发射角和到达角二维角度自动配对，其中主要解决一个angle函数的问题。-Emission angle and the angle of arrival automatically paired two-dimensional angle, which is mainly to solve a problem of angle function.

二维数字信号的插值问题模板，非常易于理解，适合初学者-Two dimensional digital signal interpolation problem template, very easy to understand, suitable for beginners