测绘学报 ›› 2024, Vol. 53 ›› Issue (4): 653-665.doi: 10.11947/j.AGCS.2024.20230044

• 大地测量学与导航 • 上一篇    下一篇

中国地震科学实验场BDS-3定位精度和地壳运动初步分析

贺添1(), 孟国杰1(), 吴伟伟1, 苏小宁2, 赵国强1,3, 魏聪敏1,4, 董志华1,4   

  1. 1.中国地震局地震预测研究所,北京 100036
    2.兰州交通大学测绘与地理信息学院,甘肃 兰州 730070
    3.中南大学地球科学与信息物理学院,湖南 长沙 410083
    4.中国地震局地球物理研究所,北京 100081
  • 收稿日期:2023-02-21 修回日期:2023-07-01 发布日期:2024-05-13
  • 通讯作者: 孟国杰 E-mail:2269566647@qq.com;mgj@ief.ac.cn
  • 作者简介:贺添(1997—),男,硕士生,研究方向为GNSS精密数据处理及现今地壳形变。E-mail:2269566647@qq.com
  • 基金资助:
    国家重点研发计划(2019YFE0108900);国家自然科学基金(42374009);中国地震科学实验场项目(CEAIEF20220403);中国地震局地震预测研究所基本科研业务费专项(CEAIEF20220506)

Preliminary analysis to positioning precision and crustal movement of BDS-3 data recorded by the China seismic experiment site

Tian HE1(), Guojie MENG1(), Weiwei WU1, Xiaoning SU2, Guoqiang ZHAO1,3, Congmin WEI1,4, Zhihua DONG1,4   

  1. 1.Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China
    2.Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, China
    3.School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
    4.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
  • Received:2023-02-21 Revised:2023-07-01 Published:2024-05-13
  • Contact: Guojie MENG E-mail:2269566647@qq.com;mgj@ief.ac.cn
  • About author:HE Tian (1997—), male, postgraduate, majors in precise processing of GNSS data and current crustal deformation. E-mail: 2269566647@qq.com
  • Supported by:
    The National Key Research and Development Program(2019YFE0108900);The National Natural Science Foundation of China(42374009);The Research Program of China Seismic Experimental Site(CEAIEF20220403);The Basic Research Program of IEF, CEA(CEAIEF20220506)

摘要:

我国BDS-3卫星导航系统于2020年7月建成,并为全球用户提供服务,自此开始,中国地震科学实验场(简称“实验场”)的GNSS测站相继接收BDS-3卫星数据,目前已经积累了2年多的观测数据,为BDS-3应用于川滇地区地壳运动监测提供了重要平台和数据保障。为评估实验场BDS-3观测数据的精度及其应用于地壳监测的可行性,本文首先根据各测站所记录的BDS-3的B1I和B3I两个频点的多路径效应和信噪比与卫星高度角之间的关系,对BDS-3的数据质量进行评价。然后,基于高精度数据处理软件GAMIT/GLOBK(10.7版)对各测站同期记录的BDS-3和GPS数据分别进行处理,得到BDS-3和GPS坐标时间序列。基于包括线性项、年周期项和半年周期项等分量的函数模型,利用极大似然法分别对BDS-3和GPS时间序列进行拟合估计,得到各测站的线性速度、年周期和半年周期信号,并对拟合结果对比分析,评定BDS-3和GPS的定位精度。最后,讨论BDS-3定位精度的影响因素和BDS-3水平速度场的区域性特征。研究表明:实验场BDS-3与GPS原始数据质量相当,BDS-3坐标时间序列的均方根残差(RMS)的平均值在N、E、U方向上分别为4.42、4.25和8.34 mm,稍大于GPS的结果。BDS-3与GPS速度场在E方向存在约2.0 mm/a系统性差异。在区域分布特征方面,BDS-3和GPS的速度场、周年期和半年信号没有明显差别。认为目前影响BDS-3定位精度的因素主要为卫星轨道产品不够完善,经验型太阳光压模型和卫星天线相位中心改正模型等欠缺。造成BDS-3和GPS速度场差异的原因主要为两者的定位基准不一致。随着实验场BDS-3观测数据的积累和数据解算模型的改进,BDS-3可望达到GPS的定位精度,并形成独立于GPS的监测系统,为该区地壳运动监测和地震预测提供优质的大地测量产品。

关键词: BDS-3, GNSS, 中国地震科学实验场, 地壳形变

Abstract:

The BDS-3 navigation satellite system of China was completely accomplished in July 2020, then starting to provide services for global users. GNSS stations in the China seismic experiment site (CSES) have been receiving BDS-3 satellite data ever since, and accumulated observational data for more than 2 years, providing an important platform in acquiring observational data for the application of BDS-3 in exploring crustal movement in Sichuan-Yunan area. To assess the current precision of the BDS-3 positioning and its performance in crustal movement monitoring, we first evaluate the quality of BDS-3 observational data according to the relationship of multi-path effect and signal-to-noise ration with elevation angles. Using GAMIT/GLOBK (version 10.7), we have processed the simultaneously recorded BDS-3 and GPS data separately to obtain coordinate time series for each station. Fitting the time series of three coordinate components separately with a functional model which encompasses linear, annual, semi-annual and other terms by the maximum probability estimation method, we obtain velocity, amplitude and phase for E, N and U components of the coordinate time series. Furthermore, we evaluate the precision of BDS-3 and GPS by comparative analysis of the fitting results. Finally we discuss the possible factors which could influence the positioning precision of BDS-3, and regional features of the horizontal velocity field derived from BDS-3 observations. The results show that the quality of raw data for BDS-3 observations is comparable with GPS data. The data fitting for BDS-3 and GPS time series shows that the average value of root mean square (RMS) of the BDS-3 residual time series are 4.42, 4.25 and 8.34 mm for the E, N and U components, respectively, larger than those of GPS data. Systematic difference is identified of about 2 mm/a in E direction between velocity fields of BDS-3 and GPS. The velocity fields, and the annual and semi-annual signals derived from BDS-3 and GPS data do not show obvious differences in regional distribution. We think that currently the factors affecting the positioning precision of BDS-3 are the relatively lower precision of satellite orbit and clock difference products, the shortage of empirical solar pressure and satellite antenna phase center correction for BDS-3 and so on. The difference between the velocity fields of BDS-3 and GPS is due to the inconsistence of their reference frames. We expect that, with the continuous accumulation of BDS-3 observational data and the improvement of the data processing models, the positioning precision of BDS-3 will enhance with time, and the BDS-3 will be used independently from GPS to provide geodetic products of high-precision for monitoring crustal movement at CSES.

Key words: BDS-3, GNSS, China seismic experimental site, crustal deformation

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