中文说明：
通过调用计算雷达的信噪比，对比雷达在三咱不同雷达截面积下的信噪比，从而分析不同雷达截面积下信噪比情况是如何的，得出相应结论。
English Description：
Through a call to calculate radar SNR, contrast radar under three different radar cross-section of za signal-to-noise ratio, to analyze different signal-to-noise ratio under the radar cross-section is how, the corresponding conclusions.