Abstract
Traditional coseismic displacement retrieval generally uses real-time kinematic (RTK) and precise point positioning (PPP) services. However, both RTK and real-time PPP need a network link to transmit the corrected data. Although the network link may be interrupted when an earthquake happens, the PPP-B2b service broadcasted by geostationary orbit (GEO) satellites will not be affected. Its service range mainly covers China and the surrounding areas. In this research, the PPP method with PPP-B2b service based on constrained coordinates is proposed and overcomes the limitation of the network link and long convergence time. First, the accuracy of orbits and clock offsets for the PPP-B2b service is evaluated and compared with real-time service (RTS). Then, the simulated experiments are carried out using the PPP method with PPP-B2b service based on constrained coordinates, which tests the accuracy by calculating the coordinate displacement of the measurement station. The results show that the accuracy of PPP-B2b orbits in the radial direction is within 0.1 m. Moreover, regarding the accuracy of clock offsets, the PPP-B2b service is no more than 3.5 cm. This validates the feasibility of replacing RTS products with PPP-B2b. In the 15 min simulated experiments, the root mean square (RMS) of horizontal and vertical directions is maintained within 3 cm.
Highlights
With the developments of the global navigation satellite system (GNSS), its service accuracy has become more precise, and the technical types have become varied [1,2,3,4,5], making it widely used in coseismic displacement retrieval and playing an important role in seismic warning [6,7,8,9]
Simulation experiments on retrieving coseismic displacements are carried out with the coordinate-constrained precise point positioning (PPP) model based on PPP-B2b and CNES products; the displacements are calculated between the initial station coordinates and the subsequent epoch station position, and the displacement errors are used to evaluate positioning performance
The results showed that the PPP-B2b service can paid to the accuracy of the radial direction
Summary
With the developments of the global navigation satellite system (GNSS), its service accuracy has become more precise, and the technical types have become varied [1,2,3,4,5], making it widely used in coseismic displacement retrieval and playing an important role in seismic warning [6,7,8,9]. It is helpful for the extraction of post-earthquake information via remote sensing technology. RTK technology requires precise coordinates of reference stations, but strong earthquakes may cause the true reference coordinates to be shifted
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