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IET International Radar Conference 2015

作者： Ren, Xiao-Yuan Liu, Hai-Bo Li, Jin-Bing School of Information and Electronics Beijing Institute of Technology Beijing100081 China Beijing Key Laboratory of Embedded Real-Time Information Processing Technology China

ISBN: (纸本)9781849199940

High resolution medium penetrating imaging radar is a kind of important equipment which can be widely used in military, security, construction and other fields. For the sake of imaging the target buried in the medium fast and in high resolution, this paper analyzes the theory of high resolution medium penetrating imaging, proposes two dimensional fast scan method which combine column staggered array antenna with lead rail, presents the process of near field synthetic aperture imaging and structure of the prototype. In the end, the result of imaging test of the prototype is given. The prototype can penetrate 2.5cm board and image the small target, the imaging resolution is better than 1cm.

关键词： Radar imaging

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Research on amplitude-phase error for LFMCW radar

Research on amplitude-phase error for LFMCW radar

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IET International Radar Conference 2015

作者： Mei, Maokui Tian, Weiming Yin, Lilei Zeng, Tao School of Information and Electronics Beijing Institute of Technology Beijing100081 China Beijing Key Laboratory of Embedded Real-Time Information Processing Technology China

ISBN: (纸本)9781849199940

FMCW radar with deramping technique has many advantages comparing to traditional pulse radar. But the expressing of signal error becomes more complicated. The distortions on amplitude and phase are unavoidable for wide bandwidth and wide pulse signal, which have a serious impact on the imaging quality. Aiming at the problem of signal error correction, the echo signal model of FMCW radar with amplitude-phase error was established in this paper. The analysis of error estimation and correction were investigated in detail especially for non-linear phase error. And a practical solution was presented to reduce the effects from the distortions. The processing and results were proved through theoretical derivation and simulation analysis validation. And this method has significantly improved the range resolution and calibrated the position deviation. Additionally, this algorithm has a strong practicability, due to considering both the indicator and real-time imaging processing algorithm costs.

关键词： Error correction

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TOA estimation for unkonwn signal under low SNR condition based on accumulation

TOA estimation for unkonwn signal under low SNR condition ba...

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IET International Radar Conference 2015

作者： Xu, J.C. Ren, L.X. Jiang, Z.Y. Mao, E.K. Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing China School of Information and Electronics Beijing Institute of Technology Beijing China

ISBN: (纸本)9781785610387

This paper presents a novel low complexity TOA estimation method for unknown signal under low SNR condition, especially for inner-pulse modulated signal. In this new method, received signal is firstly pre-processed by multiplying its delayed conjugation to reduce intra-pulse modulation. Then a refined coherent accumulation is applied to achieve a precise TOA estimation result. Simulation results show that this new method can achieve an accurate TOA estimation for unknown signal under low SNR condition.

关键词： Coherent accumulation Multiplication with delayed conjugation TOA estimation

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Mutual information Optimization Based Dynamic Log-Polar Image Registration

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Journal of Shanghai Jiaotong university(Science) 2015年第1期20卷 61-67页

作者：张葵张晓龙徐新付晓薇 Hubei Province Key Laboratory of Intelligent Information Processing and Real-time Industrial System College of Computer Science and Technology Wuhan University of Science and Technology

Log-polar transformation(LPT)is widely used in image registration due to its scale and rotation invariant *** LPT,rotation and scale transformation can be made into translation displacement in log-polar coordinates,and phase correlation technique can be used to get the *** LPT based image registration,constant samples in digitalization processing produce less precise and effective ***,dynamic log-polar transformation(DLPT)is used in this *** is a method that generates several sample sets in axes to produce several results and only the effective results are used to get the final results by using statistical ***,DLPT can get more precise and effective transformation results than the conventional *** information(MI)is a similarity measure to align two images and has been used in image registration for a long *** optimal transform for image registration can be obtained by maximizing MI between the two *** registration based on MI is robust in noisy,occlusion and illumination changing *** this paper,we study image registration using MI and *** with digitalizing images and with real image datasets are performed,and the experimental results show that the combination of MI with DLPT is an effective and precise method for image registration.

关键词： image registration mutual information(MI) log-polar transformation(LPT) phase correlation technique

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A clutter suppression method of ground penetrating radar for detecting shallow surface target

A clutter suppression method of ground penetrating radar for...

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IET International Radar Conference 2015

作者： Wang, Xun Liu, Hai-Bo Meng, Zheng School of Information and Electronics Beijing Institute of Technology Beijing100081 China Beijing Key Laboratory of Embedded Real-Time Information Processing Technology China

ISBN: (纸本)9781849199940

GPR for detecting shallow surface target has heavy clutter and target echo cannot be distinguished easily. This paper proposes a PCA-SVD mixed clutter suppression method to realize dimension reduction and reconstruction, which can improve the performance of clutter suppression effectively. SVD processing remove direct wave, firstly. Then PCA remove uncancelled clutter and remove noise. At last, we design an experiment to validate the performance of clutter suppression.

