Realization and analysis of real-time precise point positioning based on SSR broadcast ephemeris corrections
Realization and analysis of real-time precise point positioning based on SSR broadcast ephemeris corrections
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发表时间：
2014
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通讯作者：
Liu Zhi-qian
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作者：
Liu Zhi-qian
分析了基于状态空间表示(SSR)改正的实时精密卫星轨道和时钟产品对广播星历的捕获方法，并对生成的实时卫星轨道和时钟产品进行了评估。基于带广播星历改正的实时精密单点定位(RTPPP)模型，首先通过IGS分析中心发布的实时状态空间表示改正流实现实时静态和动态单点定位。实验结果表明，卫星轨道实时解算结果与IGS最终解算结果的误差均方根可达4 cm~7 cm，卫星钟差RMS可达0.3 ns左右；静态RTPPP的精度在水平分量可达2 cm，上行分量可达4 cm；静态RTPPP的24小时日解算精度可在水平分量和垂直分量上优于2 cm；动态RTPPP的精度可达到厘米级，收敛时间可达到亚分米级可以与不固定歧义的后处理PPP获得的结果几乎相同。
The acquisition approach of real-time precise satellite orbit and clock products based on State Space Representation(SSR)corrections to broadcast ephemeris was analyzed in the paper.The generated real-time satellite orbit and clock products were further evaluated.Based on the Real-time Precise Point Positioning(RTPPP)model with broadcast ephemeris corrections,real-time static and kinematic PPP were realized using real-time SSR corrections through NTRI Pstreams disseminated by IGS analysis centers first,and then the accuracies of real-time static and kinematic PPP were also evaluated.Experimental results showed that the RMS of differences between real-time products and IGS final products could be about 4cm~7cm for satellite orbits and better than 0.3ns for satellite clocks.The accuracy of static RTPPP could reach 2cm level in the horizontal component and 4cm level in the up component when the observation session length is more than 6hours.The accuracy of 24-hour daily solution of static RTPPP could be better than 2cm in the horizontal and vertical components.The accuracy of kinematic RTPPP could reach centimeter level.Its convergence time to sub-decimeter could be almost the same as that taken by post-processing PPP with ambiguity unfixed.