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Journal articles on the topic 'Chirp signals'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Zhang, Haowen, and Qiuze Yu. "Photonic Approach to Multi-band Dual-chirp Microwave Waveform Generation with Quadruple Bandwidth." Advances in Engineering Technology Research 9, no. 1 (2024): 762. http://dx.doi.org/10.56028/aetr.9.1.762.2024.

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We propose a scheme for generating a microwave waveform with dual-band, dual-chirp, linearly chirped characteristics and quadruple chirp bandwidth. In this scheme, we employ two cascaded Mach-Zehnder modulators (MZMs), with each modulated by a microwave signal and a linearly frequency modulated (LFM) signal. This modulation technique extends the LFM signal to multiple frequency bands and enhances its bandwidth. By properly adjusting the microwave signal's frequency and the LFM's carrier frequency, we can intelligently combine the up-chirp and down-chirp signals obtained after heterodyne beatin

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2

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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3

YAO, SUSU, and ZHENYA HE. "ANALYSIS OF MULTICOMPONENT CHIRP SIGNALS USING FREQUENCY-SHEAR REPRESENTATION." Journal of Circuits, Systems and Computers 06, no. 04 (1996): 385–401. http://dx.doi.org/10.1142/s0218126696000261.

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This paper is concerned with the problem of multicomponent chirp signal analysis. The traditional analysis tool is time-frequency distribution which has been paid more attention in deterministic nonstationary signal processing. However, for chirp signals, it is difficult to find a best time-frequency representation that has high auto component concentration and cross-term suppression. Generally, any time-frequency representation based on rectangular resolution cell will not result in good performance for signals with time-varying frequency content. In this paper we propose a new representation

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4

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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Steiskal, A. B., S. O. Kovtun, V. V. Voitko, and A. P. Ogarok. "Demodulation of Energy Hidden Linear-Frequency-Modulated Signals." Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 86 (September 30, 2021): 45–51. https://doi.org/10.20535/radap.2021.86.45-51.

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Statement of the problem in generalRecently, there has been a tendency to increase the number of telecommunications systems that use spread spectrum signals: binary phase-shift keying (BPSK) signals with linear frequency modulation, chirp signals and their combinations. Due to this, the anti-jamming of telecommunication systems is increased, the stealth mode of their functioning is provided.This tendency raises issues in the field of radio monitoring systems implementation. The use of spread-spectrum signals in telecommunication systems significantly reduces the spectral height of radio emissi

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Senatorov, L. A., V. V. Khvorenkov, and E. M. Zaytseva. "Impact Assessment of the Chirp Signal Frequency Change Rate on the Energy Secrecy and Noise Immunity." Vestnik IzhGTU imeni M.T. Kalashnikova 26, no. 2 (2023): 85–93. http://dx.doi.org/10.22213/2413-1172-2023-2-85-93.

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The article deals with the issues of noise immunity and energy secrecy of chirp signals. The purpose of the article is to study the rate of chirp signal frequency change and its influence on signal parameters, such as the envelope and spectrum of the signal, the degree of its energy secrecy and noise immunity. A study was made of the chirp signal frequency change rate influence on the amplitude spectrum of the transmitted signal. The study showed that an increase in the chirp signal frequency change rate leads to an increase in the slope control of the sawtooth voltage. In this case, the width

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7

Elgamel, Sherif. "Overlapped Chirp Signals’ Parameters Estimation in Radar ESM Station." Advances in Military Technology 17, no. 2 (2022): 439–55. http://dx.doi.org/10.3849/aimt.01754.

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Three consecutive algorithms are used to estimate the number of multiple overlapped pulsed received chirp signals and their parameters in the electronic support measures (ESM) station noisy receiving window at low signal to noise ratio. The first consecutive algorithm is used to estimate both the number of multiple overlapped received radar signals and the chirp rate of each one in the receiving window. Then, the second consecutive algorithm is used to minimize the additive noise and/or interference in the receiving window by filtering each received chirp signal in the corresponding fractional

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8

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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9

Afanasiev, D. S. "Digital Chirp Processing." LETI Transactions on Electrical Engineering & Computer Science 15, no. 4 (2022): 44–48. http://dx.doi.org/10.32603/2071-8985-2022-15-4-44-48.

