机载聚束SAR的信号处理技术

A Signal Processing Technology for Airborne Spotlight Synthetic Aperture Radar

聚束SAR是获得高分辨率的重要工作模式,距离上去调频技术是ISAR和小成像带SAR常用的经济有效的方法。本文讨论了聚束模式下距离上去调频信号的回波信号的模型和特点,以及FSA成像算法的基本概念,并将FSA运用于Ku波段飞行试验数据的成像中,获得了高分辨率图像,其几何分辨率达0.5m×0.5m。

Spotlight synthetic aperture rader (spotlight SAR) is an important model to obtain the highresolution in azimuth orientation. Range-dechirp technology is a useful method for inverse synthetic apertureradar (ISAR) and SAR with small strip width. This paper first discussed the character of spotlight range-dechirp raw data, then a spotlight SAR imaging algorithm-frequency scaling algorithm (FSA) was intro-duced to be applied to the Ku band airborne SAR imaging experiment. Finally.a SAR image with high reso-lution of 0. 5m×0.5m was obtained.