单频GPS实时精密单点定位的一种算法

An algorithm for real-time PPP by using single frequency GPS observations

近年来,PPP技术已经变得广为流行并且受到众人关注。如何实时获得较高精度的轨道、钟差产品并且有效地改正电离层误差已成为单频GPS进行实时PPP定位解算的关键问题。本文提出了一种基于SBAS提供的实时轨道、钟差、电离层改正产品的单频GPS实时PPP定位算法,利用brst和brux两个测站的实测数据进行了基于SBAS的单频GPS实时PPP数据解算,并且分别与基于广播星历的PPP和基于IGS精密产品的PPP定位结果进行了对比分析。结果显示,基于SBAS的实时PPP可实现平面方向精度2.5dm以内,高程方向精度4.5dm以内;定位解算结果差于基于IGS精密产品的PPP,但远优于基于广播星历的PPP。

In recent years, PPP technology has become popular and been paid close attention. How to obtain high-precision orbit and clock products in real-time and correct ionosphere delay effectively have become the key issue of real-time PPP with single frequency GPS observations. In this paper, we presented an algorithm for real-time PPP with single frequency GPS observations based on orbit, clock and ionosphere delay products provided by SBAS. We tested this PPP algorithm by using measured data from brst and. brux station and compared the results with that of other two PPP methods by broadcast ephemeris and IGS precise ephemeris respectively. The results show that： the proposed PPP method can achieve an accuracy of less than 2.5dm in the horizontal direction and less than 4.5dm in the vertical direction. The results are lower than that calculated by IGS precise ephemeris, but it is better than that calculated by broadcast ephemeris.