说明：  室内定位时差定位算法。包括 chan算法，fang算法。功能是实现室内定位。在3到7个接收基站的基础上，获得较高精度的定位
(Indoor location TDOA location algorithm. Including Chan algorithm and Fang algorithm. Function is to achieve indoor positioning. On the basis of 3 to 7 receiving base stations, high precision positioning can be achieved.)