星载SAR的信号模型与性能分析

阐述星载合成孔径雷达（ＳＡＲ）信号的数学模型，涉及点目标和扩展目标的回波响应函数的一维和二维表示，以及目标场的重构问题。进一步分析了回波信号的多普勒特性，给出了严格的和近似的表示式。对星载ＳＡＲ系统的性能，主要是对分辨率和覆盖特性进行了定量分析，给出了具有速度比值修正的计算公式，对模糊性问题也有所涉及。

SIGNAL MODELING AND PERFORMANCE ANALYSIS FOR SATELLITE BORNE SAR

A mathematical model of a satellite borne sysnthetic aperture radar (SAR) signals is explained, in which the response functions of SAR for a point target and an extended target can be represented in a two dimensional format, and the target field can be reconstructed by a sequential correlating approach. The phase history of the SAR echo and its Doppler frequency and Doppler frequency rate are also derived exactly and approximately. The SAR system performance, in terms of the resolution and coverage capabiltiy, is also discussed. The formula with the velocity ratio factor has been given. The ambiguity in a satellite borne SAR system is also involved briefly.