摘要
在实现BDS/GPS/GLONASS组合精密单点定位的基础上,模拟多种遮挡环境;利用3个MGEX测站的数据进行三系统组合PPP试验;并在可见卫星数、PDOP值、定位精度、收敛时间和定位可用性等方面与GPS单系统PPP进行了比较分析。结果表明：在亚太地区,相比于GPS单系统PPP,三系统组合PPP可见卫星数增加了2~3倍,PDOP值显著减小。动态试验中,在无遮挡环境下,三系统组合PPP相较于GPS PPP收敛时间更短,且收敛后定位精度更高;在遮挡环境下,GPS PPP性能急剧下降,三系统组合PPP较好的保证了定位精度,提高了系统定位可用性。
Based on the realization of BDS / GPS / GLONASS combined PPP（ Precise Point Positioning）, multi-GNSS PPP is tested under various masking environments. Three MGEX stations are used to compare BDS / GPS / GLONASS combined PPP with GPS-only PPP on the aspects of satellite visibility, PDOP value, convergence time, positioning accuracy and availability. The results show that： compared to GPS-only PPP, the combined PPP has 2 to3 times visible satellites and the PDOP value reduces observably; in kinematic PPP without masking environment,both the convergence time and the accuracy of combined PPP are improved; in masking environment, the performance of GPS-only PPP decreases sharply, but the combined PPP still has a preferable positioning accuracy which improves the availability.
出处
《测绘科学技术学报》
CSCD
北大核心
2016年第1期21-26,共6页
Journal of Geomatics Science and Technology
基金
国家自然科学基金项目(41374027)
湖南省教育厅资助科研项目(13C903)
