Abstract
Abstract. In order to probe into the characteristics of positioning deviation between Beidou Navigation Satellite System (Beidou) and global positioning system (GPS), and investigate possible contribution of Beidou data to refinement of global coordinate system, refined calculation is made on observation data of 240 national reference stations that are distributed uniformly across China on the whole in this study. These stations support satellite signals of four global navigation satellite systems, including Beidou, GPS, GLONASS and Galileo, and a 5-year time span from 2016 to 2020 is adopted. In this study, PPP is calculated based on GPS data and Beidou single system data in no-difference resolution network mode, and accurate coordinates of national reference stations in two processing modes are obtained. Analysis of difference between the calculations based on Beidou data and on GPS data shows that the consistency between Beidou and GPS positioning results reaches about 5 mm in the east and in the north, and about 1.3 cm in the height direction.
Highlights
In recent years, global navigation satellite system (GNSS) has developed rapidly
Since precise point positioning solution in this study is conducted on the basis of observation data of a continuous 5year period from 2016 to 2020 from Chinese national GNSS reference stations and the time span is large, linear variation is unavoidable for the calculated station coordinates
Based on global positioning system (GPS) data and BDS data of the national GNSS reference stations uniformly distributed across China, precise point positioning is calculated, and the difference in station coordinates calculated from GPS data and BDS data is analyzed, which provides a reference for data processing for construction and maintenance of Beidou coordinate frame
Summary
Global navigation satellite system (GNSS) has developed rapidly. Beidou satellite navigation system has adopted a "three-step" approach to construction, from active to passive and from regional to global. On July 31, 2020, Beidou-3 system will be officially opened, marking the successful completion of the three-step development strategy of Beidou and a new era of global service. Its main purposes are to define coordinate system of the Beidou Satellite Navigation System, research the theories and methods of implementing and maintaining coordinate system in peacetime and wartime, provide solutions to refinement of geocentric coordinates of ground monitoring station of China's global satellite navigation system, determine the conversion relation between China's independent coordinate system and geodetic coordinate systems such as international terrestrial reference frame (ITRF) (Altamimi Z et al.,2011,2016), WGS84, PZ-90, GTRF and so much more and estimate conversion accuracy, to address the needs of navigation, positioning and orbit determination of the Beidou Navigation Satellite System
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