说明：  对于微弱信号检测算法中非相参积累以后近似服 从于高斯分布的噪声，都可以通过双参量估计恒虚警 检测器来实现恒虚警检测
(Coherent integration for weak signal detection algorithm Central Africa approximately obey the Gaussian distribution of the noise by the two-parameter CFAR detector is estimated to achieve a constant false alarm rate (CFAR))