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IET International Radar Conference 2018, IRC 2018

作者： Wang, Jiale Xie, Yizhuang Yang, Chen Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing100081 China

In this study, a single channel pipelined variable-length fast Fourier transformation (FFT) processor design is presented. With the development of science and technology, digital signal processing has been widely used in many fields. The most basic algorithm of digital signal processing theory, FFT, is widely used in radar signal processing, remote sensing, image processing, communications and other fields. A high real-time and high-throughput FFT processor design method based on the field-programmable gate array (FPGA) platforms is proposed to meet the needs of the synthetic aperture radar imaging digital signal processing. The authors conducted the ISE synthesis based on the Xilinx FPGA platform using xc6vlx760ff1760-1 as the target chip and the ModelSim simulation, combined with Matlab, to verify the correctness of this design. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： MATLAB

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Analysis of micro-motion feature in ISAR imaging via phase-derived velocity measurement technique

Analysis of micro-motion feature in ISAR imaging via phase-d...

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2017 IEEE Radar Conference, RadarConf 2017

作者： Guo, Liyong Fan, Huayu Liu, Quanhua Hu, Cheng Yang, Xiaopeng Beijing Key Laboratory of Embedded Real-time Information Processing Technology Radar Research Lab Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781467388238

A novel ISAR (inverse synthetic aperture radar) motion compensation approach in conjunction with the phase-derived velocity measurement (PDVM) technique to extract micro-motion feature is presented in this paper. In order to obtain high quality ISAR image, the accurate velocity information provided by PDVM is utilized for target motion compensation. By analyzing proper amount of adjacent Doppler cells around the prominent scatterer in the ISAR image, the impact of other scatterers is effectively reduced for micro-motion extraction. Experiments based on radar measured data are performed to show the effectiveness of the proposed method. © 2017 IEEE.

关键词： Inverse synthetic aperture radar

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A Satellite Data-Driven Coherent Parameters Estimation Method via Hierarchical HGRFT for Distributed Coherent Aperture Radar

IEEE Transactions on Radar Systems

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IEEE Transactions on Radar Systems 2024年 2卷 791-804页

作者： Li, Pucheng Ding, Zegang Li, Linghao Lv, Linhan Li, Zhe Zhu, Rui Wang, Guanxing Beijing Institute of Technology Radar Research Laboratory School of Information and Electronics Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing100081 China Beijing Institute of Technology Chongqing Innovation Center Chongqing401331 China

The distributed coherent aperture radar (DCAR) utilizes full coherent processing (FCP). Compared to single radar unit observations, N radar units can achieve an N3 times increase in signal-to-noise ratio (SNR), providing an advantage in observing distant targets. However, its stringent requirements for time and phase of multiple radar units make coherent parameters (CPs) estimation the crucial aspect of FCP. This article introduces a satellite data-driven CPs estimation method via hierarchical and hybrid generalized Radon-Fourier transform (HHGRFT). First, the FCP procedure is outlined, and the signal model with CPs is established. Second, the principles for selecting satellites and observation time in the experimental setup are induced, along with an analysis of the SNR variations during processing. Furthermore, through a hierarchical processing approach using the generalized Radon-Fourier transform (GRFT), interpulse coherence (IPC) processing, interunit-radar coherence (IURC) processing, and inter-subaperture coherent or noncoherent processing are sequentially conducted. The utilization of generalized sharpness (GS) and gradient descent method facilitated CPs estimation, subsequently enhancing the SNR post-coherence processing. Finally, the proposed method has been validated through simulation and successfully applied to a real DCAR system. © 2023 IEEE.

关键词： Signal to noise ratio

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Dynamic partial reconfiguration scheme for fault-tolerant FFT processor based on FPGA

Dynamic partial reconfiguration scheme for fault-tolerant FF...

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IET International Radar Conference 2018, IRC 2018

作者： Wei, Xin Xie, Yi Z. Xie, Yu Chen, He Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing100081 China

The fast Fourier transform FFT processor is an important part of the space real-time signal processing system based on field programmable gate array (FPGA). Since occupying a large amount of logical resources and storage resources, FFT processor is more vulnerable to high-energy particles in space, resulting in single event upset (SEU). This paper presents a novel FPGA scrubbing framework base on dynamic partial reconfiguration technique for a FFT processor to mitigate SEU. The proposed scheme is compared with the blind scrubbing, the reconfiguration time is reduced by 78%. Then, the resource utilisation is 61.5% less than triple modular redundancy scheme. This paper also presents a DPR controller for FFT processor, which is evaluated in terms of hardware resources and reconfiguration time. A comparison to the Xilinx PRC IP shows that multipath delay feedback FFT controller saves 38.6% resources. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： Fast Fourier transforms

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Optimization and verification of OpenVPX-based 10Gbps interconnection 17

Optimization and verification of OpenVPX-based 10Gbps interc...

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17th IEEE International Conference on Communication technology, ICCT 2017

作者： Ben, Rongrong Li, Xingming Hu, Shanqing Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China Tsinghua University Beijing China

ISBN: (纸本)9781509039432

As serial date rates migrate to 10Gbps and beyond, the list of signal integrity (SI) concerns and pitfalls grows. This paper focuses the design of SI of 10G serial link on OpenVPX system, and the research of the corresponding design and optimization methods based on passive design of 10Gbps high speed serial link. Combined pre-emphasis and equalization, the design enhances the quality of full link, reduces the bit error rate, and ensures accurate transmission of 10 Gbps serial signal, with margin left for system operation. With simulation and testing, the methods are verified to be accurate and feasible in this paper. © 2017 IEEE.

关键词： Bit error rate

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A tracking filter algorithm for migratory birds based on group situation constraints 2

A tracking filter algorithm for migratory birds based on gro...

