PrideLab studied the recovery of precise satellite orbit and clock products using the real-time satellite orbit and clock SSR correction stream broadcast by Wuhan University. In (near) real-time PPP applications, a common problem is that it is difficult for users to obtain real-time precise satellite orbit and clock, and the release delay of final products is up to 13 days, and the accuracy of rapid products and ultra rapid products is too low to meet the requirements of PPP positioning accuracy. Therefore, users usually do not have appropriate satellite orbit and clock products to quickly process GNSS data.
It is a good solution to receive the SSR correction stream of satellite orbit and clock in real time, recover the precise satellite orbit and clock products, and store them in the offline repository. This paper studies and analyzes the integrity and accuracy of the recovered precise satellite orbit and clock products, and then uses the products to carry out GNSS static PPP and simulated real-time kinematic PPP experiments to verify its quality and application performance. At present, real-time precise satellite orbit and clock products including GPS, GLONASS, Galileo and BDS are available to the public with a delay of less than 3 hours. Users can download the corresponding RTS orbit, clock and erp files in the /orbit and /clock directories of the corresponding year under the ftp://igs.gnsswhu.cn/pub/whu/phasebias/.
For more details, please refer to the paper “Analysis of real-time multi-GNSS satellite products of Wuhan University for rapid response of precise positioning”.
Fig. 1 Time series of G/R/E/C kinematic PPP positioning errors using real-time products and final products
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