Satellite orbit clock error correction coding method based on Beidou global short message communication

Abstract

The invention provides a satellite orbit clock error correction coding method based on Beidou global short message communication, which aims at improving the real-time precision single-point positioning precision and convergence speed and takes the minimum space signal ranging error SISRE as the principle to realize coding within the limitation of Beidou global short message nodes. The method comprises: judging the satellite data according to the satellite orbit, the effective range of the clock error correction and the satellite elevation angle, and selecting a satellite; performing data processing and encoding of satellite orbital clock correction, including determining data lengths and encoding scales of satellite radial, normal and tangential orbital correction and clock correction according to a principle of minimum space signal range finding error SISRE, taking integers of the radial, normal and tangential orbital correction and clock correction of each satellite according to the encoding specified scale, and encoding the data length of the satellite orbital clock correction and the encoding scale of the satellite orbital clock correction; finally, converting the header file and the rounded satellite data into binary data; and sequentially adding information according to a sequence specified by a coding format, supplementing 0, and adding and calculating a CRC check code to form a complete telegraph text.

Description

technical field [0001] This patent belongs to the field of GNSS navigation and positioning. It is a coding method for broadcasting satellite orbit clock error correction numbers by using the Beidou global short message communication function to achieve real-time precise positioning. Background technique [0002] At present, there are four global satellite navigation systems in the world: GPS, BDS, Galileo and GLONASS. my country's Beidou satellite navigation system is the only system that can realize real-time positioning and short message communication at the same time, and can provide users with all-weather high-precision positioning and precise timing. And large-scale, long-distance real-time short message communication services, etc. The short message communication realized by Beidou can allow two-way data transmission between users and between users and between users and the ground control center. Compared with existing common communication methods such as GPRS / CDMA / 3G,...

AI Technical Summary

Problems solved by technology

Considering that each Beidou global short message has a data length limit of 560 bits, in order to ensure the accuracy of the satellite orbit clock error correction number to achieve high-precision positioning, users cannot use the RTCM3.2 coding scheme

On the other hand, each correction number affects the accuracy of GNSS precise single-point positioning to different degrees, and the encoding method with the same encoding loss accuracy of each correction number is not the most ideal method for GNSS positioning

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