Navigation satellite autonomous time synchronization method based on synthetic aperture observation

Abstract

The invention provides a navigation satellite autonomous time synchronization method based on synthetic aperture observation. The method comprises the following steps: all the cooperative observation satellites and a reference satellite perform timing observation on the same millisecond pulsar at the same time; the reference satellite completes time delay correction between each cooperative observation satellite and the reference satellite by the relative position measurement data between satellites at different times, and stacks each group of observation data completing the time delay correction to obtain the observation waveform of a synthetic aperture timing observation system; the clock error of an onboard clock of the reference satellite is measured; and the clock error between each satellite of a navigation constellation and a standard time TCB is measured and the clock error correction value is broadcast in the broadcast ephemeris of each satellite so as to complete the autonomous time synchronization of the navigation satellite. The method achieves the technical effects of reducing the X-ray detector load of the navigation satellite, shortening the observation time, and improving the autonomous time synchronization precision and real-time property of the navigation satellite.

Description

technical field [0001] The invention belongs to the technical field of autonomous navigation of spacecraft, and relates to a method for performing high-precision time synchronization for navigation satellites by using X-ray signals radiated by pulsars. Background technique [0002] The satellite navigation system is a space-based radio navigation positioning and time transfer system. It is a space infrastructure for real-time acquisition of high-precision measurement information. It can provide all-weather, all-time, high-precision Navigation information services such as position, speed and time. A complete satellite navigation system includes three major components, namely the space constellation part (navigation constellation), the ground control part and the user terminal part. Among them, the ground control part consists of multiple monitoring stations and injection stations distributed around the world, as well as a main control center station, which is responsible for...

AI Technical Summary

Problems solved by technology

[0017] In order to overcome the shortcomings of low signal-to-noise ratio and difficult identification of observation signals in the existing pulsar autonomous navigation technology, the present invention proposes a comprehensive aperture observation scheme in the X-ray band, without increasing the detector area and extending the In the case of observation time, it solves the problem of weak signal detection in the autonomous time synchronization of pulsar-based navigation constellations, with high measurement accuracy and easy implementation

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