Authors:
Qinghua Zhang
1
;
Fengjuan Rong
2
and
Zhengsheng Chen
3
Affiliations:
1
Beijing Key Laboratory of Urban Spatial Information Engineering, Beijing, State Key Laboratory of Geo-information Engineering, Xi’an, College of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, Army Engineering University of PLA, Nanjing and Jiangsu, China
;
2
Army Engineering University of PLA, Nanjing and Jiangsu, China
;
3
State Key Laboratory of Geo-information Engineering and Xi’an, China
Keyword(s):
WGS84, NGA, ITRF, transformation
Abstract:
The WGS84 coordinate system of GPS is dominated by the United States. At present, the ephemeris framework of WGS84 is mainly established and maintained by NGA with precise ephemeris. However, the IGS precise ephemeris usually adopted by navigation users is an ephemeris framework of ITRF. This paper mainly evaluates the differences and transformation parameters between WGS84/ITRF. In the example of this article, the WGS84/ITRF transformation parameter sequence is used daily from 2001 to the present. By analysing the seven conversion parameters, it is found that only in a few days there are still wild values. After eliminating field values, the three translation parameters are not more than 10cm, three rotation parameters are no more than 0.1mas, and the scale parameters are not more than 0.1ppb.The characteristics of conversion parameters in WGS84/ITRF can provide important reference for the GNSS users in the precision positioning and orbit determination.