说明：  连接一起的下半部分是传统一次调频系数的仿真，参数如算例所示，上半部分是其改进一次调频系数后的仿真，最后由示波器观测波形的不同。
(The lower half of the connection is the simulation of the traditional primary frequency modulation coefficient. The parameters are shown in the example. The first half is the simulation after the improvement of the primary frequency modulation coefficient, and finally the waveform is observed by the oscilloscope.)