摘要
2000中国大地坐标系统(China Geodetic Coordinate System 2000,CGCS2000)的建立和维持主要依赖于GPS技术,不利于保障国家时空信息安全。中国北斗卫星导航系统(BeiDou navigation satellite system,BDS)提供亚太区域服务,可满足中国及周边地区高精度定位导航应用需求,对建立和维持国家大地坐标参考框架具有重要意义。研究利用已建成的北斗基准站网观测数据,实现基于BDS技术、并与国际地球参考框架(International Terrestrial Reference Frame,ITRF)一致的国家大地坐标参考框架,为今后国家级和全球性北斗坐标参考框架(BeiDou Terrestrial Reference Frame,BTRF)的建立和维持提供理论基础和方法支撑。初步计算结果表明,积累2a以上的观测数据,利用单独BDS数据可以获得与GPS精度相当的水平速度场,精度约为2~3mm/a。基于单独BDS数据,测站残差平面和高程的重复性分别可优于0.8cm和1.7cm。利用BDS数据已可监测到测站高程方向的季节性变化。此外,还对单独BDS与GPS数据计算的坐标可能存在的与经纬度相关的系统误差进行了分析。总体来说,目前的北斗系统可满足建立和维持中国cm级大地坐标框架的需求。
The realization and maintenance of the China geodetic coordinate system 2000（CGCS2000）depends on GPS technologies,and therefore is a national security risk.BDS began offering services to customers in the Asia-Pacific region in December 2012.It provides a good opportunity to realize and maintain the national terrestrial reference frame（TRF）using BDS system.We focus on how to use BDS observations of BDS/GPS stations with dual-mode receivers to realize the National TRF,aligned to the international terrestrial reference frame（ITRF）.Results show that the precision of the horizontal velocity derived from BDS data are comparable to those derived from GPS data at about 2-3 mm/a,using more than two years of observation data.The RMS of the station coordinate residuals,with the linear velocity removed,are better than 0.8 cm and 1.7 cm for the horizontals and verticals,respectively.The current precision of BDS data can allow observation of seasonal displacements in the verticals.System errors related to the longitude and latitude are found in the coordinate differences between BDS and GPS data based on PPP mode.Thus,the current BDS system can be used to realize and maintain the national terrestrial reference frame at cm level.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2017年第11期1635-1643,共9页
Geomatics and Information Science of Wuhan University
基金
国家杰出青年科学基金(41325015)
国家自然科学基金(41574027
41774007)~~
关键词
北斗坐标参考框架
速度场
系统误差
ITRF
BeiDou terrestrial reference frame（BTRF）
velocity field
system error
ITRF
