基尔霍夫衍射等光学代码，便于初学者使用，后续以后会逐步更新-Kirchhoff diffraction and other optical code, easy for beginners to use, after the follow-up will be gradually updated

Space target recognition algorithm using PM, Calculate the maximum eigenvalue judgment matrix of AHP, Calculation crosshairs diffraction image at different distances.

Calculation crosshairs diffraction image at different distances, Least-squares algorithm to fit a three-dimensional plane, Including the MUSIC algorithm, ESPRIT algorithm ROOT-MUSIC algorithm.

超声波传感器是将超声波信号转换成其他能量信号（通常是电信号）的传感器。超声波是振动频率高于20KHz的机械波。它具有频率高、波长短、绕射现象小，特别是方向性好、能够成为射线而定向传播等特点。超声波对液体、固体的穿透本领很大，尤其是在阳光不透明的固体中。超声波碰到杂质或分界面会产生显著反射形成反射成回波，碰到活动物体能产生多普勒效应。超声波传感器广泛应用在工业、国防、生物医学等方面。(Ultrasonic sensor is a transducer that converts ultrasoni