这是国外关于卫星导航方面一书的源代码，相信对初学者会有很大的帮助，里面包含位置计算、星历计算、模糊度计算等功能。-This is the foreign aspects of satellite navigation on the book s source code, I believe there will be a great help for beginners, which contains the location of computing, ephemeris calculatio