中文说明：包括轨道机动仿真、初轨计算,复化三点Gauss-lengend公式求pi，利用matlab写成的窄带噪声发生，实现了图像的加水印，去噪，加噪声等功能，基于互功率谱的时延估计，对于初学matlab的同学会有帮助。
English Description：
Including orbit maneuver simulation, initial orbit determination, the complex of three Gauss-lengend formula for PI, written using MATLAB narrowband noise, to achieve the image plus watermark, denoising, coupled with the function of the noise, cross power spectrum time delay estimation based on, for beginners matlab students will have to help.