说明：  《gps基本原理及其matlab仿真》(西安电子科技大学)里面的程序源代码，都是自己亲自敲上的。对入门很有用的。这是获取导航信息的。
(The basic principle of GPS and the matlab simulation (xi an university of electronic science and technology) in the program source code, is knock on yourself. The introduction is very useful. This is for navigation information. )