基于混合编程的实时精密单点定位方法

Real-time Precise Point Positioning Based on Mixed Programming

在已有后处理精密单点定位Fortran程序的基础上,基于C/C++和Fortran的混合编程技术,实现了实时静态精密单点定位,其中高精度卫星轨道及钟差参数由卫星广播星历和SSR改正信息数据流实时估算,卫星观测数据流由GNSS接收机实时提供。通过实时精密单点定位程序验证了混合编程技术的可行性,对于相关的研究工作和精密单点定位的实时性应用具有参考价值。GPS单系统实时静态精密单点定位试验结果表明:在6 h观测时段,1 s采样间隔的情况下,实时静态精密单点定位的收敛时间约为30~100 min;利用实时定位解算结果与测站精确坐标求差计算的RMS,收敛后可实现水平方向优于5 cm,垂直方向优于10 cm。

On the basis of the FORTRAN program that has the existing post processing for the precise point positioning data,the real-time static precise point positioning is realized by means of a C/C++-Fortran mixed programming,in which the parameters of high-precision satellite orbit and clock difference are real-time estimated through the satellite broadcast ephemeris and the SSR correction information data stream,and the satellite observation data flows are provided by GNSS receiver in real time.The feasibility of the mixed programming technology can be validated by the real-time precise point positioning program,which is of good reference value for the relevant researches and the real-time application of the real-time static precise point positioning.The results from the real-time static precise point positioning test of GPS single system indicate that the convergence time of the real-time static precise point positioning is about 30~100 min under the cases of 6-hour observation session and 1 second sampling interval.The RMS calculated according to the real time positioning results and the exact coordinate difference of the stations are better than 5cm horizontally and 10cm vertically after the convergence.