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全球定位系统(GPS)是随着卫星通信和计算机技术的进步而发展起来的,其目的是用于全球范围内的精确定位导航。GPS是由空间段、地面段和用户段三部分组成。空间段共有24颗卫星,分布在离地面高度为2千米以上的6个圆形轨
The Global Positioning System (GPS) was developed with advances in satellite communications and computer technology, and is aimed at pinpoint navigation around the world. GPS is composed of space section, ground section and user section. There are 24 satellites in the space segment, distributed over 6 circular orbits above 2 km above the ground