GPS卫星P1C1码间偏差对动态PPP影响分析

Impact Analysis of P1C1 Differential Code Biases of GPS Satellites on the Kinematic Precise Point Positioning

由于接收机类型不同,双频精密单点定位模型之间存在系统的P1C1码间偏差。研究表明,P1C1码间偏差对静态PPP影响很小,但是对动态PPP影响仍需进一步评估。利用自主研制的软件,详细分析P1C1偏差对模拟的动态PPP的影响。结果表明,经过P1C1码间偏差改正后,C1P2类型接收机模拟的动态PPP效果得到改善,但仍然比P1P2类型接收机的定位结果差,表明实验所采用的IGS发布的P1C1偏差产品精度仍有待进一步提高。

For the PPP model of dual frequency,systematic P1C1 code biases of GPS satellites exist because of the use of different types of receivers.Currently,it is well known that DCB has little influence on static PPP,but there is still much work to do regarding the influence of DCB on kinematic PPP.This paper undertakes a thorough evaluation of DCB＇s influence on simulated kinematic PPP,processing one whole month＇s observation data.The results show that the accuracy of simulated kinematic PPP of the NONCC receiver reporting C1 and P2types improves after DCB correction,but is still lower than that of the NONCC receiver reporting P1 and P2types.The results indicate that there is a need to improve the accuracy of DCB published by the IGS analysis center.