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Algorithms for digital signal processing with linear frequency modulation LFM have been developed. A method for calibrating several chirp signals for their subsequent joint processing, an algorithm for shifting a signal in time, compensating for compression or stretching of a signal in time, and determining the start time of a signal are considered, digital signal processing.

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10

Sen, A. K., M. J. Kubek, and H. E. Shannon. "Analysis of Seizure EEG in Kindled Epileptic Rats." Computational and Mathematical Methods in Medicine 8, no. 4 (2007): 225–34. http://dx.doi.org/10.1080/17486700701528970.

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Using wavelet analysis we have detected the presence of chirps in seizure EEG signals recorded from kindled epileptic rats. Seizures were induced by electrical stimulation of the amygdala and the EEG signals recorded from the amygdala were analyzed using a continuous wavelet transform. A time–frequency representation of the wavelet power spectrum revealed that during seizure the EEG signal is characterized by a chirp-like waveform whose frequency changes with time from the onset of seizure to its completion. Similar chirp-like time–frequency profiles have been observed in newborn and adult pat

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Fleming, A. J., A. A. Lindeman, A. L. Carroll, and J. E. Yack. "Acoustics of the mountain pine beetle (Dendroctonus ponderosae) (Curculionidae, Scolytinae): sonic, ultrasonic, and vibration characteristics." Canadian Journal of Zoology 91, no. 4 (2013): 235–44. http://dx.doi.org/10.1139/cjz-2012-0239.

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Acoustic signaling is widespread in bark beetles (Scolytinae), although little is known about the physical characteristics of signals, how they are transmitted, and how they differ among behavioural contexts. Signals were studied in the male mountain pine beetle (Dendroctonus ponderosae Hopkins, 1902) during stress, male–female, and male–male interactions. Sounds are broadband with significant energy in the ultrasound (peaks between 15 and 26 kHz) and low amplitude (55 and 47 dB SPL at 2 and 4 cm, respectively), indicating that signaling functions at close range. Signal trains vary among conte

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Walz, Henriette, Jan Grewe, and Jan Benda. "Static frequency tuning accounts for changes in neural synchrony evoked by transient communication signals." Journal of Neurophysiology 112, no. 4 (2014): 752–65. http://dx.doi.org/10.1152/jn.00576.2013.

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Although communication signals often vary continuously on the underlying signal parameter, they are perceived as distinct categories. We here report the opposite case where an electrocommunication signal is encoded in four distinct regimes, although the behavior described to date does not show distinct categories. In particular, we studied the encoding of chirps by P-unit afferents in the weakly electric fish Apteronotus leptorhynchus. These fish generate an electric organ discharge that oscillates at a certain individual-specific frequency. The interaction of two fish in communication context

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13

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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14

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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15

Burrows, A. P., J. R. Wright, and J. A. Coote. "Optimal Excitation for Aircraft Flutter Testing." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 209, no. 4 (1995): 313–25. http://dx.doi.org/10.1243/pime_proc_1995_209_306_02.

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The choice of excitation signal for flutter testing of a full-scale aircraft or wind tunnel model is crucial if the flutter test clearance is to be performed quickly and with confidence. The use of chirps (that is, sinusoidal signals with varying frequency) is commonplace but has limitations. In this paper the idea of a simple chirp is extended to the development of a multi-sectional variable amplitude/variable power chirp in which the relative signal amplitude and power between sections may be specified over the frequency range of interest. An optimal chirp for a particular application may th

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16

Dvornikov-jr., S., S. Selivanov, and S. Dvornikov. "Noise Immunity of Binary Chirp Signals." Proceedings of Telecommunication Universities 10, no. 2 (2024): 24–33. http://dx.doi.org/10.31854/1813-324x-2024-10-2-24-33.

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The results of a study of the noise immunity of receiving signals with linear frequency modulation in telecommunication information transmission systems are considered. Analytical expressions for the synthesis of binary signals by linear frequency modulation with control parameters are obtained. The dependence of the structure of linear frequency modulation signals on the shaping parameters has been studied. The optimization problem of finding the maximum value of the Euclidean distance for linear frequency modulation signals of a binary structure has been solved by modeling. Differences have

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Wegehaupt, Abigail K., and William E. Wagner. "Females can solve the problem of low signal reliability by assessing multiple male traits." Biology Letters 13, no. 9 (2017): 20170386. http://dx.doi.org/10.1098/rsbl.2017.0386.

