Zero Baseline Self-closed Loop Satellite-Ground Time Synchronization Method in Pseudo-Lite Positioning System

Abstract

The invention discloses a zero base line self-closed-loop satellite and ground time synchronizing method in a pseudo global positioning system. The method comprises the following steps: firstly, a pseudo satellite navigational signal is generated by a pseudo satellite signal generator with trigger pulse serving as time reference and is sent to a closed-loop navigational receiver under the condition of a zero base line; secondly, the closed-loop navigational receiver simultaneously receives a pseudo satellite signal and a space satellite navigational signal and satellite and ground synchronizing clock correction is calculated according to a pseudo satellite distance measurement value and a navigational satellite distance measurement value which are output by the receiver; thirdly, the satellite and ground synchronizing clock correction is processed, a rough clock correction control word and a precise clock correction parameter are obtained, the rough clock correction control word is sent to the signal generator, and satellite and ground rough synchronization is achieved; and fourthly, the precise clock correction parameter is written in a pseudo satellite telegraph text so that satellite and ground precise synchronization is achieved. The zero base line self-closed-loop satellite and ground time synchronizing method in the pseudo global positioning system can achieve high accuracy time synchronization of the pseudo global positioning system and a space satellite navigational system and has the advantages of being low in cost, simple and practical.

Description

technical field [0001] The invention relates to the technical field of satellite navigation ground-based enhancement, in particular to a zero-baseline self-closed-loop satellite-ground time synchronization method in a pseudolite positioning system. Background technique [0002] Pseudo-satellite is a ground navigation signal transmitting device, which is used to support and enhance the service capability of space satellite navigation system. And it can be combined with space navigation satellites, that is, several pseudolites plus space GPS, Beidou and other navigation satellites that do not meet the positioning conditions (less than 4), can realize the satellite-ground combined positioning mode, and can solve the problem caused by the influence of the geographical environment. Insufficient number of visible navigation satellites, poor geometric composition, low signal level and other problems make it impossible to achieve continuous seamless navigation and positioning, and t...

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Problems solved by technology

[0004] The purpose of the present invention is: aiming at the defects of high hardware cost and low synchronization accuracy of the one-way time service receiver synchronization method, a zero-baseline self-closed loop satellite-ground time synchronization method is designed to effectively solve the ground pseudolite time reference and space Beidou / The problem of high-precision time synchronization between GPS navigation satellite time references

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