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Considerations of designing P-band space-borned bistatic radar systems

Considerations of designing P-band space-borned bistatic rad...

引用

IET International Radar Conference 2015

作者： Li, Yuanyuan Guo, Xin Liu, Feifeng Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing Institute of Technology China Army Aviation Institute China

ISBN: (纸本)9781849199940

P-band space-based bistatic radar can globally detect and track moving targets with very strong penetration ability and has become an important research field in the radar community recently. This paper discusses the problems of the designing the P-band bistatic space-based radar such as the characteristics analysis of the target RCS, the antenna size analysis, the effect of ionosphere and the influence of sea clutter characteristics. The numerical results were used to verify the theoretical analysis.

关键词： Ionosphere

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A Four-Bank Memory Design of Optimized Semi-Parallel Polar Decoder 9

A Four-Bank Memory Design of Optimized Semi-Parallel Polar D...

引用

2017 9th IEEE International Conference on Communication Software and Networks (ICCSN 2017)

作者： Shiwen Xing Yun-Nan Chang Liang Chen Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Department of Computer Science and Engineering Sun Yat-sen University

ISBN: (纸本)9781509038237;9781509038220

Polar code, which is capable of achieving channel capacity, is known as a promising forward error correction（FEC） code in coding theory. In this paper, a four-bank memory architecture is proposed for polar decoder to store the initial and the intermediate processing data. Based on the proposed load-balance data allocation scheme, each memory bank is able to be equipped with only two access ports, while providing enough data bandwidth demand. Besides, the proposed semi-parallel successive cancellation（SC） polar decoder is optimized by employing the efficient p node and the merged computation of f and g nodes to reduce the decoding latency, which can at most get 62.5% speed improvement with enough processing elements（PEs）. In addition, the proposed four-bank memory design can reduce the overall size of memory especially with higher level of parallelism.

关键词： ploar code successive cancellation decoding fourbank memory design optimized semi-parallel design

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SSRI-NET: AN ITERATIVE NETWORK FOR SAR SUPER-RESOLTION IMAGING

SSRI-NET: AN ITERATIVE NETWORK FOR SAR SUPER-RESOLTION IMAGI...

引用

2022 International Conference on Radar Systems, RADAR 2022

作者： Wang, Ziwen Wei, Yangkai Ding, Zegang School of Information and Electronics Beijing Institute of Technology Beijing China Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing China

ISBN: (纸本)9781839537776

SAR imaging is a widely used technique to solve the remote sensing problem. However, the image resolution of traditional imaging methods is limited by signal bandwidth. In order to solve this problem, a new iterative network is proposed to obtain SAR super-resolution images, i.e., SAR Super-Resolution Imaging Network (SSRI-Net). The proposed SSRI-Net is designed to implement SAR super-resolution imaging. In SSRI-Net, the SAR echo is transformed to the SAR reconstruction image, while an additional decoder part does the opposite operation. The SSRI-Net is composed of the unfolded Alternating Direction Method of Multipliers (ADMM), and the decoder part is formulated into a linear mapping to achieve self-supervised imaging. Numerical simulation and real-data experiment in microwave anechoic chamber demonstrate the robustness and effectiveness of the proposed method. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Image resolution

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Spaceborne Large-Squint Terrain-Matching Synthetic Aperture Radar: Concept and technology 6

Spaceborne Large-Squint Terrain-Matching Synthetic Aperture ...

引用

6th Asia-Pacific Conference on Synthetic Aperture Radar, APSAR 2019

作者： Wang, Yan Li, Zhe DIng, Zegang Zeng, Tao Radar Research Lab Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China

ISBN: (纸本)9781728129129

This paper discusses a new spaceborne large-squint terrain-matching synthetic aperture radar (LSTM-SAR) to effectively image the terrains that do not spread along satellite orbit. Different from the traditional spaceborne SAR, the swath of the LSTM-SAR spreads along the target terrain, instead of the satellite orbit, to perform terrain-matched imaging with both high resolution and short data acquisition period. Aiming at giving a sketch of how the LSTM-SAR works, the paper focuses on discussing the following three main aspects: the data acquisition geometry, azimuth sampling manner and raw data focusing algorithm. Specifically, an optimum squint geometry is firstly suggested for two dimensional swath optimization;then two non-uniform azimuth sampling methods are discussed to avoid data loss induced by transmission blockage;lastly, a wide nonlinear chirp scaling based algorithm is discussed to focus the spatially variant spaceborne LSTM-SAR echo. The presented approach is validated via the computer simulations. © 2019 IEEE.

