星载单频GPS实时精密定轨模型研究  

Precise Real-Time Orbit Determination Model Using Space-Borne Single-Frequency GPS Observations

作　　者：郭磊[1] 王甫红[1] GUO Lei;WANG Fuhong(School of Geodesy and Geomatics,Wuhan University,129 Luoyu Road,Wuhan 430079,China)

机构地区：[1]武汉大学测绘学院,武汉市430079

出　　处：《大地测量与地球动力学》2020年第4期371-375,共5页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(91638203)。

摘　　要：采用星载单频GPS伪距和相位观测数据,构建单频伪距相位无电离层组合(GRAPHIC)消除电离层延迟误差的影响,同时建立伪模糊度参数随机模型,吸收广播星历中的轨道和钟差误差。对国内外8颗低轨卫星星载GPS实测数据进行单频实时定轨模拟解算,结果表明,使用GRAPHIC组合作为主要观测值,实时定轨位置精度达到0.44~0.55m,速度精度达到0.37~0.63mm/s,相比于传统的基于双频伪距观测值的实时定轨方式,定轨精度提升40%左右。根据本文星载单频GPS定轨模型和算法,仅使用低成本的单频GPS观测即可以实现低轨卫星高精度实时定轨。To eliminate the influence of the ionosphere we construct the group and phase ionosphere correction(GRAPHIC)with single-frequency GPS pseudo-range and phase observations.At the same time,we add pseudo-ambiguity parameter to the orbit determination filter to absorb the broadcast ephemeris errors.We assess the absorption effect and accuracy of real-time orbit determination for space-borne single-frequency GPS with real GPS measurements of 8 different low earth orbit satellites.The results show that the accuracy of real-time orbit determination improves greatly with GRAPHIC measurements.The position accuracy is 0.44-0.55 m and the velocity is 0.37-0.63 mm/s.The accuracy improvement is about 40%compared to the traditional dual-frequency pseudo-range real-time orbit determination method.We believe that with the real-time orbit determination algorithm mentioned in this paper,high precise orbit determination results can be achieved with low-cost single-frequency GPS receiver.

关 键 词：微小卫星 星载单频GPS GRAPHIC 伪模糊度 实时精密定轨 

分 类 号：P228[天文地球—大地测量学与测量工程]