Satellite positioning method and device based on B2b signal of Beidou No.3 satellite

Abstract

The invention provides a satellite positioning method and device based on a B2b signal of a Beidou No.3 satellite. The method comprises a step of obtaining original observation data broadcasted by theBeidou No.3 satellite and various correction numbers carried in a broadcasted B2b signal, a step of calculating the orbital and clock-correction numbers of a current time by using orbital and clock-correction numbers of multiple historical broadcasting times, a step of determining a satellite precise orbit and a satellite precise clock correction of the current time according to a broadcast ephemeris and the orbital and clock-correction numbers of the current time, a step of correcting pseudo-range observation values of different frequencies according to an inter-code deviation correction number, and a step of determining the position of equipment to be positioned at the current time according to the satellite precise orbit and the satellite precise clock correction and the corrected pseudo-range observation values. According to the invention, the orbital and clock-correction numbers of the current time are determined by using the correction data of multiple historical broadcast times, the influence of the mismatch of the current time and a play time on the precise orbit and the precise clock correction is weakened, and the high-precision real-time precise positioning is achieved.

Description

technical field [0001] The present application relates to the technical field of navigation and positioning, in particular, to a satellite positioning method and device based on the Beidou-3 B2b signal. Background technique [0002] With the application of Global Navigation Satellite System (GNSS) in real-time location services, disaster early warning, deformation monitoring and other fields, users have gradually put forward the demand for high-precision real-time positioning at decimeter and centimeter levels. At present, the domestic Beidou-3 satellite navigation system can broadcast B2b signals through Geostationary Earth Orbit (GEO) satellites to provide users with real-time correction data to improve the accuracy of positioning results. GEO satellites broadcast satellite orbit corrections, clock error corrections, inter-symbol deviation corrections, etc. at a certain time interval, but affected by the broadcast time interval, if the user directly uses the correction dat...

AI Technical Summary

Problems solved by technology

GEO satellites broadcast satellite orbit corrections, clock error corrections, inter-symbol deviation corrections, etc. at a certain time interval, but affected by the broadcast time interval, if the user directly uses the correction data of the B2b signal, it is bound to be due to the current positioning time and the correction data. The corresponding broadcast time does not match, resulting in Beidou satellite orbit error and clock error, affecting real-time positioning accuracy

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