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Male signals that provide information to females about mating benefits are often of low reliability. It is thus not clear why females often express strong signal preferences. We tested the hypothesis that females can distinguish between males with preferred signals that provide lower and higher quality direct benefits. In the field cricket, Gryllus lineaticeps , females usually prefer higher male chirp rates, but chirp rate is positively correlated with the fecundity benefits females will receive from males only for males that have experienced low quality diets. We paired females with muted ma

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18

Wu, Yan Jun, Gang Fu, and Peng Yu. "Performance Analysis on Three Methods for Chirp Signal Parameters Estimation Based on FRFT." Advanced Materials Research 989-994 (July 2014): 3942–45. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.3942.

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Chirp signal has been used widely in radar signals, and the Fractional Fourier transform is one of the most effective tools to analyze Chirp signal. In this paper, the concept of FRFT and the estimation theory of Chirp signal are introduced firstly. Then, we study three Chirp signal detection algorithms based on character of Chirp signal energy concentrated in a certain FRFT domain. Finally, in order to test the estimation abilities of the frequency modulation rate and the central frequency of FRFT to Chirp signal, and compare the operation time of parameters estimation under different SNR of

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19

Tu, Xiaotong, Hao Liang, Andreas Jakobsson, Yue Huang, and Xinghao Ding. "Adaptive sparse estimation of nonlinear chirp signals using Laplace priors." Journal of the Acoustical Society of America 155, no. 1 (2024): 78–93. http://dx.doi.org/10.1121/10.0024248.

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The identification of nonlinear chirp signals has attracted notable attention in the recent literature, including estimators such as the variational mode decomposition and the nonlinear chirp mode estimator. However, most presented methods fail to process signals with close frequency intervals or depend on user-determined parameters that are often non-trivial to select optimally. In this work, we propose a fully adaptive method, termed the adaptive nonlinear chirp mode estimation. The method decomposes a combined nonlinear chirp signal into its principal modes, accurately representing each mod

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Cao, Xinquan, Shiyuan Zhang, Ke Tan, et al. "Signal Processing for Novel Noise Radar Based on de-chirp and Delay Matching." Sensors 24, no. 22 (2024): 7169. http://dx.doi.org/10.3390/s24227169.

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Modern radar technology requires high-quality signals and detection performance. However, traditional frequency-modulated continuous wave (FMCW) radar often has poor anti-jamming capabilities, and the high sampling rates associated with large time-bandwidth product signals can lead to increased system hardware costs and reduced data processing efficiency. This paper constructed a composite radar waveform based on noise frequency modulation (NFM) and linear frequency modulation (LFM) signals, enhancing the signal’s complexity and anti-jamming capability. Furthermore, a method for optimizing the

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21

Adithya valli, N., and Dr D. Elizabath Rani. "Modified PWNLFM Signal for Side-Lobe Reduction." International Journal of Engineering & Technology 7, no. 4.20 (2018): 4. http://dx.doi.org/10.14419/ijet.v7i4.20.22110.

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Many applications in radar systems require low range side-lobe performance which is achieved by pulse compression processing. Most used chirp signal for this processing is linear frequency modulation (LFM) signal but with a presence of first high side-lobe level. Suppression of this side-lobe requires weighting function causing the reduction in signal to noise ratio at the receiver owing to mismatch loss. Non-linear chirp signals are introduced as a solution and became most practiced signals aimed at reducing side-lobes. In this paper, an overall piece wise non-linear frequency modulation chir

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Putera, Bagas Dwi, Erfansyah Ali, Heroe Wijanto, and M. Ramdhani. "Design and Realization of Memory-Based Chirp Generator on Synthetic Aperture Radar (SAR)." Journal of Measurements, Electronics, Communications, and Systems 4, no. 1 (2018): 16. http://dx.doi.org/10.25124/jmecs.v4i1.1695.

