基于PPP技术的伪距多路径效应分析

从3个方面研究了河北省CORS系统各参考站的伪距多路径效应:1)比较了不同截止高度角条件下（5°、15°和25°）的伪距多路径效应，分析了多路径效应与高度角之间的关系；2)以若干个受多路径影响较为严重的参考站为例，基于其多路径效应的天空分布图（skyplot）分析了不同方位、不同高度角卫星观测值的多路径大小，同时对相应测站环境进行考察，验证了多路径效应的环境影响因素；3)利用PPP技术分别处理了受多路径影响最强和最弱的两参考站：永清和安新站同一天的观测数据，考察了多路径效应对PPP位置估值的收敛时间和收敛稳定性的影响。

ANALYSIS OF PSEUDORANGE MULTIPATH EFFECTS BASED ON PRECISE POINT POSITIONING TECHNOLOGY

A preliminary study was carried out to analyze the pseudorange multipath effect from reference stations of Continuous Operation Reference System (CORS) in Hebei province from the following four aspects. 1)A comparison was made among the pseudoramge multioath effects under different cut off elevation angles(5°, 15° and 25°) and then the relations between the multipath effects and elevation angles are figured out. 2)All the reference stations are equipped with the same type of combinations of receiver and antenna, the discrepancy of the multipath can mainly due to the distinct environment of each receivers, taking several typical multipath affected severely stations as examples, based on the basis of the skyplot of multipath, the effects of azimuth and elevation dependent effect of multipath were exactly examined, at meantime, a filed inspection of environment surrounding the stations was held, and the abovementioned factors further was verified.3)The dataset respectively from the strongest and weakest multipath affected reference stations at the same day was processed, and the influences of multipath on the convergence time and repeatability of PPP solutions further were examined.