Rapid ambiguity resolution over medium-to-long baselines based on GPS/BDS multi-frequency observables

作者:Gong, XP (Gong, Xiaopeng)^{[ 1 ]} ; Lou, YD (Lou, Yidong)^{[ 1,3 ]} ; Liu, WK (Liu, Wanke)^{[ 2,3 ]} ; Zheng, F (Zheng, Fu)^{[ 1 ]} ; Gu, SF (Gu, Shengfeng)^{[ 1 ]} ;Wang, H (Wang, Hua)^{[ 3,4 ]}

ADVANCES IN SPACE RESEARCH

卷: 59

期: 3

页: 794-803

子辑: 1

DOI: 10.1016/j.asr.2016.07.011

出版年: FEB 1 2017

会议名称

会议: 7th China Satellite Navigation Conference (CSNC)

会议地点: Changsha, PEOPLES R CHINA

会议日期: MAY 18-20, 2016

摘要

Medium-long baseline RTK positioning generally needs a long initial time to find an accurate position due to non-negligible atmospheric delay residual. In order to shorten the initial or re-convergence time, a rapid phase ambiguity resolution method is employed based on GPS/BDS multi-frequency observables in this paper. This method is realized by two steps. First, double-differenced un-combined observables (i.e., L1/L2 and B1/B2/B3 observables) are used to obtain a float solution with atmospheric delay estimated as random walk parameter by using Kalman filter. This model enables an easy and consistent implementation for different systems and different frequency observables and can readily be extended to use more satellite navigation systems (e.g., Galileo, QZSS). Additional prior constraints for atmospheric information can be quickly added as well, because atmospheric delay is parameterized. Second, in order to fix ambiguity rapidly and reliably, ambiguities are divided into three types (extra-wide-lane (EWL), wide-lane (WL) and narrow-lane (NL)) according to their wavelengths and are to be fixed sequentially by using the LAMBDA method. Several baselines ranging from 61 km to 232 km collected by Trimble and Panda receivers are used to validate the method. The results illustrate that it only takes approximately 1, 2 and 6 epochs (30 s intervals) to fix EWL, WL and NL ambiguities, respectively. More epochs' observables are needed to fix WL and NL ambiguity around local time 14:00 than other time mainly due to more active ionosphere activity. As for the re-convergence time, the simulated results show that 90% of epochs can be fixed within 2 epochs by using prior atmospheric delay information obtained from previously 5 min. Finally, as for positioning accuracy, meter, decimeter and centimeter level positioning results are obtained according to different ambiguity resolution performances, i.e., EWL, WL and NL fixed solutions. (C) 2016 COSPAR. Published by Elsevier Ltd. All rights reserved.

作者关键词:GPS/BDS; Medium-long baseline; Rapid ambiguity resolution; Multi-frequency observables

KeyWords Plus:GPS; IONOSPHERE

通讯作者地址: Liu, WK (通讯作者)

地址:

电子邮件地址:wkliu@sgg.whu.edu.cn

基金资助机构授权号

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ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND

研究方向:Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences

Web of Science 类别:Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences

文献类型:Article; Proceedings Paper

语种:English

入藏号: WOS:000392683400006

ISSN: 0273-1177

eISSN: 1879-1948

Impact Factor (影响因子): 1.409