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检索条件"机构=Beijing Key Laboratory of Embedded Real-Time Information Processing Technology"

共 577 条记录，以下是71-80 订阅

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Signal modeling and experimental verification in GNSS forward scatter radar 17

Signal modeling and experimental verification in GNSS forwar...

引用

17th International Radar Symposium, IRS 2016

作者： Changjiang, Liu Cheng, Hu Tao, Zeng Li, Wang Teng, Long Beijing Key Laboratory of Embedded Real-time Information Processing Technology Department of Information and Electronics Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781509025183

This paper focuses on the signal modeling and character analysis in the passive radar system using global navigation satellite system (GNSS) satellites as illuminators of opportunity. The signal model derived from the GNSS tracking loop shows that it contains information of both the scatter coefficient and the signal Doppler. An experiment using metal board as target was carried out and the results verified the correctness of the given model. © 2016 IEEE.

关键词： Global positioning system

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Joint slow/fast-time pulse diversity method for countering range gate pull off jamming

Joint slow/fast-time pulse diversity method for countering r...

引用

IET International Radar Conference 2015

作者： Li, Wei Liu, Wei Guo, Liyong Yang, Xiaopeng Beijing Key Laboratory of Embedded Real-Time Information Processing Technology School of Information and Electronics Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781849199940

The range gate pull off (RGPO) jamming is considered as common electronic countermeasures (ECM) technique used to deceive radar tracking system. Under the stationary assumption, traditional slow-time pulse diversity approach needs several pulse repetition intervals (PRIs). However in the presence of RGPO, jamming signals would change fast over PRIs, making stationary hypothesis invalid. Therefore in order to solve this problem, a jamming cancelation approach based on the theory of pulse diversity is proposed in this paper to suppress deception RGPO jamming. In the proposed method, different from the conventional slow-time method, the proposed joint slow/fast time method implements a transmission pulse block in half quantity of PRI, which is designed based on the orthogonal block structure. Then after a simple one-step matched-filtering operation, jamming signal under RGPO can be suppressed efficiently. Since the cancellation process can be completed within one PRI, the stationary hypothesis is no longer needed. Based on the numeral simulations, it is verified that the proposed method is effective for countering RGPO jamming in rapidly changing condition.

关键词： Digital radio

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An Adaptive Phase Noise Filtering Approach for Multi-Frequency Interferometric SAR

An Adaptive Phase Noise Filtering Approach for Multi-Frequen...

引用

2021 CIE International Conference on Radar, Radar 2021

作者： Wang, Zhen Ding, Zegang Wang, Yan Ma, Xinnong Li, Linghao Zeng, Tao Beijing Institute of Technology School of Information and Electronics Beijing China Beijing Key Laboratory of Embedded Real-time Information Processing Technology China

ISBN: (纸本)9781665498142

Multi-frequency (MF) interferometric SAR (InSAR) provides an effective way for the surveying of steep terrains. Phase noise filtering is a key step in MF-InSAR processing which determines the quality of the interferograms and affects the accuracy of inversed elevation. Different from the traditional filtering method of single frequency (SF) InSAR, an adaptive filtering approach for MF-InSAR based on MF phase fusion is proposed in this paper. The main contributions of this method is summarized into two aspects. First, the local fringe frequency estimation (LFFE) is extended from SF to MF case. Second, the non-linear model is introduced in the adaptive phase filtering in the local window based on MF-LFFE to adapt to complex terrains. The computer simulation and the real dual-frequency airborne experiment validate the proposed approach. © 2021 IEEE.

关键词： interferometric SAR local fringe frequency estimation multi-frequency phase noise filtering

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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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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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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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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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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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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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