根据比较精确的数学公式，我们用ＭＡＴＨＣＡＤ（计算机辅助设计数学软件）可以方便地计算出海杂波ＲＣＳ随距离变化的曲线。考虑到海情、地球曲率、海水反射特性及极化方式等因素的影响，对应不同雷达截面积的目标，可计算出低仰角时的接收机输出信噪比与距离的关系曲线。根据雷达的积累信噪比，可用该曲线比较精确地估算出跟踪雷达对超低空目标的最大捕获距离。

According to much more accurate mathematics formula, and considering the whole influence of sea state, the earth curvature, reflection characteristic of sea water and polarization mode, we can easily calculate out the RCS of sea clutter varying with range, the relation curve of receiver outputting S/N to range for target of difference RCS at low elevation, and estimate accurately the max. acquirement range for super low target from the curve by accumulative S/N of the radar in MATHCAD.

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