说明：  GPRMAXSO Computes the excitation function used in GprMax2D/3D simulators for ground probing radar. Amplitude is the amplitude of the source frequency is the frequency of the source in Hz Time_step is the time step in seconds Time_window is the total simulated time in seconds excitation is a vector which contains the excitation function. If you type plot(excitation) Matlab will plot it. You can use the signal processing capabilities of Matlab to get a Spectrum etc.