一种单频GPS反演误差改正方法研究

Inversion Error Correction Method for Single Frequency GPS

为了将单频GPS直接应用于土地调查(亚米级精度)等业务领域,用码/载波相位扩散技术减少电离层误差和反演卫星轨道误差方法来改善单频GPS的定位精度。本文详细讨论了影响GPS定位精度的电离层延迟和卫星轨道误差的特性,基于码/载波相位扩散技术,提出利用已知点的位置信息和观测值来反演卫星轨道误差的方法,从而提高GPS后续历元的定位精度。实验结果表明,该算法能明显提高单频GPS的定位精度,降低GPS调查系统成本,有效提高系统的灵活性。

In order to apply single frequency GPS to the land survey directly, which requires the survey accuracy of sub-meter, the code/carrier phase divergent technique was used to reduce the ionosphere error and inversionerror of satellite orbit; thus, the positioning accuracy of single frequency GPS was improved. This paper discusses the characteristics of ionosphere delay and satellite orbit error that influence GPS positioning accuracy in detail. Based on code/carrier phase divergent technique, an inversion method for calculating satellite orbit error is proposed using the known point position information and GPS observation values, thus the positioning accuracy of the follow-up epoch is improved. Experiment results show that the proposed method can improve the positioning accuracy of single frequency GPS obviously, reduce the cost of GPS survey system and improve the system flexibility effectively.