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High-Precision DOA Estimation Method Based on Synthetic Aperture Technique

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Journal of Beijing Institute of Technology 2024年第2期33卷 111-118页

作者： Yongjia Dou Guangcai Sun Yuqi Wang Mengdao Xing national Key laboratory of radar signal processing Xidian UniversityXi’an 710071China School of Communication and Information Engineering Xi’an University of Science and TechnologyXi’an 710054China

The existing direction-of-arrival(DOA)estimation methods only utilize the current received signals,which are susceptible to *** this paper,a method for DOA estimation based on a motion platform is proposed to achieve high-precision DOA estimation by utilizing past and present *** concept of synthetic aperture is introduced to construct a linear DOA estima-tion model.A DOA fine-tuning method based on the linear model is proposed to eliminate the lin-ear DOA variation,achieving a non-coherent accumulation of DOA ***,the baseband modulation and the phase modulation caused by the range history are compensated to achieve the coherent accumulation of all the DOA *** results show that the proposed method can significantly improve the DOA estimated accuracy at low signal-to-noise ratios(SNR).

关键词： synthetic aperture direction-of-arrival(DOA)estimation coherent accumulation

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Persymmetric adaptive polarimetric detection of subspace range-spread targets in compound Gaussian sea clutter

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Journal of Systems Engineering and Electronics 2024年第1期35卷 31-42页

作者： XU Shuwen HAO Yifan WANG Zhuo XUE Jian national Key laboratory of radar signal processing Xidian UniversityXi’an 710071China Xi’an Electronic Engineering Research Institute Xi’an 710100China Beijing Institute of Radio Measurement Beijing 100039China School of Communications and Information Engineering Xi’an University of Posts and TelecommunicationsXi’an 710121China

This paper focuses on the adaptive detection of range and Doppler dual-spread targets in non-homogeneous and nonGaussian sea *** sea clutter from two polarimetric channels is modeled as a compound-Gaussian model with different parameters,and the target is modeled as a subspace rangespread target *** persymmetric structure is used to model the clutter covariance matrix,in order to reduce the reliance on secondary data of the designed *** adaptive polarimetric persymmetric detectors are designed based on the generalized likelihood ratio test(GLRT),Rao test,and Wald *** the proposed detectors have constant falsealarm rate property with respect to the clutter texture,the speckle covariance *** results on simulated and measured data show that three adaptive detectors outperform the competitors in different clutter environments,and the proposed GLRT detector has the best detection performance under different parameters.

关键词： sea clutter adaptive polarimetric detection compound Gaussian model subspace range-spread target persymmetric structure

Interference mitigation and target detection for automotive FMCW radar with range-Doppler sparse regularization

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Science China(Information Sciences) 2024年第9期67卷 342-343页

作者： Yan HUANG Yunxuan WANG Xiao ZHOU Hui ZHANG Yuan MAO Guisheng LIAO Wei HONG State Key Lab of Millimeter Waves Southeast University Department of Computer Science University College London national Key Lab of radar signal processing Xidian University

The invention of vehicles has shaped our modern society and accelerated our economy while causing many tragic incidents simultaneously. Some advanced driver-assistance systems(ADAS) based on surrounding environment sensors are widely applied and installed in modern vehicles to avoid possible casualty and property loss.

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Synthetic Aperture Positioning: A Review

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Journal of Beijing Institute of Technology 2024年第2期33卷 89-102页

作者： Guangcai Sun Wenlong Dong Yuqi Wang Mengdao Xing national Key laboratory of radar signal processing Xidian UniversityXi’an 710071China School of Communication and Information Engineering Xi’an University of Science and TechnologyXi’an 710054China national Key laboratory of radar signal processing and the Academy of Advanced Interdisciplinary Research DepartmentXidian UniversityXi’an 710071China

Obtaining precise position of interested emitters passively has wide applications in both civilian and military *** from traditional parameter measurement and direct position determination(DPD)method,recently a new passive localization method based on synthetic aper-ture technique,named synthetic aperture positioning(SAP),has been *** method com-pensates for the nonlinear phase produced by relative motion between the moving platform and the emitter,achieving coherent summation of intercepted *** SAP can obtain high-resolution and high-precision localization results at a low signal-to-noise *** paper summarizes the research progress of SAP,including localization principles,spaceborne applications,and application scope ***,the possible future outlook of SAP is considered.

关键词： passive localization synthetic aperture positioning coherent processing

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Detection of UAV Target Based on Continuous Radon Transform and Matched Filtering Process for Passive Bistatic radar

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Journal of Beijing Institute of Technology 2024年第1期33卷 9-18页

作者： Luo Zuo Yuefei Yan Jun Wang Xin Sang Yan Wang Dongming Ge Lihao Ping Zhihai Wang Congsi Wang Guangzhou Institute of Technology Xidian UniversityGuangzhou 510555China national laboratory of radar signal processing Xidian UniversityXi’an710071China School of Information and Control Engineering Xi’an University of Architecture and TechnologyXi’anShaanxi 710055China CETC Wuhu Diamond Aircraft Manufacturing Co. LtdWuhuAnhui 241000China Beijing Space Vehicle General Design Department Beijing 100094China CETC No.38 Research Institute Hefei 230088China

Long-time integration technique is an effective way of improving target detection performance for unmanned aerial vehicle(UAV)in the passive bistatic radar(PBR),while range migration(RM)and Doppler frequency migration(DFM)may have a major effect due to the target *** paper proposed an innovative long-time coherent integration approach,regarded as Continuous Radon-matched filtering process(CRMFP),for low-observable UAV target in passive bistatic *** not only mitigates the RM by collaborative research in range and velocity dimensions but also compensates the DFM and ensures the coherent integration through the matched filtering process(MFP).Numerical and real-life data following detailed analysis verify that the proposed method can overcome the Doppler mismatch influence and acquire comparable detection performance.

