radar operating with chirp signal.

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20

Lan, Xiang, Min Zhang, and Jin-Xing Li. "OFDM Chirp Waveform Design Based on Subchirp Bandwidth Overlap and Segmented Transmitting for Low Correlation Interference in MIMO Radar." Sensors 19, no. 12 (2019): 2696. http://dx.doi.org/10.3390/s19122696.

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There are some special merits for the orthogonal frequency division multiplexing (OFDM) chirp waveform as multiple input multiple output (MIMO) signals. This signal has high range resolution, good Doppler tolerance, and constant modulus superiority since it exploits a full bandwidth and is based on chirp signals. The correlation sidelobe peaks level are critical for the detection requirement of MIMO radar signals, however conventional OFDM chirp signals produce high autocorrelation sidelobe peaks (ASP) and cross-correlation peaks (CP), which reduces detection performance. In this paper, we exp

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21

Stewart, Shania, Ha H. Nguyen, Robert Barton, and Jerome Henry. "Reducing the Cost of Implementing Filters in LoRa Devices." Sensors 19, no. 18 (2019): 4037. http://dx.doi.org/10.3390/s19184037.

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This paper presents two methods to optimize LoRa (Low-Power Long-Range) devices so that implementing multiplier-less pulse shaping filters is more economical. Basic chirp waveforms can be generated more efficiently using the method of chirp segmentation so that only a quarter of the samples needs to be stored in the ROM. Quantization can also be applied to the basic chirp samples in order to reduce the number of unique input values to the filter, which in turn reduces the size of the lookup table for multiplier-less filter implementation. Various tests were performed on a simulated LoRa system

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22

Schöneich, Stefan, and Berthold Hedwig. "Feedforward discharges couple the singing central pattern generator and ventilation central pattern generator in the cricket abdominal central nervous system." Journal of Comparative Physiology A 205, no. 6 (2019): 881–95. http://dx.doi.org/10.1007/s00359-019-01377-7.

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Abstract We investigated the central nervous coordination between singing motor activity and abdominal ventilatory pumping in crickets. Fictive singing, with sensory feedback removed, was elicited by eserine-microinjection into the brain, and the motor activity underlying singing and abdominal ventilation was recorded with extracellular electrodes. During singing, expiratory abdominal muscle activity is tightly phase coupled to the chirping pattern. Occasional temporary desynchronization of the two motor patterns indicate discrete central pattern generator (CPG) networks that can operate indep

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23

Cheng, Wenhai, Qunying Zhang, Wei Lu, Haiying Wang, and Xiaojun Liu. "An Efficient Digital Channelized Receiver for Low SNR and Wideband Chirp Signals Detection." Applied Sciences 13, no. 5 (2023): 3080. http://dx.doi.org/10.3390/app13053080.

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Synthetic aperture radar (SAR) is essential for obtaining intelligence in modern information warfare. Wideband chirp signals with a low signal-to-noise ratio (SNR) are widely used in SAR. Intercepting low-SNR wideband chirp signals is of great significance for anti-SAR reconnaissance. Digital channelization technology is an effective means to intercept wideband signals. The existing digital channelization methods have the following problems: the contradiction of reception blind zone and signal spectrum aliasing, high computational complexity, and low estimating accuracy for chirp signals with

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24

Rahman, M. S., and G. F. Gott. "A Comparative Study of the Outputs of a Chirp-Matched Filter and a Dispersive Line for the Matched Input Chirp Signal." IETE Journal of Research 42, no. 6 (1996): 401–7. http://dx.doi.org/10.1080/03772063.1996.11415949.

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25

Deng, Zhixiang, and Meng Zhang. "Dynamics of Dispersive Wave Generation in Gas-Filled Photonic Crystal Fiber with the Normal Dispersion." Advances in Condensed Matter Physics 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/1268230.

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The absence of Raman and unique pressure-tunable dispersion is the characteristic feature of gas-filled photonic crystal fiber (PCF), and its zero dispersion points can be extended to the near-infrared by increasing gas pressure. The generation of dispersive wave (DW) in the normal group velocity dispersion (GVD) region of PCF is investigated. It is demonstrated that considering the self-steepening (SS) and introducing the chirp of the initial input pulse are two suitable means to control the DW generation. The SS enhances the relative average intensity of blue-shift DW while weakening that of

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26

Zhu, Qiuming, Xinglin Liu, Xuefeng Yin, Xiaomin Chen, and Cuiwei Xue. "A Novel Simulator of Nonstationary Random MIMO Channels in Rayleigh Fading Scenarios." International Journal of Antennas and Propagation 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/3492591.

