Assessment of precise orbit and clock products for Galileo, BeiDou, and QZSS from IGS Multi-GNSS Experiment (MGEX)

作者:Guo, F (Guo, Fei)^{[ 1,2 ]} ; Li, XX (Li, Xingxing)^{[ 1,3 ]} ; Zhang, XH (Zhang, Xiaohong)^{[ 1,2 ]} ; Wang, JL (Wang, Jinling)^{[ 4 ]}

GPS SOLUTIONS

卷: 21

期: 1

页: 279-290

DOI: 10.1007/s10291-016-0523-3

出版年: JAN 2017

摘要

The focus is on the quality assessment of precise orbit and clock products for the emerging Galileo, BeiDou, and QZSS systems. Products provided by Multi-GNSS Experiment (MGEX) over 2 years are used for evaluation. First, the products are assessed by orbit and clock comparisons among individual analysis centers (ACs), which give us an objective impression of their consistency. In addition, the precise orbits are verified by satellite laser ranging (SLR) residuals, which can be regarded as indicators of orbit accuracy. Moreover, precise point positioning (PPP) tests are conducted to further verify the quality of MGEX precise orbits and clocks. Orbit comparisons show agreements of about 0.1-0.25 m for Galileo, 0.1-0.2 m for BeiDou MEOs, 0.2-0.3 m for BeiDou IGSOs, and 0.2-0.4 m for QZSS. The BeiDou GEO orbits, however, have the worst agreements having a few meters differences. Clock comparisons of individual ACs have a consistency of 0.2-0.4 ns for Galileo, 0.2-0.3 ns for BeiDou IGSOs, 0.15-0.2 ns for BeiDou MEOs, 0.5-0.8 ns for BeiDou GEOs, and 0.4-0.8 ns for QZSS in general. The SLR validations demonstrate an accuracy of about 0.1 m for the current Galileo, BeiDou IGSO/MEO orbits, and about 0.2 m for QZSS orbits. However, the SLR residuals of BeiDou GEO orbits show a systematic bias of about -0.5 m together with a standard deviation of 0.3 m. Solutions of PPP with different products mostly agree well with each other, which further confirms the good consistency of orbits and clocks among ACs. After convergence, an accuracy of 1 mm to 1 cm for static PPP and a few centimeters for kinematic PPP is achieved using multi-GNSS observations and MGEX orbit and clock products. However, it should be noted that a few exceptions may exist throughout the evaluations due to the insufficient models, different processing strategies, and ongoing updates applied by individual ACs.

作者关键词:Multi-GNSS Experiment (MGEX); Orbit comparison; Clock comparison; Satellite laser ranging validation; Precise point positioning (PPP)

KeyWords Plus:ATMOSPHERIC WATER-VAPOR; GPS; MODEL

通讯作者地址: Li, XX (通讯作者)

通讯作者地址: Li, XX (通讯作者)

地址:

电子邮件地址:lxlq109121@gmail.com

基金资助机构授权号

SPRINGER HEIDELBERG, TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY

研究方向:Remote Sensing

Web of Science 类别:Remote Sensing

文献类型:Article

语种:English

入藏号: WOS:000392314000024

ISSN: 1080-5370

eISSN: 1521-1886

Impact Factor (影响因子): 2.991