弹载双基前视SAR扩展场景成像算法设计

doi:10.3969/j.issn.1001-2400.2016.03.006

Abstract

Abstract:

Due to such problems as high order terms in double square roots and more serious range cell migration than monostatic or bistatic SAR in range history, caused by high velocities and accelerations in both the transmitter and the receiver platforms in a new and special bistatic synthetic aperture radar imaging mode, i.e., missile-borne bistatic forward-looking synthetic aperture radar, an imaging algorithm correcting space variance for the extended scene for is proposed. The range walk is firstly corrected in the time domain to reduce the two dimensional (2D) coupling. And then the space variance of phase terms, in the 2D frequency spectrum of the echo signal with high precision gained by the method of series reversion, is analyzed quantitatively. The imaging is completed through polynomial fitting and variant match filter designing. With simple operation and less computation, our algorithm is convenient for imaging processing and subsequent procedure in the missile-borne platform. Simulation results show our imaging method significantly corrects the space variance, improves the focus quality of fringe targets, and thus extends the imaging scene.

Key words: missile-borne synthetic aperture radar, imaging algorithm, bistatic forward-looking, space variance revision, series reversion

CLC Number:

TN957

MENG Ziqiang;LI Yachao;XING Mengdao;BAO Zheng. Imaging method for the extended scene of missile-borne bistatic forward-looking SAR[J].Journal of Xidian University, 2016, 43(3): 31-37.

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[1]	LIANG Yi, LI Qingqing, SUN Kun, DANG Yanfeng, DING Jinshan. New method for missile positioning based on SAR scene matching [J]. Journal of Xidian University, 2018, 45(6): 1-6.
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[3]	LIU Gaogao;ZHANG Linrang;YI Yusheng;LIU Nan;LIU Xin;WANG Chun. Missile-borne squint SAR algorithm based on a curve locus [J]. J4, 2011, 38(1): 123-130.

Imaging method for the extended scene of missile-borne bistatic forward-looking SAR

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