说明：  使用仿真软件 Matlab 产生一定载频和宽度的脉冲串，并叠加高斯白噪声， 信噪比为 1。编写程序进行相参积累并对比不同积累方式下信噪比的大小。
(The simulation software MATLAB is used to generate a certain carrier frequency and width of the pulse train, and superimpose white Gaussian noise, SNR is 1. The program is non coherent accumulation and compares the signal to noise ratio under different accumulation modes.)