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For simulations of nonstationary multiple-input multiple-output (MIMO) Rayleigh fading channels in time-variant scattering environments, a novel channel simulator is proposed based on the superposition of chirp signals. This new method has the advantages of low complexity and implementation simplicity as the sum of sinusoids (SOS) method. In order to reproduce realistic time varying statistics for dynamic channels, an efficient parameter computation method is also proposed for updating the frequency parameters of employed chirp signals. Simulation results indicate that the proposed simulator i

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27

Dafydd, Ifan, and Zahra Sharif Khodaei. "Laser Vibrometer Imaging of Delamination Interaction with Lamb Waves Using a Chirp Excitation Method." Key Engineering Materials 754 (September 2017): 375–78. http://dx.doi.org/10.4028/www.scientific.net/kem.754.375.

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One method that has shown great potential in visualising and characterising the interaction of guided waves with damage in composites is Laser Vibrometry. A Laser Doppler Vibrometer (LDV) can be used to produce 2D wavefield images of guided Lamb waves but a single scan is very time consuming and normally multiple scans are required at various frequencies in order to determine the best input signal. This paper demonstrates the use of a chirp excitation method requiring only a single scan and a post-processing algorithm to obtain results corresponding to any narrowband signal within the frequenc

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Lan, Xuegang, Tao Wan, Kaili Jiang, Ying Xiong, and Bin Tang. "Intelligent Recognition of Chirp Radar Deceptive Jamming Based on Multi-Pulse Information Fusion." Sensors 21, no. 8 (2021): 2693. http://dx.doi.org/10.3390/s21082693.

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The perception of jamming types is very important for protecting our radar in complex electromagnetic environments. Radar active deceptive jamming based on digital radio frequency memory (DRFM) has a high coherence with the target echo, which confuses the information of the target echo and achieves the effect of hiding the real target. Traditional deceptive jamming recognition methods need to extract complex features and artificially set classification thresholds, which is inefficient. The existing neural network-based jamming identification methods still follow the pattern of signal modulatio

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29

Milián, Carles, Amélie Jarnac, Yohann Brelet, et al. "Effect of input pulse chirp on nonlinear energy deposition and plasma excitation in water." Journal of the Optical Society of America B 31, no. 11 (2014): 2829. http://dx.doi.org/10.1364/josab.31.002829.

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30

Zhang, Bo, Jinglong Han, Haiwei Yun, and Xiaomao Chen. "Nonlinear Aeroelastic System Identification Based on Neural Network." Applied Sciences 8, no. 10 (2018): 1916. http://dx.doi.org/10.3390/app8101916.

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This paper focuses on the nonlinear aeroelastic system identification method based on an artificial neural network (ANN) that uses time-delay and feedback elements. A typical two-dimensional wing section with control surface is modelled to illustrate the proposed identification algorithm. The response of the system, which applies a sine-chirp input signal on the control surface, is computed by time-marching-integration. A time-delay recurrent neural network (TDRNN) is employed and trained to predict the pitch angle of the system. The chirp and sine excitation signals are used to verify the ide

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31

Hemant, Somen Adhikary, and Mousumi Basu. "Generation of Parabolic pulse by nonlinear pulse reshaping inside a Silicon on Insulator (SOI) Waveguide." Journal of Physics: Conference Series 2357, no. 1 (2022): 012010. http://dx.doi.org/10.1088/1742-6596/2357/1/012010.

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In recent times, silicon photonics attracts a lot of attraction of researchers. It is the technology that converts many functions of the circuit on the thumb-size chip. Nowadays, various types of technology platforms are being used to design photonic integrated circuits using various materials such as high index glass, semiconductors, polymers, and silicon. In our work, we have used silicon to design rectangular silicon on Insulator (SOI) buried waveguide. This type of waveguide has shown great potential in the field of pulse reshaping. We have used the effective index method for the calculati

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32

Bakar, M. A. A., D. A. Green, and A. V. Metcalfe. "Comparison of Spectral and Wavelet Estimators of Transfer Function for Linear Systems." East Asian Journal on Applied Mathematics 2, no. 3 (2012): 214–37. http://dx.doi.org/10.4208/eajam.170512.270712a.