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Synthetic Aperture Radar (SAR) is a radar system that uses platform movement combined with signal processing. Eventhough it use a small antenna, SAR produce high resolution as good as a large antenna. In SAR imaging, radar is mounted on a moving platform. It transmits electromagnetic pulses and receives backscattered echo signals. Transmitted pulses are subsequently scattered by earth surface and only small portion of them are received by antenna. SAR transmitted signals normally is a chirp or linear frequency modulation (LFM) signal. Chirp signal can be generated by using the analog and digit

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Djuric, P. M., and S. M. Kay. "Parameter estimation of chirp signals." IEEE Transactions on Acoustics, Speech, and Signal Processing 38, no. 12 (1990): 2118–26. http://dx.doi.org/10.1109/29.61538.

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Пономарчук, Сергей, Sergey Ponomarchuk, Владимир Куркин, Vladimir Kurkin, Максим Пензин, and Maksim Penzin. "Features of backscatter ionospheric sounding as studied with a chirp ionosonde." Solar-Terrestrial Physics 3, no. 3 (2017): 54–60. http://dx.doi.org/10.12737/stp-33201706.

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We present the results of the studies of backscatter ionospheric sounding (BS) on the basis of a multipurpose chirp ionosonde developed in ISTP SB RAS. We analyze BS experimental data obtained during different seasons from 2005 to 2009. The accumulated dataset allows us to investigate features of BS signal propagation in various heliogeophysical conditions. To analyze and interpret BS signals on ionograms, we use the results of modeling of characteristics for chirp signals in the backscatter and oblique ionospheric sounding under a waveguide approach. We have revealed the most characteristic t

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Condon, M., and A. Iserles. "Simulation of nonlinear systems subject to modulated chirp signals." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 34, no. 4 (2015): 1184–90. http://dx.doi.org/10.1108/compel-11-2014-0305.

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Purpose – The purpose of this paper is to apply a novel technique for the simulation of nonlinear systems subject to modulated chirp signals. Design/methodology/approach – The simulation technique is first described and its salient features are presented. Two examples are given to confirm the merits of the method. Findings – The results indicate that the method is appropriate for simulating nonlinear systems subject to modulated chirp signals. In particular, the efficiency and accuracy of the method is seen to improve as the chirp frequency increases. In addition, error bounds are given for th

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Meng, Fan Yu, Xue Mai Gu, and Qing Guo. "An Efficient M-Ary Modulation Technique Using Single Linear Chirp Signal." Advanced Materials Research 462 (February 2012): 492–99. http://dx.doi.org/10.4028/www.scientific.net/amr.462.492.

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In recent years, as the indoor wireless communication has gained increasing attention, various kinds of wireless communication techniques have developed rapidly to obtain a better system performance. Chirp signal is also noticed again due to the feature of low power consumption, high processing gain and low cost. A novel M-ary chirp modulation technique is proposed in this paper to increase the system performance both under AWGN channel and indoor wireless channel. Optimal linear chirp signals are designed in this system to reduce the cross correlation, and simplify the complexity of the syste

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Liu, Guikun, Liang Li, Feng Ming, Xilong Sun, and Jun Hong. "A Controllable Suppression Jamming Method against SAR Based on Active Radar Transponder." Remote Sensing 14, no. 16 (2022): 3949. http://dx.doi.org/10.3390/rs14163949.

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A chirp-mismatch echo signal can be generated by exchanging the I and Q baseband signals of a received SAR signal. In this paper, the basic generation principles of a chirp-mismatch echo signal are analyzed. Then, a suppression jamming method with controllable jamming position and coverage area is proposed. This method firstly performs chirp-mismatch processing on the received SAR signals, then controls the range jamming coverage and center position through range shift-frequency modulation and time delay, and controls the azimuth jamming coverage and center position through motion modulation a

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Horai, Mio, Hideo Kobayashi, and Takashi G. Nitta. "Chirp Signal Transform and Its Properties." Journal of Applied Mathematics 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/161989.

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The chirp signalexp(iπ(x-y)2)is a typical example of CAZAC (constant amplitude zero autocorrelation) sequence. Using the chirp signals, the chirp z transform and the chirp-Fourier transform were defined in order to calculate the discrete Fourier transform. We define a transform directly from the chirp signals for an even or odd numberNand the continuous version. We study the fundamental properties of the transform and how it can be applied to recursion problems and differential equations. Furthermore, whenNis not prime and N=ML, we define a transform skippedLand develop the theory for it.

