Method and system based on big dipper short message precision track and clock correction broadcasting

Abstract

The invention relates to a method and a system based on a big dipper short message precision track and clock correction broadcasting. The method comprises steps of performing difference processing on the positions of a satellite position of a precise ephemeris and a satellite position of a broadcasting ephemeris to generate coordinate correction in a protocol earth-fixing system XYZ direction, performing difference processing on the satellite clock difference of the precise ephemeris and the satellite clock difference of the broadcasting satellite, correspondingly converting the generated coordinate correction in the earth-fixing system XYZ direction to the radial direction, the tangential direction and the normal direction of the satellite, generating track correction information needed to be broadcasted, performing averaging processing on the generated clock difference correction to obtain an average value of the satellite difference correction, subtracting average value of the satellite clock difference correction from the satellite clock difference correction to obtain clock correction information to be broadcasted, and performing data encoding on the generated track correction information and obtained clock difference correction information to generate first information according to a first preset format. The invention improves the navigation positioning precision and greatly improves the shortcoming of poor precision of the broadcast ephemeris.

Description

technical field [0001] The invention relates to the broadcast field of orbit and clock difference in satellite navigation, in particular to a method and system for broadcasting precise orbit and clock difference based on Beidou short messages. Background technique [0002] At present, the real-time orbit and clock error of known navigation satellites are calculated by using the Kepler orbit parameters and orbit perturbation correction items obtained in the broadcast ephemeris, and the broadcast ephemeris can be directly extracted and used from satellite signals, compared with The ultra-fast and precise ephemeris that needs to be obtained online, the broadcast ephemeris is still the most widely used source of ephemeris in real-time and non-precision positioning, but the accuracy of the satellite orbit and clock error calculated through the broadcast ephemeris is not high, the satellite ephemeris Quality is the key to the positioning accuracy and reliability of satellite navig...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a message, method and system based on the Beidou short message precision orbit and clock difference broadcast to overcome the problem of poor broadcast ephemeris accuracy

Images