Real-time satellite clock error estimation system and method based on GNSS high precision system

Abstract

The invention provides a real-time satellite clock error estimation system and method based on a GNSS high precision system. According to the method, data is received by a data reception and reading subsystem and is read in real time, and the data is stored and transmitted to a real-time data pre-processing subsystem; the received data is pre-processed by the real-time data pre-processing subsystem to generate observation data after quality inspection; the observation data after quality inspection is utilized by a real-time precise satellite clock error resolution subsystem to resolve the satellite clock error in real time; after the satellite clock error acquired through real-time resolution is acquired by a real-time precise satellite clock error short-period forecast subsystem, a high-precision short period forecast model is utilized to carry out real-time clock error forecast; the real-time clock error forecast is acquired by a clock error product and process file generation subsystem, the correction information of the broadcast clock error is calculated, and clock error products and the process file are stored in real time. The method is advantaged in that precision of the satellite clock error and the update frequency of the satellite clock error can be improved, and real-time high-precision positioning requirements are satisfied.

Description

technical field [0001] The invention relates to the field of satellite technology navigation, in particular to a system and method for real-time estimation of satellite clock error based on a GNSS high-precision system. Background technique [0002] In terms of GNSS (Global Navigation Satellite System, Global Satellite Positioning System) satellite clock error acquisition, the IGS (International GNSS Service, International GNSS Service Organization) analysis center calculates satellite orbits through global IGS station data, and at the same time estimates station coordinates, fuzzy degree, tropospheric delay, and receiver clock error. When estimating the satellite clock error, the orbital parameters, station coordinates, ambiguity parameters, and tropospheric delay parameters are all treated as known values, and only the receiver clock error and satellite clock error are estimated. Difference. The accuracy of ex post satellite clock error estimated by this method can reach ...

AI Technical Summary

Problems solved by technology

The unstable part of the satellite clock still changes rapidly in the present invention, and the accuracy of the satellite clock error for precise single-point positioning is much higher than the clock error accuracy (2.5ns) provided by the current real-time broadcast ephemeris. The accuracy of the fast real-time clock difference is also about 1.5ns, which still cannot meet the technical problems of real-time precise positioning and other technical problems. A system and method for real-time estimation of satellite clock difference based on GNSS high-precision augmentation system are proposed.

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