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Zhuang, Louise L., Jeremy Dahl, Howard Zebker, and Marko Jakovljevic. "Rapid beamforming of ultrasound chirp signals in frequency domain using the chirp scaling algorithm." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A242. http://dx.doi.org/10.1121/10.0018774.

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Linear frequency-modulated (chirp) transmits have been used successfully in the past to increase penetration depth of ultrasound signals in tissue and to improve the signal-to-noise ratio (SNR) in the resulting ultrasound images. However, beamforming chirp signals using delay-and-sum (DAS) can be slow on systems without a GPU. We propose using the chirp scaling algorithm (CSA), originally developed for synthetic aperture radar, as a faster alternative to DAS on CPU that results in similar image quality, especially at larger depths. To perform preliminary comparisons of the beamforming methods,

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Wang, Junyuan, Huihui He, Zhijian Wang, Wenhua Du, Nengquan Duan, and Ziying Zhang. "Application of Optimized Adaptive Chirp Mode Decomposition Method in Chirp Signal." Applied Sciences 10, no. 11 (2020): 3695. http://dx.doi.org/10.3390/app10113695.

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The adaptive chirp mode decomposition method has a good effect on processing chirp signals. The parameter α controls the smoothness of the output signal. Too small an α will cause a smooth output signal. The parameter β controls the instantaneous frequency (IF). If too small a β value is used, the output IF will be very smooth. However, rapidly changing IFs require a relatively large β. However, the choice of α,β is artificially set, and there are errors in practical applications. Therefore, it employs the state transition algorithm to adaptively optimize α,β to improve the signal-to-noise rat

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Alshaykh, Mohammed S. "Generating Large Time–Bandwidth Product RF-Chirped Waveforms Using Vernier Dual-Optical Frequency Combs." Photonics 12, no. 7 (2025): 700. https://doi.org/10.3390/photonics12070700.

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Chirped radio-frequency signals are essential waveforms in radar systems. To enhance resolution and improve the signal-to-noise ratio through higher energy transmission, chirps with high time–bandwidth products are highly desirable. Photonic technologies, with their ability to handle broad electrical bandwidths, have been widely employed in the generation, filtering, processing, and detection of broadband electrical waveforms. In this work, we propose a photonics-based large-TBWP RF chirp generator utilizing dual optical frequency combs with a small difference in the repetition rate. By employ

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Rabiee, N., H. Azad, and N. Parhizgar. "Exploiting Chirp Rate Estimation Methods to Improve Image Formation Quality of Synthetic Aperture Radar." International Journal of Aerospace Engineering 2021 (September 28, 2021): 1–13. http://dx.doi.org/10.1155/2021/6636286.

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A common assumption in SAR image formation and processing algorithms is that the chirp rates of the transmitted and received radar signals are exactly the same. Dechirp processing is also done based on this common assumption. In real scenarios, the chirp rate of the received signal is different from that of the transmitted signal due to several reasons. In case the difference between the chirp rates of the transmitted and received signals is obvious, the demodulation and compression of the received pulse are not carried out precisely and defocusing the targets and the output images of the SAR

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Dmitriev, D. V., and V. S. Polishkarov. "Formation of the Sounding Signal of an Orbital Radio Altimeter." Rocket-space device engineering and information systems 9, no. 1 (2022): 67–72. http://dx.doi.org/10.30894/issn2409-0239.2022.9.1.67.72.

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The accuracy of the formation of sounding signals of quasi-continuous radars is determined by the requirements for the permissible instrumental component of the error in measuring of the distance and Doppler frequency shift. High-precision orbital radio altimeters, as a rule, use precision signals with linear frequency modulation (chirp signals) as sounding signals, the linearity characteristics of which are quite demanding, since deviations from the linear law of change in the frequency of the radio altimeter sounding signal cause additional measurement errors. To reduce the instrumental erro

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Liu, Gaogao, Ziyu Huang, Qidong Zhang, Beibei Mu, and Hongfu Guo. "Joint Radar Jamming and Communication System Design Based on Universal Filtered Multicarrier Chirp Waveform." Remote Sensing 16, no. 8 (2024): 1383. http://dx.doi.org/10.3390/rs16081383.

