利用多模卫星导航系统加快PPP的收敛速度

Accelerating the Convergence Speed of Precise Point Positioning by Using Multi-GNSS

精密单点定位(Precise Point Positioning,PPP)不需要基准站的支持,具有广阔的应用前景.但是PPP获得高精度定位需要一个收敛过程.为了加快PPP的收敛,讨论利用多模卫星导航系统加快PPP的收敛.实验表明多模卫星导航系统使用了更多的观测量,收敛速度明显加快,三维误差收敛到10 cm、15 cm和20 cm需要时间减少的平均百分比分别为42%、78%和74%.同时也表明在山区等卫星高度截止角较高的困难地区,在单一系统无法实现定位的情况下,多模卫星导航系统也可以明显加快PPP的收敛,获得较好的定位结果.

The Precise Point Positioning （PPP） does not need the support of base station, and it has broad application prospects. However, the convergence time of PPP is long. In order to accelerate the convergence speed of PPP, the PPP model using multi-GNSS （Global Navigation Satellite System） is discussed. The experiments show that the convergence speed becomes faster by using the multi-GNSS, the mean percentage of time reduction for converging to different precisions （10 cm, 15 cm, and 20 cm） is 42%, 78%, and 74%, respectively; meanwhile, in the severe regions, such as in the mountainous regions, the number of observed satellites becomes fewer, and the PPP sometimes cannot achieve positioning using single system. But PPP using multi-GNSS can achieve positioning and accelerate the convergence.