自己需要给出坐标，GPS测距。主要是实现了基于maltab测距GPS测距原理(you should give coordinates, GPS ranging)

包含GPS导航原理与 应用 Kalman滤波理论及其哎导航系统中应用 秦永远的惯性导航，以及严恭敏的捷联惯导与组合导航原理讲义(Including GPS navigation principle and application Kalman filtering theory and its application in navigation system Qin Yong's inertial navigation, and Yan Gongmin's strapdown inerti