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Improved chirp scaling algorithm integrated motion compensation for parallel-track bistatic synthetic aperture radar

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Journal of Beijing Institute of Technology 2011年第4期20卷 536-539页

作者：齐春东曾涛李枫 School of Information and Electronics Beijing Institute of Technology

To compensate motion errors of images from the parallel-track bistatic synthetic aperture radar（BiSAR）,an improved chirp scaling algorithm（CSA） is *** velocity vector of the moving aircrafts in the parallel-track BiSAR system can not remain invariant in an aperture,an actual aperture is divided into subapertures so that it is reasonable to assume that the aircrafts move with constant acceleration vector in a *** on this model,an improved CSA is *** new phase factors incorporate three-dimensional acceleration and *** motion compensation procedure is integrated into the CSA without additional operation *** simulation results show that the presented algorithm can efficiently resolve motion compensation for parallel-track BiSAR.

关键词： chirp scaling algorithm parallel-track bistatic synthetic aperture radar motion compensation

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Improved chirp scaling algorithm for parallel-track bistatic SAR

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Journal of Systems Engineering and Electronics 2009年第2期20卷 291-296页

作者： Li Feng Li Shu Zhao Yigong School of Electronics Engineering Xidian Univ. Xi'an 710071 P. R. China Dept. of Information Science and Electronic Engineering Zhejiang Univ. Hangzhou 310058 P. R. China EAAF Equipment Inst. of Land-based Air Defense Beijing 100085 P. R. China

The curvature factor of the parallel-track bistatic SAR is range dependent, even without variation of the effective velocity. Accounting for this new characteristic, a parallel-track chirp scaling algorithm （CSA） is derived, by introducing the method of removal of range walk （RRW） in the time domain. Using the RRW before the CSA, this method can reduce the varying range of the curvature factor, without increasing the computation load obviously. The azimuth dependence of the azimuth-FM rate, resulting from the RRW, is compensated by the nonlinear chirp scaling factor. Therefore, the algorithm is extended into stripmap imaging. The realization of the method is presented and is verified by the simulation results.

关键词： bistatic synthetic aperture radar chirp scaling range walk curvature factor parallel track

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A Raw Signal Simulator for bistatic SAR

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Chinese Journal of Aeronautics 2009年第4期22卷 434-443页

作者： Xia Weijie,Zhou Jianjiang College of Information Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China College of Information Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

This article proposes a new efficient raw signal simulator for the bistatic synthetic aperture radar （SAR） based on 2D fast Fourier transform （FFT） to deal with cases of both ideal trajectory and trajectory deviation. It begins with analyzing the geometric configuration and the range history of the bistatic SAR in side-looking and squint modes of ideal trajectory as well as trajectory deviation. Then a detailed and mathematical study is conducted on the equivalence relation of bistatic-to-monostatic applications （BTMA） in the case of ideal trajectory and trajectory deviation. Also a set of formulas are derived for the equivalence relation between bistatic SAR and monostatic SAR on some reasonable assumptions. Therefore, the application of the simulation method based on the 2D FFT for the monostatic SAR can be extended to the case of bistatic SAR. Finally, the simulation results prove the validity of this method. By comparing the efficiency of the proposed method with that of the time domain method, it is shown that the former is a few orders of magnitude higher.

关键词： bistatic synthetic aperture radar raw signal simulation fast Fourier transform

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The Extended Chirp Scaling Algorithm for bistatic SAR Imaging

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The Extended Chirp Scaling Algorithm for Bistatic SAR Imagin...