Correcting method for intersite time synchronization errors caused by synchronous satellite motion

Abstract

The invention discloses a correcting method for intersite time synchronization errors caused by synchronous satellite motion. The correcting method is used for correcting measurement errors, caused by motion of synchronous orbit satellites in charge of information forwarding, of wireless time transmission information between double sites. According to the method, orbit information of the synchronous satellites is obtained, accurate point location coordinates of the known double ground sites are combined, and a computer is used for calculating the measurement errors of wireless time and frequency between the double sites in real time to obtain a change rule of the measurement errors caused by fine precessional motion of the synchronous satellites. A measurement error model and actual measurement values between the double sites are offset in real time to achieve the purpose of eliminating the intersite time synchronization errors caused by synchronous satellite motion. The method is suitable for correcting time and frequency transmission errors, caused by synchronous satellite motion, of the double sites and particularly suitable for a two-way satellite time and frequency transfer (TWSTFT) system of the nonsynchronous long-distance double sites.

Description

technical field [0001] The invention relates to a correction method for inter-station time synchronization error caused by synchronous satellite movement. It is a correction method for the measurement error of wireless time transfer information between two stations due to the movement of the geostationary orbit satellite responsible for forwarding information. The method is suitable for the correction of various bi-station time and frequency transfer errors caused by synchronous satellite movement, and is especially suitable for the non-synchronous long-distance dual-station satellite two-way time transfer (TWSTFT) system. Background technique [0002] The premise of the realization of satellite two-way time transfer (TWSTFT) technology is that the two ground stations for time and frequency transfer have achieved a relatively high-precision coarse synchronization, and this synchronization accuracy is generally better than that of the subtle order. In this case, the transmis...

AI Technical Summary

Problems solved by technology

These systems are not equipped with high-precision atomic clocks, and it is even difficult to synchronize their system time with standard time to the order of ms

When these systems use TWSTFT technology, it is inevitable to encounter measurement errors in the wireless time transfer information between the two stations due to the movement of the geostationary orbit satellite responsible for forwarding information.

This error can often reach tens of ns, which greatly exceeds the application accuracy of TWSTFT technology

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