关键词： Ground penetrating radar systems

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Repeat-pass space-surface bistatic SAR tomography:accurate imaging and first experiment

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Science China(information Sciences) 2024年第9期67卷 245-262页

作者： Zhiyang CHEN Yuanhao LI Cheng HU Shenglei WANG Xinpeng CHEN Mihai DATCU Andrea Virgilio MONTI-GUARNIERI Radar Technology Research Institute School of Information and Electronics Beijing Institute of Technology Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing Institute of Technology Advanced Technology Research Institute Beijing Institute of Technology CEOSpace Tech University Politehnica of Bucharest Dipartimento di Elettronica Informazione e Bioingegneria Politecnico di Milano

Space-surface bistatic synthetic aperture radar(SS-BiSAR) offers an additional observation angle for monostatic spaceborne SAR, making it a promising technology for high-accuracy deformation retrieval technology in local regions. Repeat-pass SS-BiSAR tomography can accurately estimate the surfaces of buildings and steep areas, effectively removing terrain phases during deformation retrieving. However, inaccuracies in the orbital ephemeris can lead to image geometry distortion, reducing image pair coherence,introducing interferometric phase errors, and consequently deteriorating tomographic precision. This paper precisely models the image geometry distortion and interferometric phase error caused by repeat-pass ephemeris error. We propose an ephemeris correction method based on the chirp-Z transform to address these issues. Furthermore, we introduce an accurate tomography model to improve 3D reconstruction *** first SS-BiSAR tomography experiment, conducted using the Chinese Lutan-1 satellite, demonstrates that the correlation coefficient is improved by 0.16 after ephemeris error correction. Moreover, the density and precision of the tomographic point cloud are improved by 13.7% and 12.1%, respectively.

关键词： space-surface SAR tomography orbit error image distortion Lutan-1

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An Efficient Transposition Method for Spaceborne SAR Data Based on HBM 2

An Efficient Transposition Method for Spaceborne SAR Data Ba...

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2nd IEEE International Conference on Signal, information and Data processing, ICSIDP 2024

作者： Li, Yongrui Lv, HuShan Xu, Ming Chen, Liang Yang, Zhu Xie, Yizhuang Beijing Institute of Technology Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Radar Technology Research Institute Beijing China

ISBN: (纸本)9798331515669

The onboard real-time processing of Spaceborne synthetic aperture radar (SAR) is of great significance for the rapid acquisition of surface information. As a key step of SAR imaging processing, the efficiency of data transposition directly affects the imaging quality and processing speed. In order to solve the problem of traditional double data rate synchronous dynamic random-access memory (DDR SDRAM) limiting the transposition speed, this paper proposes a SAR data transposition method based on high bandwidth memory (HBM). The method makes full use of the high bandwidth and multichannel characteristics of HBM, and significantly improves the transposition speed by optimising the data read/write process, providing a new solution for real-time imaging processing of satellite-borne SAR. © 2024 IEEE.

关键词： Dynamic random access storage

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Adaptive Mainlobe Interference Suppression in Sparse Distributed Array Radar Based on Synthetic Wideband Signal 2nd

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2nd International Conference on Machine Learning and Intelligent Communications, MLICOM 2017

作者： Luo, Jian Zhang, Honggang Song, Yuanyuan Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Radar Research Laboratory School of Information and Electronics Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9783319734460

This paper proposes a mainlobe interference suppression method in distributed array radar (DAR) based on stepped frequency synthetic wideband signal. Due to the equivalent large aperture of DAR, it is possible to cancel the mainlobe interference without target signal suppression. The applying of stepped frequency synthetic wideband signal can avoid the different time delays arriving at each array compared with the traditional instantaneous wideband Chirp (linear frequency modulation) signal. Moreover, it can reduce the computational complexity. This method employs the narrowband adaptive processing to each sub-pulse of the stepped frequency signal, and then synthesizes the high resolution range profile (HRRP). As a result, mainlobe interference suppression under wideband signal is accomplished. Mainlobe interference suppression experiment is carried out by using an S-band experimental radar system, an S-band noise jammer and a target simulator. The measured data is processed employing the proposed method, and the result verifies the effectiveness of this algorithm. © 2018, ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering.

关键词： Beamforming

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Design of a large point FFT processor with configurable transform length

Design of a large point FFT processor with configurable tran...

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IET International Radar Conference 2015

作者： Xie, Yu Feng, Yang-Kai Yang, Chen Xie, Yi-Zhuang Chen, He Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing Institute of Technology Shanghai Institute of Satellite Engineering Beijing China

ISBN: (纸本)9781849199940

In this paper, a scheme of a large point FFT processor with configurable transform length is proposed. To achieve a pipelined structure, the proposed scheme is designed by Radix-2 decimation-in-frequency (DIF) FFT algorithm with Single-path Delay Feedback (SDF) architecture. A prototype is implemented on Xilinx Virtex-7 XC7VX690T FPGA, which can compute 16∼128K FFT at a speed as high as *** scheme is superior to existing technologies, due to its ability to process a continuous-flow input sequence and its prospect for real-time, configurable transform length applications.

关键词： Field programmable gate arrays (FPGA)

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The method of multi-channel phased array radar squint SAR system design

The method of multi-channel phased array radar squint SAR sy...

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IET International Radar Conference 2015

作者： Cui, Lei Gao, Jing Wang, Zixiao Yao, Di Department of Electronic Engineering Beijing Institute of Technology Beijing China Beijing Key Laboratory of Embedded Real-Time Information Processing Technology China

ISBN: (纸本)9781849199940

Multi-channel phased array radar has the following advantages: detection multiple target, far work distance, antiinterference capability, and sensitive response, etc. The squint SAR (Synthetic Aperture Radar) is an effective means of detection in complex background in all-weather and all-day. Multi-channel phased array radar needs the consistency of amplitude and phase. The design of the system parameter should focus on the problem of spatial variability properties of PRF and resolution design. This paper introduces the composition analysis of multi-channel phased array radar, consistency of amplitude and phase, and the design of radar system parameters. The result of flight experimentation verifies the method of system design.

关键词： Systems analysis

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