GPS数据处理策略优化及适用性分析

Optimization and applicability analysis of GPS data processing strategy

为了分析电离层处理模式对高精度GPS数据处理精度的影响,文中结合全球分布的国际GPS服务(International GPS Service,IGS)跟踪站及具体的工程实例,对不同长度基线进行了处理,结果表明:使用高阶电离层模型改正,对成果精度有一定的提高,特别是不同长度基线处理时,应采用不同的处理模式,以便于保证成果的准确性.针对高精度GPS数据处理需要多时段重复观测的问题,本文基于误差理论提出了GPS数据处理过程中合理构建基线处理回数,多回基线组合平差的新方法;设计典型的实验研究了不同星历条件下长基线的处理效果.成果展示:采用长基线处理回数组合平差的方法,对数据处理成果精度的提高具有显著的效果,且在几种精密星历下均表现良好的收敛性;短基线通过增加基线处理回数及组合平差,成果精度及可靠性进一步提高.

Inorder to analyze the effect of ionospheric processing mode on high-precision GPS data processing,this article used the observation data of International GPS Service(IGS)tracking station and project cases,processed different length baselines,the results show that Using higher-order ionospheric model correction can improve the accuracy of the results,especially when dealing with different length baselines,different processing modes should be used to ensure the accuracy of the results.Aiming at the problem that high-precision GPS data processing requires repeated observations in multiple periods,this paper proposed a new method for constructing a reasonable number of baseline processing rounds and multi-pass baseline combined adjustment during GPS data processing based on the error theory.Designed several experiments to study the processing effect of long baselines under different ephemeris products.We concluded that the method of long baseline processing rounds combined adjustment has a significant effect on improving the accuracy of data processing results,and shows favorable convergence under several precise ephemeris.Increasing the number of baseline processing rounds and combined adjustment can improve the accuracy and reliability of the short baseline results.