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In this article, we propose a joint waveform based on universal filtered multicarrier (UFMC) chirp for radar jamming and communication joint systems. Modulation of radar jamming chirp signals and communication signals on different subcarrier groups in the UFMC sub-band is used to achieve the waveform design. The jamming signal in the waveform contains a frequency shift coefficient that depends on the delay time, which can effectively improve the anti-frequency hopping ability and enhance the overall jamming efficiency. Simultaneously jamming signals can provide assistance in channel estimation

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Kundlia, Anmol. "Multiple Target Localization Using Wideband Echo Chirp Signals." Mathematical Statistician and Engineering Applications 70, no. 1 (2021): 253–60. http://dx.doi.org/10.17762/msea.v70i1.2306.

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This work proposes a unique technique for wideband chirp signals-based detection and estimate of the range, velocity, and direction of arrival (DOA) of numerous far-field objects. A wide region is covered by the wideband signal that is created. The targets reflect them, and an echo signal is created. The range, radial velocity, as well as DOA of the echo signal are extracted to identify the objects. Using the LCT, the range, radial velocity, and DOA are determined. The main goals of the system under consideration are to transmit a wide band signal over an area, to detect targets nearby, to obt

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Buhaiov, M. V., and S. P. Samoilyk. "RANGE AND RADIAL VELOCITY MEASUREMENT AMBIGUITY ELIMINATION WITH TRAINS OF MULTICOMPONENT SIGNALS." Проблеми створення, випробування, застосування та експлуатації складних інформаційних систем, no. 18 (December 30, 2020): 91–100. http://dx.doi.org/10.46972/2076-1546.2020.18.09.

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When designing pulse-Doppler radar, one of the key points is the choice of the pulse repetition period, which determines the boundaries of unambiguous measurement of range and radial velocity and creates contradictions in the measurement of these values. This contradiction is especially acute in the analysis of signals reflected from the propellers and turbines of aircraft. The main approaches to solving the problem of expanding the boundaries of unambiguous measurement of range and radial velocity is the use of variable pulse repetition period and the creation of signal ensembles to separate

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Lu, Xiang, Volker Pickert, Maher Al-Greer, Cuili Chen, Xiang Wang, and Charalampos Tsimenidis. "Temperature Estimation of SiC Power Devices Using High Frequency Chirp Signals." Energies 14, no. 16 (2021): 4912. http://dx.doi.org/10.3390/en14164912.

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Silicon carbide devices have become increasingly popular in electric vehicles, predominantly due to their fast-switching speeds, which allow for the construction of smaller power converters. Temperature sensitive electrical parameters (TSEPs) can be used to determine the junction temperature, just like silicon-based power switches. This paper presents a new technique to estimate the junction temperature of a single-chip silicon carbide (SiC) metal–oxide–semiconductor field-effect transistor (MOSFET). During off-state operation, high-frequency chirp signals below the resonance frequency of the

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Zhao, Ziyue, and Congfeng Liu. "Joint Estimation of Time-Frequency Signature and DOA Based on STFD for Multicomponent Chirp Signals." International Scholarly Research Notices 2014 (November 9, 2014): 1–6. http://dx.doi.org/10.1155/2014/937139.

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In the study of the joint estimation of time-frequency signature and direction of arrival (DOA) for multicomponent chirp signals, an estimation method based on spatial time-frequency distributions (STFDs) is proposed in this paper. Firstly, array signal model for multicomponent chirp signals is presented and then array processing is applied in time-frequency analysis to mitigate cross-terms. According to the results of the array processing, Hough transform is performed and the estimation of time-frequency signature is obtained. Subsequently, subspace method for DOA estimation based on STFD mat

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Fu, Gang, Yan Jun Wu, and Hua Tang Tao. "A New Method of Multi-Component Chirp Signal Array Detection." Advanced Materials Research 989-994 (July 2014): 3977–80. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.3977.

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This paper presents a multi-component chirp signal detection with new methods of parameter estimation. The method using spatial characteristics of the antenna array. By array average fractional Fourier domain weighting function is introduced to reduce noise and suppress mutual interference between the signals from different sources. And compared to a single array element method. The proposed method greatly improves the multi-component chirp signal detection and parameter estimation performance. Simulation results show the effectiveness of the method.