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AbstractWe compare spectral and wavelet estimators of the response amplitude operator (RAO) of a linear system, with various input signals and added noise scenarios. The comparison is based on a model of a heaving buoy wave energy device (HBWED), which oscillates vertically as a single mode of vibration linear system. HBWEDs and other single degree of freedom wave energy devices such as oscillating wave surge convertors (OWSC) are currently deployed in the ocean, making such devices important systems to both model and analyse in some detail. The results of the comparison relate to any linear s

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Chang, Hsiu-Chen, Patrick Roblin, Yunsik Hahn, Jose I. Martinez-Lopez, and Chenyu Liang. "CW and Modulated Input Second Harmonic Injection for Efficiency Enhancement in Broadband Power Amplifiers." Electronics 10, no. 20 (2021): 2507. http://dx.doi.org/10.3390/electronics10202507.

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The second-harmonic input impedance plays a critical role on the performance of GaN power amplifiers. In a recent paper, a drain efficiency enhancement for a continuous-mode power amplifiers was reported to be achieved using active broadband second-harmonic injection at the PA input. In this paper, the strategy for selecting the second-harmonic input impedance and the necessity for using active injection in such broadband PAs are discussed in detail. Additionally, the methodology for designing an embedded broadband diplexer in the input matching network is reported. Finally, the importance of

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Li, Jing Jiao, Dong An, Jiao Wang, and Chao Qun Rong. "Speech Endpoint Detection in Noisy Environment Based on the Ensemble Empirical Mode Decomposition." Advanced Engineering Forum 2-3 (December 2011): 135–39. http://dx.doi.org/10.4028/www.scientific.net/aef.2-3.135.

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Speech endpoint detection is one of the key problems in the practical application of speech recognition system. In this paper, speech signal contained chirp is decomposed into several intrinsic mode function (IMF) with the method of ensemble empirical mode decomposition (EEMD). At the same time, it eliminates the modal mix superposition phenomenon which usually comes out in processing speech signal with the algorithm of empirical mode decomposition (EMD). After that, selects IMFs contained major noise through the adaptive algorithm. Finally, the IMFs and speech signal contained chirp are input

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Zhao, Quan, Ling Tong, and Bo Gao. "Advanced Chirp Transform Spectrometer with Novel Digital Pulse Compression Method for Spectrum Detection." Applied Sciences 11, no. 3 (2021): 960. http://dx.doi.org/10.3390/app11030960.

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Based on chirp transform and pulse compression technology, chirp transform spectrometers (CTSs) can be used to perform high-resolution and real-time spectrum measurements. Nowadays, they are widely applied for weather and astronomical observations. The surface acoustic wave (SAW) filter is a key device for pulse compression. The system performance is significantly affected by the dispersion characteristics match and the large insertion loss of the SAW filters. In this paper, a linear phase sampling and accumulating (LPSA) algorithm was developed to replace the matched filter for fast pulse com

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Takayama, Takuya, Masayuki Sugano, Yukinobu Tokieda, and Hiroki Sugawara. "Hybrid SIMO and MIMO sparse array radar." International Journal of Microwave and Wireless Technologies 6, no. 3-4 (2014): 389–95. http://dx.doi.org/10.1017/s1759078714000154.

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This paper clarifies what we benefit from single-input–multiple-output (SIMO) or multiple-input–multiple-output (MIMO) radar. We have developed an X-band sparse array imaging radar system capable of operating at both SIMO and MIMO modes. The hybrid radar modes are realized without any modification in hardware, but simply by switching the scheme of waveform generation and post-processing. A comparison has been made between the SIMO mode adopting a chirp pulse waveform and the MIMO mode based on the code-division multiple access method using the Gold-coded pulse waveform. Mutually complementary

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Veljković, Marija, Ana Mančić, Daniela Milović, and Aleksandra Maluckov. "Numerical study of high intensity events in the supercontinuum generation in the presence of input chirp." Optik 196 (November 2019): 163180. http://dx.doi.org/10.1016/j.ijleo.2019.163180.

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38

Bhamidipati, J. K. P., K. C. Durbhakula, and A. N. Caruso. "A dynamically tunable discrete-element transmission line pulse generator." AIP Advances 13, no. 4 (2023): 045205. http://dx.doi.org/10.1063/5.0125277.

