采用最小二乘原理，进行了伪距单点定位计算；包含广播星历计算计算卫星坐标，地固系与WGS84坐标系间转换，最小二乘平差计算，定位几何因子GDOP等-Using least square method, we carried out pseudorange single point positioning calculation　contains satellite ephemeris calculation calculate coordinates secured between the system and the WGS84 coordinate system conversion, least squares adjustment calculation, location and other geometric factor GDOP