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Khramov, Konstantin, Sergey Zhiganov, Mikhail Smirnov, and Elena Zhiganova. "Analysis of the effectiveness of using complex probing signals to range ambiguity suppression in space monitoring systems." E3S Web of Conferences 592 (2024): 06007. http://dx.doi.org/10.1051/e3sconf/202459206007.

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To improve the range resolution, it is necessary to expand the capture band. However, this leads to range ambiguity interference. This problem is especially serious in space view systems. Therefore, methods of reduction of ambiguity interference are an important part of the information processing system. In modern SAR systems, chirp signals are usually used as probing signals. However, other broadband signals with frequency modulation or PSK signals with different laws of intra-pulse modulation can be used to obtain a radar image. The aim of the work is to analyze the effectiveness of using co

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Anger, Simon, Matthias Jirousek, Stephan Dill, and Markus Peichl. "Inverse Synthetic Aperture Radar Imaging of Space Targets Using Wideband Pseudo-Noise Signals with Low Peak-to-Average Power Ratio." Remote Sensing 16, no. 10 (2024): 1809. http://dx.doi.org/10.3390/rs16101809.

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With the number of new satellites increasing dramatically, comprehensive space surveillance is becoming increasingly important. Therefore, high-resolution inverse synthetic aperture radar (ISAR) imaging of satellites can provide an in-situ assessment of the satellites. This paper demonstrates that pseudo-noise signals can also be used for satellite imaging, in addition to classical linear frequency-modulated chirp signals. Pseudo-noise transmission signals offer the advantage of very low cross-correlation values. This, for instance, enables the possibility of a system with multiple channels tr

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Yin, Zhi Hao, Ben Cheng Yu, Zhi Feng Wang, and Yong Yang. "Performance Analysis of Radar Pulse Compression Signals." Advanced Materials Research 734-737 (August 2013): 3248–51. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.3248.

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In order to enhance the resistance to interference of radar, introduced chirp and chaos BPSK two pulse compression signals principles, has analyzed the respective signal characteristics. Based on MATLAB simulation, from 5 aspect analysis and comparisons the performance of these two radar pulse compression signals. The results show that when these two pulse pressure signals can meet is big request of wide band width, the signal after pulse pressure have the ratio of high.

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Stöckl, Anna, Fabian Sinz, Jan Benda, and Jan Grewe. "Encoding of social signals in all three electrosensory pathways of Eigenmannia virescens." Journal of Neurophysiology 112, no. 9 (2014): 2076–91. http://dx.doi.org/10.1152/jn.00116.2014.

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Extracting complementary features in parallel pathways is a widely used strategy for a robust representation of sensory signals. Weakly electric fish offer the rare opportunity to study complementary encoding of social signals in all of its electrosensory pathways. Electrosensory information is conveyed in three parallel pathways: two receptor types of the tuberous (active) system and one receptor type of the ampullary (passive) system. Modulations of the fish's own electric field are sensed by these receptors and used in navigation, prey detection, and communication. We studied the neuronal r

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Oleg, V. Chernoyarov, A. Ivanov Vladimir, V. Salnikova Alexandra, and A. Slepneva Marina. "Intra-Period Signal Processing in a Synthetic Aperture Radar." Engineering Letters 30, no. 1 (2022): 66–72. https://doi.org/10.5281/zenodo.7562049.

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One introduces a technique for solving the problem of a synthetic aperture radar tracking when the model of the reflected signal in the form of a discrete normal random process is applied. It is shown that, in a general case, the optimal processing of the signals reflected from the resolved surface element should consist in multichannel linear filtering using the weight coefficients that are generated accounting for the correlation properties of the reflected signal and the receiver noise. The processing procedure should also include the calculation of the linear filter output signal power, fo

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Mohammed, Jawad Al-Dujaili, and Majeed Al-Awadi Aws. "Chirplet signal design by FPGA." International Journal of Electrical and Computer Engineering (IJECE) 11, no. 3 (2021): 2120–27. https://doi.org/10.11591/ijece.v11i3.pp2120-2127.

