星载SAR成象数字信号处理

DIGITAL SIGNAL PROCESSING TECHNIQUES FOR SPACE-BORNE SYNTHETIC APERTURE RADAR(SAR)

星载合成孔径雷达(SAR)飞行高度高,速度快、探测距离远、测绘带宽,运行轨道偏离理想圆形,因此获取SAR图象的数字信号处理技术十分复杂。本文从上述特点出发,讨论了星载SAR的目标回波信号数学模型,成象过程中方位处理的机理和方法,以及多视处理。

Space-borne SAR flies at high altitude, moves fast, has large radar detecting range and wide measuring swath, and its traveling orbit deviates from on ideal circle, so it is complex for digital signal processing technique to obtain SAR imagery. According to th2 properti3S mentioned above, the target return wave modol of spacer-borne SAR, azimuth processing principle and method in the imaging, and multi-look processing are discussed in this paper.