距离向多孔径接收宽测绘带SAR系统信噪比分析

The SNR Study of the Wide Swath SAR Basing on Elevation Multi-receiver

基于距离向多孔径接收的宽测绘带合成孔径雷达(SAR)方法在理论和仿真上已经被证明是一种精度较高,应用前景较好的宽测绘带SAR方法。在以往的研究中对该方法的信噪比分析只是通过矩阵的条件数来定性地分析系统的信噪比,这样就得不出信噪比的定量解析表达式,也无法给出系统信噪比的最优设计准则。本文通过Vandermonde逆矩阵的解析表达式推出了系统信噪比的解析表达式,证明了系统信噪比的极限值,并且给出了系统信噪比的最优设计准则。最后给出了几个符合信噪比最优准则的系统方案,并计算了系统信噪比改善曲线,验证了最优准则的正确性。

The wide swath synthetic aperture radar （SAR） method basing on elevation multi-receiver is proved to be a high precise and feasible wide swath SAR method by theory and simulation. The SNR of this method has been analyzed by the matrix condition, and the analysis leads to only a qualitative conclusion in previous study. In this paper, the explicit formula is deduced for the SNR of this method, then the limit of the SNR is given and the optimal SNR design rule is presented. Finally, some system schemes according to the optimal SNR rule is given at last and those SNR curve is calculated to validate the rule.