该函数用于产生固定时间宽度的正弦脉冲。使用该函数式必须预先设定如下参数：脉冲的时间宽度Tp，正弦波的周期个数Nc，脉冲幅度A，脉冲的采样点数smp。-This function is used to generate a sinusoidal pulse of fixed time width. Using the function formula must be pre-set to the following parameters: the number Nc of the time of