子带时延补偿法降低去斜脉冲压缩的副瓣电平
Reducing sidelobe level of stretching pulse compression by subband delay compensation
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摘要: 线性调频去斜体制中，去斜后频率与目标距离成正比，不同目标距离的回波时延不一样，由于各个单频脉冲在时间上不对齐，对观察区两侧的回波作统一时域加权后，加权的不对称，导致高的副瓣，该文通过子带滤波器组在每个子带内实现时延补偿，多通道综合后加权可大大降低副瓣电平。Abstract: In stretching processing system of linear FM, the frequency is in proportion to range and the delay of returns are different in different ranges. The single frequency pulses occupy different time intervals indicating the variation in time delay as a function of range after stretching processing. This will lead to high sidelobe when proceeding with a uniform weight in the whole time width. This paper describes a method of delay compensation with subband filter group. Sidelobe level of weighted signal will be greatly reduced after the synthesis of multiple channels.
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W.G. Carrara, R. S. Goodman, R. M. Ma.jewski, Spotlight Synthetic Aperture Radar Signal Processing Algorithms, Boston, London, Aretch House, 1995, 26-30.[2]J.M. Headrick, J. F. Thomaso, Applications of high-frequency radar, Radio Science, 1998, 33(4),1045-1054.[3]水鹏朗,保铮,基于频带分割的超宽带雷达脉冲压缩方法,电子学报,1999,27(6),51-54.[4]M. Skolnik, G. Andrews, J. P. Hansen, Ultrawideband microwave-radar conceptual design.[J]. IEEE Aerospace Electronic Systems Magazine.1995,10(10):25- -
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