说明：  通过北斗导航电文数据，计算BDS卫星坐标，存入矩阵，输出结果包括北斗卫星编号，北斗笛卡尔坐标，钟差，时间
(BDS satellite coordinates are calculated by Beidou navigation message data and stored in matrix. The output results include Beidou satellite number, Beidou Cartesian coordinate, clock difference and time)