基于北斗星基增强辅助的 PPP 定位收敛方法研究

Research on PPP Positioning Convergence Method Based on Beidou SBAS

通过移动通信数据传输,实时获取IGS网站精密星历和精密钟差,通过接收机天线获得北斗星基增强差分数据;然后采用双频无电离层非差观测值组合来消除电离层的影响,并采用扩展卡尔曼滤波(EKF)进行模糊度和坐标平滑处理;再用均值聚类(FCM)算法将定位结果进行分类处理,得到各个聚类的中心点,将各个聚类中心点相加求平均,得到PPP收敛的起算点,然后采用Hatch算法对PPP定位结果进行快速收敛,得到cm的定位结果。该方法相比于以往PPP定位的做法,收敛时间缩短了90%以上,节省了在标定过程中的时间,满足了PPP快速高精度定位的工程需求。

Through mobile communication data transmission,the precise Ephemeris and clock offset of the IGS website are obtained in real time,and the SBAS differential enhanced data is obtained through the receiver antenna;then The dual-frequency ionospheric non-differential observation value combination is used to eliminate the influence of the ionosphere,and use the extended Kalman filter(EKF)for ambiguity and coordinate smoothing;then use the mean clustering(FCM)algorithm to classify the positioning results,get the center point of each cluster,and add the center points of each cluster to find average on,the starting point of PPP convergence is obtained,and then the Hatch algorithm is used to quickly converge the PPF positioning result and the positioning result of cm is obtained.Compared with the previous PPP positioning method,this method shortens the convergence time by more than 90%,saves the time in the calibration process,and meets the engineering requirements of PPP rapid and high-precision positioning.