摘要
首先介绍了非差非组合精密单点定位(precise point positioning,PPP)算法,分析了它与传统PPP的差异;处理了300个IGS跟踪站连续7d的数据,分析了接收机伪距硬件延迟偏差(difference code bias,DCB)和先验电离层精度对非差非组合PPP收敛速度的影响。统计结果表明,对于非差非组合PPP,利用IGS提供的全球电离层延迟模型GIM,静态定位精度N/E方向均收敛到10cm以内,估计接收机DCB的PPP平均收敛速度为13.12min,比不估计接收机DCB的PPP快5.36min,与传统的LC PPP相当。在获得高精度电离层先验数据的条件下,估计接收机DCB的非差非组合PPP平面精度收敛10cm的速度约为8.67min,比传统PPP收敛速度平均快约3.26min。
We first introduce GNSS precise point positioning （PPP） based on un-differential uncombined raw pseudo-ranges and carrier phase observations （RAW-OBS-PPP）. Then the difference between the traditional PPP based on ionosphere-free dual-frequency combination （LC-PPP） and RAW-OBS-PPP is discussed and evaluated by analyzing mass data of 300 IGS GPS sites during day of year 034-040, 2012. The effects of receiver＇s DCB and the precision of priori-ionospheric delay on the convergence of RAW-OBS-PPP are focused and discussed in details. For RAW-OBS-PPP, while global ionosphere mapping （GIM） provided by International GNSS Service （IGS） are used as priori-information for ionosphere delays, and the receiver＇s DCB is estimated, then the mean time is about 13.12 min to take convergence into 10 cm in both north and east components. If no receiver DCB estimated, it needs about 18.48 rain. LC PPP and RAW-OBS-PPP have almost the same performance under the condi- tion that GIM is used for RAW-OBS-PPP. If ionosphere delays with higher precision are used as priori-information, RAW-OBS-PPP needs about 8.67 min（mean value） in horizontal components, which is much faster than traditional LC PPP.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2013年第12期1396-1399,I0001,I0002,共6页
Geomatics and Information Science of Wuhan University
基金
国家973计划资助项目(2009CB72400205)
国家863计划资助项目(2012AA12A206)
国家自然科学基金资助项目(41004010)
