结合视线方向运动补偿的滑动聚束SAR子孔径成像算法

doi:10.7527/S1000-6893.2015.0159

Abstract

Abstract:

Sliding spotlight synthetic aperture radar(SAR) is a rising imaging mode, whose azimuth resolution is higher and imaged area is greater. When processing data, two key problems should be considered. Firstly, system's pulse repetition frequency(PRF) is always insufficient, which makes the azimuth signal folding. Secondly, the effect of motion error enhances because of longer synthetic aperture, consequently the accuracy of motion compensation(MOCO) should be increased. This paper presents a modified high-resolution imaging scheme based on subaperture. Subaperture method is used to overcome the problem that PRF is insufficient. Meanwhile, processing of subaperture data chooses Omega-K algorithm with line-of-sight(LOS) motion compensation to implement high-precision motion compensation, improving focused quality. The presented algorithm can attain 0.1 m azimuth resolution and has the value of practice. Simulations with point targets and processing of real data are used to confirm the validity of the proposed algorithm.

Key words: synthetic aperture radar, sliding spotlight, subaperture, line-of-sight motion compensation, Omega-K algorithm, baseband azimuth scaling

CLC Number:

V243.2
TN958

YANG Mingdong, ZHU Daiyin. An imaging algorithm for sliding spotlight SAR using subaperture with line-of-sight motion compensation[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(3): 984-996.

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An imaging algorithm for sliding spotlight SAR using subaperture with line-of-sight motion compensation

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