一种用于合成孔径雷达的数字去斜方法

A Digital Dechirp Approach for Synthetic Aperture Radar

该文提出了一种用于合成孔径雷达(SAR)的数字去斜方法,适用于发射信号脉冲宽度能够覆盖整个测绘条带的轻小型SAR系统。利用该方法,可以首先采用低于雷达系统发射信号带宽的采样频率对回波信号进行数字采集,之后在数字域对距离向回波信号去斜,通过频率分析法完成距离向的压缩处理,无混叠地恢复出目标信息。该文给出了新方法的理论分析与数学推导,并给出采样率选取准则,通过仿真验证了该方法的正确性和有效性。

In this study, a digital dechirp approach for Synthetic Aperture Radar （SAR） is discussed. It can be applied to lightweight MiniSar systems with.longer pulse width than swath. With this method, and after data acquisition with lower sampling rate than the bandwidth of the transmitted LFM signal and digital dechirp, pulse compression can be obtained by spectral analysis in the range direction without aliasing. The approach is described in detail and the sampling frequency selection criteria are derived. Theoretical formulations and numerical simulations verify the validity of the proposed approach.