根据广播星历计算卫星位置 利用空间前方交会的算法实现卫星定位-Satellite positioning based on broadcast ephemeris satellite position calculation algorithms utilize space intersection

可以记录坐过的站数，以及智能扣掉钱，还有防止逃票功能-Number of stations that can be recorded sat, and smart money deducted, as well as to prevent fare evasion function