关键词： Synthetic aperture radar

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PRELIMINARY RESULTS OF UAV ULTRAWIDEBAND SAR TOMOGRAPHY BASED ON MULTI-PASS DATA

PRELIMINARY RESULTS OF UAV ULTRAWIDEBAND SAR TOMOGRAPHY BASE...

引用

2022 International Conference on Radar Systems, RADAR 2022

作者： Sun, Yu Li, Linghao Ding, Zegang Wang, Yan Ma, Xinnong Sun, Xinshuai School of Information and Electronics Beijing Institute of Technology Beijing China Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing China

ISBN: (纸本)9781839537776

Unmanned-aerial-vehicle(UAV) synthetic aperture radar(SAR) tomography can overcome the overlapping and geometric distortion inherent in two-dimensional(2-D) SAR and provide three-dimensional(3-D) radar images of observation scenes flexibly and cheaply. In 2021, a novel P-band ultra-wide-band(UWB) SAR system was designed and installed on a multi-rotor UAV, and multi-angle multi-pass UAV SAR tomography data was collected using this UWB SAR system. This paper demonstrates a UAV-borne SAR tomography experiment, including system introduction, experiment design, data processing, and imaging results. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Tomography

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DATA-DRIVEN SAR IMAGE RECONSTRUCTION METHOD USING ADMM WITH DEEP PLUG-AND-PLAY PRIORS

DATA-DRIVEN SAR IMAGE RECONSTRUCTION METHOD USING ADMM WITH ...

引用

IET International Radar Conference 2023, IRC 2023

作者： Wang, Ziwen Wei, Yangkai Ding, Zegang Shan, Xueting Wu, Yifan School of Information and Electronics Beijing Institute of Technology Beijing China Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing China

ISBN: (纸本)9781839539954

Synthetic Aperture Radar (SAR) image reconstruction fundamentally constitutes an ill-posed reconstruction conundrum, with the overarching objective of faithfully restoring the'authentic' SAR scenes via radar echo measurements and a forward model. The conventional FFT-based approach, in conjunction with matched filtering, tends to yield undesirable sidelobes and speckle artifacts. Conversely, the reconstruction challenge can be cast as a minimization problem, seeking to enhance outcomes by merging data-term and prior-related terms. This composite problem is amenable to resolution via proximal methods. In this paper, a novel data-driven methodology is employed, leveraging the plug-and-play (PNP) technique to train a neural network for acquiring target image priors. In comparison to traditional manually crafted priors and PNP priors, the proposed PNP deep priors exhibit the capacity to achieve superior reconstruction results. Experimental assessments involving synthetic and real SAR scenes underscore the robustness and efficacy of the proposed approach. © The Institution of Engineering & technology 2023.

关键词： Matched filters

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A high resolution medium penetrating imaging radar system

A high resolution medium penetrating imaging radar system

引用

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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DEMONSTRATION OF P BAND UAV BISTATIC SAR EXPERIMENT AND IMAGING processing

DEMONSTRATION OF P BAND UAV BISTATIC SAR EXPERIMENT AND IMAG...

引用

IET International Radar Conference 2023, IRC 2023

作者： Ma, Xinnong Li, Linghao Ding, Zegang School of Information and Electronics Beijing Institute of Technology Beijing China Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing China

ISBN: (纸本)9781839539954

UAV Bistatic SAR (UAV BiSAR) distributes the transmitting and receiving system on different UAVs, which has the advantages of anti-reconnaissance, powerful crypticity and anti-interference capability. However, due to problems such as channel delay, radio frequency interference(RFI), and synchronization error, it is difficult to perform 2D imaging on the UAV BiSAR real data. Therefore, the results of UAV BiSAR real data are rare in the existing literature. The P-band UAV BiSAR real data based on two-way convection performed in this paper can well solve the above problems. Next, we will demonstrate the P-band UAV BiSAR two-dimensional imaging experiment. Finally, some imaging results are given to verify the P-band UAV BiSAR mode and processing method. © The Institution of Engineering & technology 2023.

关键词： Radio interference

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Research on amplitude-phase error for LFMCW radar

Research on amplitude-phase error for LFMCW radar

引用

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...

引用

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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