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

作者： Li, Biao Wang, Rui Cai, Jiong Beijing Key Laboratory of Embedded Real-Time Information Processing Technology The Radar Research Lab School of Information and Electronics Beijing Institute of Technology Beijing China

ISBN: (纸本)9798331515669

Aerial animal migration is closely related to human life, and radar is one of the most effective means of observing it. However, scanning radar has a low data rate, a short integration time, and lacks prior knowledge of target speed, while migratory animals exhibit high mobility. These factors make traditional tracking filter algorithms ineffective at predicting their movement. To address this issue, this paper proposes a tracking filter algorithm based on group dynamics constraints, leveraging the characteristic behavior of migratory animals flying in groups. First, the dynamic state of the group is calculated using the group as the research unit. Then, tracking filtering is performed under the constraint of group dynamics. Simulation and field data have verified the effectiveness of the proposed algorithm. © 2024 IEEE.

关键词： Invertebrates

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High-Squint SAR Imaging for Noncooperative Moving Ship Target Based on High Velocity Motion Platform

High-Squint SAR Imaging for Noncooperative Moving Ship Targe...

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2018 China International SAR Symposium, CISS 2018

作者： Zhou, Zhichao Ding, Zegang Zhang, Tianyi Wang, Yan Radar Research Lab School of Information and Electronics Beijing Institute of Technology Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing China

ISBN: (纸本)9781538671931

For high velocity motion platform, it usually takes a shorter azimuth accumulation time to achieve high-squint synthetic aperture radar (SAR) imaging for noncooperative moving ship target with meter-level resolutions. In this case, three-dimensional relative motion of the ship target can be neglected approximately, mainly the translational motion should be considered. However, the magnitude and direction of the target's translational velocity are unknown. To solve the above problem, a two-step imaging method is proposed in this paper. Firstly, the entire scene is coarsely imaged by using the parameters provided by inertial navigation system. The position of the ship target can be judged by two-dimensional order statistics constant false alarm rate (OS-CFAR) detection and ship target pixel clustering. By constructing the band-pass filter in azimuth frequency domain, the data of the target can be obtained effectively, and to a certain extent, sea clutter and noise are suppressed. Then the motion parameters are estimated. Finally, the target is secondarily imaged with the estimated parameters to achieve precise focus. The results of simulation verify the correctness of the analysis and the validity of the proposed method. © 2018 IEEE.

关键词： Parameter estimation

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3-dimensional target localization accuracy analysis based on radar network with aerial and ground-based nodes 18

3-dimensional target localization accuracy analysis based on...

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18th International Radar Symposium, IRS 2017

作者： Taoyu, Lu Feifeng, Liu Lun, Tian Tao, Zeng Teng, Long School of Information and Electronics Beijing Institute of Technology 100081 China Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing100081 China

ISBN: (纸本)9783736993433

Radar network has important application in many fields, such as small target detection etc, especially for the case with wide baseline. Until now, the research to the 3-dimensional (3D) target localization accuracy using radar network is still a research focus in the radar community. In this paper, further research to the radar network with aerial and ground-based nodes is carried out, and the analytical expression of 3D target localization accuracy is derived using the Cramer-Rao lower bound (CRLB). Based on the analytical formulae, impacts of the system topology on the target localization accuracy are investigated. Finally, numerical simulations verify the theoretical analysis of the results.. © 2017 DGON.

关键词： Antennas

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Improved SPECAN algorithm based on Doppler rate equalization

Improved SPECAN algorithm based on Doppler rate equalization

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IET International Radar Conference 2015

作者： Li, Y. Ding, Z. Long, T. Key Laboratory of Embedded Real-Time Information Processing Technology Radar Research Lab. School of Information and Electronics Beijing Institute of Technology Beijing China

ISBN: (纸本)9781785610387

The spectral analysis (SPECAN) algorithm is efficient and always used for synthetic aperture radar (SAR) data processing. But the azimuth dependence of Doppler rate is neglected in SPECAN algorithm, which results in the defocusing of targets away from the scene center. In order to solve this problem, an improved SPECAN algorithm is proposed. Considering the fact that the region of support in the azimuth frequency domain is different for targets in the same range gate, the algorithm equalizes the Doppler rate by nonlinear chirp scaling (NCS) in the azimuth frequency domain. Moreover, a modified map drift (MD) autofocus method is given to estimate the Doppler rate and its dependence. Finally, the effectiveness of the proposed algorithm is verified by real SAR data.

关键词： Spectrum analysis

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A real-time processing system for airborne forward-squint SAR based on DSP

A real-time processing system for airborne forward-squint SA...

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IET International Radar Conference 2015

作者： Zhang, Ningyu Yao, Di Li, Congxin Jing, Kai School of Information and Electronics Beijing Institute of Technology Beijing China Beijing Key Laboratory of Embedded Real-Time Information Processing Technology China Key Laboratory of Electronic and Information Technology in Satellite Navigation China

ISBN: (纸本)9781849199940

Aiming at the characteristics of the airborne forwardsquint SAR imaging, a high-performance SAR real-time processing system is established in this paper. Firstly, in order to realize range cell migration correction (RCMC) accurately and range-azimuth decoupling in forwardsquint SAR imaging, a high-precision SAR imaging algorithm is used in this system, namely nolinear chirp scaling(NCS) algorithm. Secondly, the motion of airborne platform is unstable, so the weighted phase gradient autofocus (WPGA) algorithm is used for motion compensation. Finally, a real-time signal processor is designed which is based on the TMS320C6678 multi-core DSPs issued by TI. The processor satisfied the demands of SAR real-time imaging because of its powerful processing performance and high-speed data transmission ability.

关键词： Synthetic aperture radar

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