中文说明：随机调制信号下的模拟ppm，计算加权加速度,一个很有用的程序，外文资料里面的源代码，有详细的注释，对于初学者具有参考意义。
English Description：
Simulation of random modulation signal ppm, calculated the weighted acceleration, a very useful program, foreign materials inside the source code, detailed comments are useful for beginners.