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模糊度固定的北斗卫星多系统融合精密轨道确定
引用本文:房亚男,辛景民,曾光,王家松,李杰.模糊度固定的北斗卫星多系统融合精密轨道确定[J].测绘学报,2018,47(3):341-347.
作者姓名:房亚男  辛景民  曾光  王家松  李杰
作者单位:1. 西安交通大学, 陕西 西安 710049;2. 宇航动力学国家重点实验室, 陕西 西安 710043;3. 西安卫星测控中心, 陕西 西安 710043
基金项目:国家自然科学基金,The National Natural Science Foundation of China
摘    要:利用全球分布的IGS和MGEX站多模观测数据,研究了北斗卫星多系统融合双差动力学精密定轨方法,提出了适应北斗系统的双差模糊度固定策略。结合实测数据,对比了单系统与多系统融合、模糊度固定解与浮点解的定轨效果。结果表明:相比单系统定轨,多系统融合定轨能有效改进IGSO和MEO卫星轨道精度,但对于GEO卫星,多系统融合定轨并无优势;利用改进的模糊度固定策略对IGSO和MEO卫星双差模糊度进行固定,有效提高了长基线模糊度固定率,整体固定成功率由40%提高到60%以上;模糊度固定对定轨精度改进作用明显,IGSO和MEO卫星三维定轨精度分别提高了48%和36%,达到0.048 m和0.066 m。

关 键 词:北斗卫星导航系统  精密定轨  多系统融合  模糊度固定  精度分析  
收稿时间:2017-07-07
修稿时间:2017-12-20

BeiDou Satellites Multi-GNSS Precise Orbit Determination with Ambiguity Fixed
FANG Yanan,XIN Jingmin,ZENG Guang,WANG Jiasong,LI Jie.BeiDou Satellites Multi-GNSS Precise Orbit Determination with Ambiguity Fixed[J].Acta Geodaetica et Cartographica Sinica,2018,47(3):341-347.
Authors:FANG Yanan  XIN Jingmin  ZENG Guang  WANG Jiasong  LI Jie
Institution:1. Xi'an Jiaotong University, Xi'an 710049, China;2. State Key Laboratory of Astronautic Dynamics, Xi'an 710043, China;3. Xi'an Satellite Control Center, Xi'an 710043, China
Abstract:Using the global distributed IGS and Multi-GNSS experiment(MGEX)data,a method of multi-GNSS integrated double-difference precise orbit determination(POD)of BeiDou navigation satellites is studied.Then a specific double-difference ambiguity fixing strategy for BDS is proposed.The orbit determination precision of using single system and multi-GNSS,as well as ambiguity-fixed solution and ambiguity-free solution,are compared based on real observation data.The results show that,compared with single system processing,the multi-GNSS integrated method can effectively improve the orbit precision of IGSO and MEO,but except for GEO.The result of IGSO and MEO ambiguity fixing by the proposed strategy is well.The ambiguity fixing success rate has been improved significantly,especially for long baselines.The ambiguity fixed success rateimproves form 40% to 60% or more on the whole.Ambiguity fixing shows a positive contribution to orbit accuracy of IGSO and MEO from the overlapping RMS with that of the free solution for comparison.The 3D-RMS of IGSO could reach 0.048 m,and that of MEO could reach 0.066 m.
Keywords:
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