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The Frozen Wave Generator (FWG) is a megawatt-class radio frequency pulse forming network that converts DC input up to ones-of-GHz center frequency ( f c) by superposing an ensemble of alternately charged reactive storage elements. In this work, we demonstrate an all-solid-state, dynamically tunable, and chirp-capable FWG using the lumped-element transmission line (LETL) topology. A 12-segment LETL-FWG switched using a MOSFET is demonstrated and directly compared with a literature standard coaxial-based system. Comparison metrics for pulse width ( tpulse) are studied as a function of the trans

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Adhikary, Somen, and Mousumi Basu. "Nonlinear pulse reshaping in a typically designed silicon-on-insulator waveguide and its application to generate a high repetition rate pulse train." Journal of Optics 23, no. 12 (2021): 125506. http://dx.doi.org/10.1088/2040-8986/ac34e5.

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Abstract A silicon-on-insulator (SOI) planar waveguide is designed with a small group velocity dispersion (β 2) ∼2.212 (ps2 m−1) and a quite high nonlinear coefficient (γ) of ∼360.57 (W−1 m−1). The designed waveguide is capable of reshaping a super-Gaussian input optical pulse into a parabolic pulse (PP), without any use of external gain. The same waveguide with a relatively longer length can also generate a triangular pulse (TP) by using a positive chirp at the input. In both cases, PP and TP are created at a much shorter optimum length (L opt) of a few millimeters when compared to previously

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Ivanov Spassov, Sevdalin. "SIMULATION MODELING OF THE INTERFERENCE IMMUNITY OF THE RADARS OPERATING WITH COMPRESSED SIGNAL." International Journal of Advanced Research 8, no. 12 (2020): 799–804. http://dx.doi.org/10.21474/ijar01/12216.

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The immunity to the interference of a radar operating with a pulse compression signal is an important feature. The matched filter is one of the elements of the radar, providing resistance to interference. A model of a matched filter to chirp signal has synthesized using the Simulink tool of the Matlab software. Two types of interference signals have fed to the matched filter input, and the output signals are measured. The matched filters degree of suppression against these two interference signals has been assessed. Inferences about the interference immunity of the radars operating with compre

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Li Gang, Liu Hong-Jie, Lu Feng, et al. "Investigation on the influences of linear chirp with different input pulse intensities on BaF2 cross-polarized wave generation." Acta Physica Sinica 64, no. 2 (2015): 020602. http://dx.doi.org/10.7498/aps.64.020602.

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Mandeng, Lucien Mandeng, Clement Tchawoua, Hippolyte Tagwo, Mourad Zghal, Rim Cherif, and Alidou Mohamadou. "Role of the Input Profile Asymmetry and the Chirp on the Propagation in Highly Dispersive and Nonlinear Fibers." Journal of Lightwave Technology 34, no. 24 (2016): 5635–41. http://dx.doi.org/10.1109/jlt.2016.2624699.

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Sarotama, Afrias, and Benyamin Kusumoputro. "System Identification of UAV Alap-Alap Using Back Propagation Neural Network." Applied Mechanics and Materials 373-375 (August 2013): 1212–19. http://dx.doi.org/10.4028/www.scientific.net/amm.373-375.1212.

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A good model is necessary in order to design a controller of a system off-line. It is especially beneficial in the implementation of new advanced control schemes in Unmanned Aerial Vehicle (UAV). Considering the safety and benefit of an off-line tuning of the UAV controllers, this paper identifies a dynamic MIMO UAV nonlinear system which is derived based on the collection of input-output data taken from a test flights (36250 samples data). These input-output sample flight data are grouped into two flight data sets. The first flight data set, a chirp signal, is used for training the neural net

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Paun, Maria-Alexandra, Vladimir-Alexandru Paun, and Viorel-Puiu Paun. "Electrical Signal Modeling in Cochlear Implants. Study of Temperature and Humidity Effects." Micromachines 12, no. 7 (2021): 785. http://dx.doi.org/10.3390/mi12070785.

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The present paper discusses the climatic effects of humidity and temperature on cochlear implant functioning and the quality of the electrical sound signal. MATLAB Simulink simulations were prepared, offering insights into signal behavior under such climatic parameter changes. A simulation setup of the cochlear implant was developed, where a source type selection was used to change between a voice recording and a “chirp” sound. In addition, a DC blocking filter was applied to the input signal. A simulation code, with the application of the climatic influence via the air attenuation function, w

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Lin, Yueguan, Yida Fan, Chenglong Jiang, Zhiqiang Wang, and Weizeng Shao. "MIMO SAR Using Orthogonal Coding: Design, Performance Analysis, and Verifications." International Journal of Antennas and Propagation 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/629506.

