Imaging Method for SAR with Low Height and Large Squint Angle Based on Optimized Golomb Sequence and ω-k Algorithm

doi:10.3969/j.issn.1000-1093.2015.01.027

Abstract

Abstract: Higher requirement of pulse repetition frequency will be faced when synthetic aperture radar (SAR) is at a very low height. Doppler centroid will deviate from zero when the squint angle is too large,resulting in defocusing the final image. For imaging of low-height and squint-looking SAR, a pulse repetition frequency is designed properly in order to get a high resolution image and avoid the range and azimuth ambiguities and the interference of the transmitted pulses, and the problem of overlaying the azimuth spectrais solved. Golomb sequence is optimized with cyclic algorithm, and a good autocorrelation is used to get high range resolution. After STOLT interpolation mapping, the raw data is properly processed using ω-k algorithm to get agood imaging result. Simulation results show that the algorithm can solve the problem of low height and large squint SARimaging.

Key words: radar engineering, synthetic aperture radar, low height, large squint angle, optimized Golomb sequence, ω-k algorithm

CLC Number:

TN794

OU Jian-ping, LI Wei, WU Hao-tian, ZHANG Jun, YAN Jia-bing. Imaging Method for SAR with Low Height and Large Squint Angle Based on Optimized Golomb Sequence and ω-k Algorithm[J]. Acta Armamentarii, 2015, 36(1): 187-192.

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