BDS卫星星内多径及其对宽巷FCB解算的影响分析

doi:10.11947/j.AGCS.2017.20160418

测绘学报 ›› 2017, Vol. 46 ›› Issue (8): 961-970.doi: 10.11947/j.AGCS.2017.20160418

BDS卫星星内多径及其对宽巷FCB解算的影响分析

阮仁桂^1,2,3, 贾小林^2,3, 冯来平^1,2,3

1. 信息工程大学地理空间信息学院, 河南郑州 450052;
2. 地理信息工程国家重点实验室, 陕西西安 710054;
3. 西安测绘研究所, 陕西西安 710054

收稿日期:2016-08-18 修回日期:2017-04-24 出版日期:2017-08-20 发布日期:2017-09-01
作者简介:阮仁桂(1983-),男,助理研究员,研究方向为GNSS精密定位和精密定轨。E-mail:rrg2002me@163.com
基金资助:
国家自然科学基金（41574013）；大地测量与地球动力学国家重点实验室开放基金（SKLGED2014-3-4-E）

Analysis on BDS Satellite Internal Multipath and Its Impact on Wide-lane FCB Estimation

RUAN Rengui^1,2,3, JIA Xiaolin^2,3, FENG Laiping^1,2,3

1. Institute of Surveying and Mapping, Information Engineering University, Zhengzhou 450052, China;
2. State Key Laboratory of Geo-information Engineering, Xi'an 710054, China;
3. Xi'an Research Institute of Surveying and Mapping, Xi'an 710054, China

Received:2016-08-18 Revised:2017-04-24 Online:2017-08-20 Published:2017-09-01
Supported by:
The National Natural Science Foundation of China (No. 41574013);The Open Foundation of State Key Laboratory of Geodesy and Earth's Dynamics (No. SKLGED2014-3-4-E)

摘要/Abstract

摘要： 针对BDS卫星的伪距星内多径（SIMP）问题，提出和强调了在进行SIMP建模时应该采用天底角而非高度角作为自变量，这样获得的模型才能用于不同高程的接收机。收集全球分布的iGMAS和MGEX监测站数据，以天底角为自变量构建了北斗IGSO和MEO两类卫星B1、B2和B3频点的SIMP分段线性模型。利用FY3C星载北斗数据对北斗GEO、IGSO和MEO的SIMP作进一步分析。结果表明，当天底角小于7°时，GEO和IGSO卫星的SIMP非常接近，对B2频点尤其明显。这也许预示着可以将地面数据获得的IGSO卫星的SIMP模型用于GEO卫星。同时还发现在天底角小于12°（MEO）和7°（IGSO）时，所得到的SIMP估值与地面数据获得的模型有非常好的一致性。在此基础上，采用MGEX全球监测网数据进行宽巷小数周偏差（FCB）解算试验，结果表明，经过SIMP改正后，各颗卫星的星端宽巷FCB序列的重复性都有显著提高，改进幅度都超过了60%。具体的，IGSO和MEO的星端FCB重复精度小于0.05周；采用IGSO卫星的SIMP模型对GEO卫星进行改正后，C01和C02星的FCB重复精度分别达到0.023和0.068周。

关键词: BDS, 星内多径, 分段线性模型, 天底角, 小数周偏差, 风云三号C星

Abstract: To the issue of the satellite internal multipath (SIMP) of BeiDou satellites, it proposed and emphasized that the SIMP model should be established as a function of the nadir angle with respect to the observed satellite rather than the elevation of the measurement, so that it can be used for receivers at various altitude. BDS data from global distributed stations operated by the International Monitoring and Assessment System (iGMAS) and the Multi-GNSS Experiment (MGEX) of the International GNSS Service (IGS) are collected and a new SIMP model as a piece-wise linear function of the nadir angle is released for the IGSO-and MEO-satellite groups and for B1, B2 and B3 frequency band individually. The SIMP of GEO,IGSO and MEO satellites is further analyzed with B1/B2 dual-frequency data onboard the FengYun-3 C(FY3C) satellite at an altitude of~830 km, and it showed that, for nadir angles smaller than 7°, the SIMP values for GEO is quite close to the IGSO's, especially for B2, which may suggest that the SIMP model for IGSO satellites possibly also works for GEO satellites. It also demonstrated that, when the nadir angle is smaller than 12°for the MEO and 7°for the IGSO, the estimated SIMP model with data from FY3C is considerable consistent with that estimated with data collected at ground stations. Experiments are carried out to investigate the impacts of the SIMP on wide-lane fractional cycle bias (FCB) estimation for BDS satellites. The result indicates that, with the correction of the estimated SIMP, the repeatability of the FCB series is significantly improved by more than 60% for all satellites. Specifically, for the MEO and IGSO satellites, the repeatability is smaller than 0.05 cycle; the repeatability of 0.023 and 0.068 cycles achieved for GEO satellites C01 and C02 respectively with the estimated SIMP model for IGSO satellites.

Key words: BDS, satellite internal multipath, piece-wise linear model, nadir angle, FCB, FengYun-3 C satellite

中图分类号:

P228

阮仁桂, 贾小林, 冯来平. BDS卫星星内多径及其对宽巷FCB解算的影响分析[J]. 测绘学报, 2017, 46(8): 961-970.

RUAN Rengui, JIA Xiaolin, FENG Laiping. Analysis on BDS Satellite Internal Multipath and Its Impact on Wide-lane FCB Estimation[J]. Acta Geodaetica et Cartographica Sinica, 2017, 46(8): 961-970.

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BDS卫星星内多径及其对宽巷FCB解算的影响分析

Analysis on BDS Satellite Internal Multipath and Its Impact on Wide-lane FCB Estimation

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