计算目标和海洋回波的功率谱密度,计算十字叉丝的在不同距离的衍射图像,一个计算声子晶体结构的一维传递矩阵法。- Calculating a target and ocean echo power spectral density, Calculation crosshairs diffraction image at different distances, A one-dimensional transfer matrix method to calculate the phonon cryst