GNSS多系统动态精密单点定位性能分析

Performance Analysis of Multi-GNSS Dynamic Precision Point Positioning

文中在GPS精密单点定位(PPP)理论与方法的基础上,给出了多系统组合的精密单点定位技术观测模型,采用GPS、GLONASS、GALILEO、BDS四大卫星导航定位系统的实测数据,研究并分析了四系统组合PPP的定位性能。结果表明,多系统PPP精度较单系统有很大提高,GPS+GLONASS+GALILEO+BDS四系统组合动态PPP在三个方向平均偏差约为0.7cm、0.6cm和1.7cm,收敛时间为15~20min左右,并且多系统PPP在截止高度角增大时,依然有充足的卫星数量,当截止高度角达到30°时,依然能达到cm级定位精度,对机载动态数据进行PPP解算结果显示,四系统组合解算的结果与利用GrafMov的解算结果符合得最好,优于其他双系统和单系统PPP的精度。

Based on the theory and method of GPS precise point positioning,this paper introduced a PPP observation model with multiple system combinations.This paper used observations from GPS,GLONASS,Galileo and BDS to study and analyze the positioning performance of 4-system combined PPP.The result showed that the accuracy of multi-GNSS PPP is much higher than single system PPP,GPS＋GLONASS＋GALILEO＋BDS combination dynamic PPP in the three directions of the average deviation is about 0.7 cm,0.6 cm and1.7 cm,the convergence time is about 15 ～ 20 min.When the cutoff elevation angle increased,there was still a sufficient number of satellites.When the cutoff angle reached 30 degrees,still can reach cm-level positioning accuracy.The result of PPP solution on the airborne dynamic data showed that the result of the four-system combination solves best with the result of GrafMov,and outperforms of two-system and single-system PPP.