用于均匀光栅、相移光栅、取样光栅、啁啾光栅等反射特性和时延的模拟。-the simulation of sampled grating

用以模拟超声波指向性的三维图像，另外显示旁瓣，栅瓣，主瓣，以及能量分布-Order to simulate the three-dimensional image of ultrasonic directivity, and show the sidelobe, grating disc, main lobe, and the energy distribution