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The ever-expanding growth of the electronics and communications industries present new challenges for researchers. One of these challenges is the generation of the required bandwidth signal over a specific time frame that is used in a variety of contexts, particularly radar systems. To improve the range resolution in the radar along with better SNR, it is necessary to reduce the signal bandwidth and increase the peak power. There are some restrictions for narrowband signals like power limitation, pulse shaping, and the production of unwanted harmonics. So as a solution pulse compression techni

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Podlesnyi, Aleksey, Aleksey Naumenko, and Mark Cedrik. "ESTIMATING ANTENNA COUPLING FACTOR FOR PROBLEM OF TOPSIDE IONOSPHERE SOUNDING FROM SPACE BY CHIRP SIGNALS." Solar-Terrestrial Physics 5, no. 4 (2019): 101–7. http://dx.doi.org/10.12737/stp-54201914.

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When developing the first topside ionosphere sounding stations, the issue was debated concerning the improvement of the electromagnetic compatibility of such devices through the use of chirp signals. One of the main problems of using chirp signals was the impossibility of ensuring simultaneous operation of receiver and transmitter. The article presents the results of the use of receiving and transmitting dipole antennas with a common center for sounding the ionosphere by a chirp signal. Conclusions are drawn about the possibility of using such facilities for sounding the external ionosphere wi

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Zhu, Lei. "Quadratic Frequency Modulation Signals Parameter Estimation Based on Product High Order Ambiguity Function-Modified Integrated Cubic Phase Function." Information 10, no. 4 (2019): 140. http://dx.doi.org/10.3390/info10040140.

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In inverse synthetic aperture radar (ISAR) imaging system for targets with complex motion, such as ships fluctuating with oceanic waves and high maneuvering airplanes, the multi-component quadratic frequency modulation (QFM) signals are more suitable model for azimuth echo signals. The quadratic chirp rate (QCR) and chirp rate (CR) cause the ISAR imaging defocus. Thus, it is important to estimate QCR and CR of multi-component QFM signals in ISAR imaging system. The conventional QFM signal parameter estimation algorithms suffer from the cross-term problem. To solve this problem, this paper prop

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Horbatyi, Ivan, and Oleksandr Usatyi. "INVESTIGATION OF SPREAD SPECTRUM SIGNAL ANALYSIS METHODS IN MODERN COMMUNICATION SYSTEMS." Information and communication technologies, electronic engineering 5, no. 1 (2025): 125–35. https://doi.org/10.23939/ictee2025.01.125.

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The article examines modern approaches to the analysis of spread spectrum signals, particularly those based on pseudorandom frequency hopping and chirp spectrum expansion. The main focus is on the development and optimization of efficient time-frequency analysis methods for the identification and monitoring of such signals under real-world conditions, considering their complexity and dynamic nature. Special attention is given to the application of methods that ensure high accuracy, efficiency, and resistance to interference, which is extremely important in environments with high radio frequenc

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Zhou, Jing Lei, and Fan Wang. "Chirp Signal Time-Frequency Analysis Characteristic Comparison." Applied Mechanics and Materials 226-228 (November 2012): 568–71. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.568.

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Chirp signal is a typical non-stationary signal, and have been widely used in communication, sonar, radar and so on. So, this signal is worth to analysis. In order to show the characteristics, this paper first introduces the definition and formula of each algorithm, then with all kinds of time-frequency analysis method to the signals, and the signal to add two sine signal noise are analyzed, the comparison of the characteristics of the method in the paper, and the signal for the analysis, the selection of an appropriate analysis. Through analysis and comparison, when dealing with the signal, H

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Chen, Na, Yang Jiang, Xiaohong Lan, et al. "A Parabolic Waveform Generator Based on the Chirp Characteristics of a Directly Modulated Laser." Photonics 11, no. 1 (2023): 4. http://dx.doi.org/10.3390/photonics11010004.

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Due to carrier dynamics, the modulated light field from a directly modulated laser (DML) has an intensity envelope with a certain frequency chirp. When the chirp is linearly mapped into intensity by a frequency discriminator such as an optical filter with a linear edge, the optical field presents a new signal determined by the multiplication operation between the envelope function and the chirp function. Under a triangular drive signal, this process can contribute dark, bright and frequency-doubled bright parabolic waveforms by properly adjusting the filter window. This method is verified by b

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