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

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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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Design of a large point FFT processor with configurable transform length

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

引用

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...

引用

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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FM-CW signal phase error analysis and compensation

FM-CW signal phase error analysis and compensation

引用

IET International Radar Conference 2015

作者： Deng, Y. Guo, X. Wang, R. Hu, C. Zeng, T. Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing Institute of Technology Beijing China Army Aviation Institute Beijing China

ISBN: (纸本)9781785610387

Frequency Modulated Continuous Wave (FM-CW) waveform has been widely used in radar range measuring, speed measuring and imaging. However, the performance of matched filtering for range compression is usually degraded by the nonideal factors in the real radar system, such as the frequency modulation ratio error and the unstable sampling clock. In this paper, an iterative method is proposed to compensate these phase errors induced by the nonideal factors based on the entropy minimum. The principle of the proposed iteration is to construct a series of local quadratic curves to gradually approach the minimum. Finally, both simulated and experimental datasets are used to validate the feasibility and effectiveness of the proposed method.

关键词： Iterative methods

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Measurement estimation in forward scatter radar with a planar array

Measurement estimation in forward scatter radar with a plana...

引用

IET International Radar Conference 2015

作者： Liu, C. Wang, L. Wang, M. Hu, C. Department of Information and Electronics Beijing Institute of Technology Beijing China Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China

ISBN: (纸本)9781785610387

A technique is presented for estimating the primary measurements of forward scatter radar with a planar array. The space-time processing based on three-dimensional discrete Fourier transform is employed and the computation is reduced without loss of accuracy. By analyzing the Cramer-Rao lower bound, the performance of the given approach is shown. Meanwhile, the effect of the target's complex scatter coefficient to the Doppler measurement is noticed. Numerical simulation presents an estimation of primary measurements with good accuracy.

关键词： Direction of arrival

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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...

引用

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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Estimation method of coherent efficiency of distributed coherent aperture radar based on cross-correlation

Estimation method of coherent efficiency of distributed cohe...

引用

IET International Radar Conference 2015

作者： Yin, Pilei Yin, Wen Li, Hui Liang, Zhennan Liu, Zhengcheng Liu, Quanhua Radar Research Laboratory Beijing Institute of Technology Beijing100081 China Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing100081 China

ISBN: (纸本)9781849199940

Estimation error of coherent parameter will decrease the coherent performance of distributed coherent aperture radar (DCAR). The evaluation of coherent performance in real time will determine the subsequent work mode of the DCAR. Therefore, a real-time monitoring method of coherent performance should be researched to establish a closed-loop workflow system. In this paper, an estimation method of coherent efficiency of DCAR based on cross correlation is proposed. Firstly, the transmitting coherent efficiency and the receiving coherent efficiency are defined via the cross correlation, which are the composition of full coherent efficiency. In the following, the received echo is modified by unit radar according to coherent parameters, and then the coherent performance is estimated by cross correlating the transmit signal and the modified echo signal. In the end, the simulation is carried out and verifies the effectiveness of the proposed method.

关键词： Efficiency

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Improved SPECAN algorithm based on Doppler rate equalization

Improved SPECAN algorithm based on Doppler rate equalization

引用

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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An efficient FFT-mapping method based on cache optimization

An efficient FFT-mapping method based on cache optimization

引用

IET International Radar Conference 2015

作者： Zhu, Liang Liu, Tengfei Gao, Lining Wang, Jingyang Radar Research Laboratory School of Information and Electronics Beijing Institute of Technology Beijing China Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China

ISBN: (纸本)9781849199940

Fast Fourier Transform (FFT) is an important technology in real-time signal processing system, which means the efficiency of FFT algorithm mapping to hardware system has very important significance. At first, we aim at the FFT execution process on processor. And then analyze the memory access process based on cache mechanism, and get that the cache hit directly affects FFT execution time. Hence, an efficient mapping method is come up with, which splits long FFT into multiple segments to make sure every segment is shorter than the cache capacity. Accordingly, the cache hit rate will be improved, correspondingly, the execution efficiency will be better finally. In the end, the new method is experimented on the A DI's TS201 digital s ignal proces s or, and the res u lt s hows that the execution time of FFT is improved greatly.

关键词： Fast Fourier transforms

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High range resolution processing based on multi-band Beidou-2 direct signals

High range resolution processing based on multi-band Beidou-...

引用

IET International Radar Conference 2015

作者： Zeng, Tao Tian, Weiming Wang, Jingyang Zhang, Tian Radar Research Laboratory School of Information and Electronics Beijing Institute of Technology Beijing China Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing Institute of Technology Beijing China

ISBN: (纸本)9781849199940

Synthetic aperture radar (SAR) systems have been successful in applications of monitoring stationary terrain. Recently, bistatic SAR systems using GNSS satellites as illu - minates attract intensive attentions in the research field of SAR. Due to the abundant frequency resources of GNSS systems, high resolution synthetic technology in range dimension is of great significance to make full use all of these resources. This paper presents a high resolution synthetic technology in range dimension, which can be used to process general signals obtained by radar systems. In this paper, GNSS signal is considered particularly and that method is modified to deal with GNSS signals. Then an experiment is carried out by Beidou-2 satellites system. The experiment result shows that this method is quite useful to Beidou-2 direct signals and the feasibility and effectiveness of this algorithm is verified.

关键词： Synthetic aperture radar

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