单参考星下全星座单差FCB估计与应用

doi:10.11947/j.AGCS.2018.20170519

摘要/Abstract

摘要： 单差FCB应用于模糊度固定解PPP中，能够提高定位精度并加快收敛速度。但由于地球遮挡，单颗卫星无法与全部卫星形成共视，因此单颗参考星下无法获得所有卫星的单差FCB。若播发多个参考星下的单差FCB作为补充，则会增加数据传输负担。为兼顾可用性与数据量，本文依据差分传递原理将不同参考星的单差FCB转换至同一参考星下，采用基于GPHASE初值的抗差估计对转换后的FCB进行合并，以获得单参考星下全星座单差FCB。选取IGS监测站网15 d的数据生成改进后的FCB产品，并进行固定解PPP验证。试验结果表明，仅播发单参考星改进后的单差FCB即可满足应用需求，改进FCB与现有的FCB产品相差小于0.04周，稳定性与可用性均优于传统的单差FCB。利用单参考星的合并FCB进行固定解PPP：静态解算的水平精度优于1 cm，垂直精度优于2 cm；动态解算时可在15 min左右实现5 cm以内的三维定位精度。

关键词: 精密单点定位, 星间单差, 小数周偏差, 参考星转换, 抗差估计

Abstract: The single-difference FCB is applied to the ambiguity resolution of precise point position,which can improve the positioning accuracy and speed up the convergence.However,due to the earth block,one satellite cannot form common views with other satellites,which means one reference satellite cannot get all the single-difference FCB.If single-difference FCB of multiple reference satellites is broadcast as a supplement,the burden of data transmission will be increased.Considering the availability and data volume,this paper proposes an improved FCB generation method.Based on the principle of differential transfer,it converts the single-difference FCB's of different reference satellites into a common one.Then it uses the robust estimation based on the GPHASE initial value to merge the converted FCB.In this paper,15 days data from IGS monitoring network are selected to generate the improved FCB and the fixed solution PPP is implemented.The experimental results show that the improved single-difference FCB of one reference satellite can meet the application requirements.Stability and availability of the improved FCB is better than that of traditional single-difference FCB,and the difference compared with existing FCB product is less than 0.04 cycle.Using the improved FCB,users can achieve a fixed solution PPP with a horizontal accuracy better than 1 cm and a vertical accuracy better than 2 cm in static mode.The kinematic PPP can achieve the 3D positioning accuracy within 5 cm in about 15 minutes.

Key words: precise point positioning, inter-satellite single difference, fractional cycle bias, reference satellite conversion, robust estimation

中图分类号:

P228

焦博, 郝金明, 刘伟平, 张辉, 温旭峰, 师一帅. 单参考星下全星座单差FCB估计与应用[J]. 测绘学报, 2018, 47(10): 1326-1336.

JIAO Bo, HAO Jinming, LIU Weiping, ZHANG Hui, WEN Xufeng, SHI Yishuai. Estimation and Application of Single Difference FCB for Full Constellation Using One Reference Satellite[J]. Acta Geodaetica et Cartographica Sinica, 2018, 47(10): 1326-1336.

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