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Multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) is a promising technology in radar imaging which provides a better balance of azimuth resolution and swath width compared with traditional single-input single-output (SISO) SAR. It has the potential to help scientists and engineers to design ambitious SAR system with higher resolution and wider swath. This paper studies the principle of MIMO SAR using orthogonal coding waveform and then provides the performance analysis in resolution and swath width. By using orthogonal coding waveform, lower channel interference is obtained,

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Rakesh Kumar, V., Kamalesh Jana, Indranuj Dey, et al. "Spectral and intensity control of high energy terahertz radiation from bulk liquids." Journal of Physics D: Applied Physics 55, no. 9 (2021): 095107. http://dx.doi.org/10.1088/1361-6463/ac3455.

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Abstract High power, broadband terahertz (THz) radiation from liquids, excited by intense, femtosecond 800 nm laser pulses has been demonstrated recently, overturning the long held belief that liquids would not give such emission due to their absorption in the THz region. Given the widespread interest in the use of THz radiation for several applications and the energy and bandwidth limitations of existing sources, liquids are expected to attract great attention in the future. While the emission at tens of microjoules from liquids is very promising, it is important to explore whether control of

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Xue, Weiqi, Yaohui Chen, Filip Öhman, and Jesper Mørk. "The role of input chirp on phase shifters based on slow and fast light effects in semiconductor optical amplifiers." Optics Express 17, no. 3 (2009): 1404. http://dx.doi.org/10.1364/oe.17.001404.

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Kalybek, Maksat, Mateusz Bocian, Wojciech Pakos, Jacek Grosel, and Nikolaos Nikitas. "Performance of Camera-Based Vibration Monitoring Systems in Input-Output Modal Identification Using Shaker Excitation." Remote Sensing 13, no. 17 (2021): 3471. http://dx.doi.org/10.3390/rs13173471.

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Despite significant advances in the development of high-resolution digital cameras in the last couple of decades, their potential remains largely unexplored in the context of input-output modal identification. However, these remote sensors could greatly improve the efficacy of experimental dynamic characterisation of civil engineering structures. To this end, this study provides early evidence of the applicability of camera-based vibration monitoring systems in classical experimental modal analysis using an electromechanical shaker. A pseudo-random and sine chirp excitation is applied to a sca

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Ghosh, Binoy Krishna, Dipankar Ghosh, and Mousumi Basu. "Generation of stable temporal doublet by a single-mode silicon core optical fiber." Journal of Optics 24, no. 5 (2022): 055503. http://dx.doi.org/10.1088/2040-8986/ac5b50.

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Abstract A highly nonlinear single mode anomalous dispersion silicon-core fiber is designed and optimized at the operating wavelength of 2.2 µm for the purpose of generating stable temporal pulse doublets. To designate the output pulse pair as a perfect Gaussian doublet, two new parameters, dissimilarity factor ( ρ g ) and co-similarity index (μ cs) are introduced. Different input pulse parameters such as power, pulse width and chirp are optimized to obtain Gaussian temporal doublets at the shortest optimum length (∼few cm) which is sufficiently smaller in comparison to silica fibers reported

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Krishna, B. Murali, B. T. Krishna, and K. Babulu. "Hardware Implementation of Stockwell Transform and Smoothed Pseudo Wigner Ville Distribution Transform on FPGA using CORDIC Algorithm." International Journal of Recent Technology and Engineering (IJRTE) 10, no. 5 (2022): 57–60. http://dx.doi.org/10.35940/ijrte.e6705.0110522.

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A comparison of linear and quadratic transform implementation on field programmable gate array (FPGA) is presented. Popular linear transform namely Stockwell Transform and Smoothed Pseudo Wigner Ville Distribution (SPWVD) transform from Quadratic transforms is considered for the implementation on FPGA. Both the transforms are coded in Verilog hardware description language (Verilog HDL). Complex calculations of transformation are performed by using CORDIC algorithm. From FPGA family, Spartan-6 is chosen as hardware device to implement. Synthetic chirp signal is taken as input to test the both d

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