A method and system for broadcasting precision orbit and clock difference based on Beidou short message

Abstract

The present invention relates to a method for broadcasting precise orbit and clock difference based on Beidou short message, which includes the following steps: the satellite position of the precise ephemeris and the satellite position of the broadcast ephemeris are processed to generate the agreement ground fixed system XYZ direction Coordinate correction number; the satellite clock error of the precise ephemeris and the satellite clock error of the broadcast ephemeris are processed to generate a clock error correction number; the generated coordinate correction numbers in the XYZ direction of the ground-fixed system are respectively converted to the satellite's radius generate the orbit correction information that needs to be broadcast; average the generated clock corrections to get the average value of the satellite clock corrections, and subtract the satellite clock corrections from the satellite clock corrections Obtain the clock correction information that needs to be broadcasted, and encode the generated orbit correction information and the acquired clock correction information according to the first predetermined format to generate the first message. The invention improves the accuracy of navigation and positioning, and greatly improves the deficiency of poor broadcast ephemeris accuracy.

Description

Technical field [0001] The invention relates to the field of broadcasting of orbit and clock difference in satellite navigation, in particular to a method and system for broadcasting the precise orbit and clock difference based on Beidou short message. Background technique [0002] At present, the real-time orbit and clock offset of known navigation satellites are calculated by using Kepler orbit parameters and orbital perturbation correction items obtained from broadcast ephemeris. The broadcast ephemeris can be directly extracted from satellite signals for use, compared to Ultra-fast and precise ephemeris that need to be obtained online. Broadcast ephemeris is still the most widely used ephemeris source in real-time and non-precision positioning. However, the accuracy of satellite orbits and clock errors calculated through broadcast ephemeris is not high. Quality is the key to the positioning accuracy and reliability of satellite navigation systems, and its errors will directly...

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

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