关键词： passive bistatic radar unmanned aerial vehicle long-time coherent integration Radon-matched filtering process

Range-angle-dependent beamforming for FDA-MIMO radar using oblique projection

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Science China(Information Sciences) 2022年第5期65卷 223-241页

作者： Lan LAN Guisheng LIAO Jingwei XU Shengqi ZHU Yuhong ZHANG national Key laboratory of radar signal processing Xidian University School of Electronic Engineering Xidian University

Frequency diverse array(FDA)-multiple-input and multiple-output(MIMO) radar is characterized with a range-angle-dependent transceive beampattern by introducing incremental frequencies among the transmit array elements and separating the transmitted waveforms with matched filtering in the receiver. In this respect, the paper aims to control the range-angle-dependent transceive beampattern for FDA-MIMO radar by designing the weight vector according to the desired response. At the design stage, the weight vectors to control the beampattern responses of different regions are devised by performing the orthogonal decomposition technique. Then, a filtering matrix using the oblique projection operator is constructed to filter the weight vectors for different regions, where two iterative algorithms are developed either considering concurrent or successive control of multiple regions. In such a way, a desired range-angle-dependent transceive beampattern is formed with simultaneously broadened nulls and a flat-top mainlobe. At the analysis stage,the method has been applied to interference mitigation in FDA-MIMO radar, where the mismatch exists both in the sidelobes and mainlobe. Simulated and measured results are provided to corroborate the effectiveness of the proposed methods.

关键词： FDA-MIMO radar range-angle-dependent beamforming weight vector orthogonal decomposition oblique projection interference mitigation

Ambiguity function analysis and side peaks suppression of Link16 signal based passive radar

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Journal of Systems Engineering and Electronics 2023年第6期34卷 1526-1536页

作者： BAI Luyang WANG Jun CHEN Xiaoling national Key laboratory of radar signal processing Xidian UniversityXi’an 710071China

Link16 data link is the communication standard of the joint tactical information distribution system(JTIDS)used by the *** and North Atlantic Treaty Organization,which is applied as the opportunistic illuminator for passive radar in this *** time-domain expression of the Link16 signal is established,and its ambiguity function expression is *** timedelay dimension and Doppler dimension side peaks of which lead to the appearance of the false target during target *** solve the problem,the time-delay dimension and Doppler dimension side peaks suppression methods are *** the problem that the conventional mismatched filter(MMF)cannot suppress the time-delay dimension side peaks,a neighborhood MMF(NMMF)is *** results demonstrate the effectiveness of the proposed methods.

关键词： passive radar ambiguity function Link16 mismatched filter(MMF)

Control and utilization of range-dependent beampattern with waveform diverse array radars

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Chinese Journal of Aeronautics 2022年第12期35卷 1-31页

作者： Lan LAN Guisheng LIAO Jingwei XU Shengqi ZHU Cao ZENG Yuhong ZHANG national Key laboratory of radar signal processing Xidian UniversityXi’an 710071China School of Electronic Engineering Xidian UniversityXi’an 710071China

The transmit antenna beampattern of the phased array radar is only a function of angle,limiting its ability to discriminate the targets from the same ***,the waveform diverse array radars expand the angle-dependent beampattern to an angle-time-range-dependent three-dimensional function by modulating the frequencies/time delays/phases across different transmit antenna *** this respect,extra Degrees-of-Freedom(DOFs)in the range domain are achieved,which opens up an innovative way to fulfil the tasks with enhanced system performance by jointly using the angle and range *** paper summaries the developments of waveform diverse radars,including the Frequency Diverse Array(FDA),the Space-Time-CirculatingArray(STCA),and the Element-Pulse-Coding(EPC)frameworks,with emphasis on the analysis of the range-dependent beampattern from the basic properties upon how it is ***,the most recent advances of utilizing such a range-dependent beampattern in target detection,parameter estimation and identifiability,clutter suppression,jammer suppression and Synthetic Aperture radar(SAR)imaging are discussed.

关键词： Jammer suppression Parameter estimation Range-dependent beampattern SAR imaging Waveform diverse array rada

Sub-Nyquist radar receiver based on photonics-assisted compressed sensing and cascaded dictionaries

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Chinese Optics Letters 2024年第1期22卷 159-163页

作者：刘诗扬陈阳 Shanghai Key laboratory of Multidimensional Information processing East China Normal UniversityShanghai 200241China Engineering Center of SHMEC for Space Information and GNSS East China Normal UniversityShanghai 200241China

A sub-Nyquist radar receiver based on photonics-assisted compressed sensing is *** dictionaries are applied to extract the delay and the Doppler frequency of the echo signals,which do not need to accumulate multiple echo periods and can achieve better Doppler *** experiment is *** echoes with different delays and Doppler frequencies are undersampled and successfully reconstructed to obtain the delay and Doppler information of the *** results show that the average reconstruction error of the Doppler frequency is 5.33 kHz using an 8-μs radar signal under the compression ratio of *** proposed method provides a promising solution for the sub-Nyquist radar receiver.

关键词： compressed sensing dictionary learning sub-Nyquist radar microwave photonics Doppler frequency