A Method of Reducing the Influence of Ephemeris Errors on the Timing Accuracy of Digital Satellite TV

Abstract

The invention provides a method for reducing the influence of an ephemeris error on the timing accuracy of a digital satellite television. The method comprises constructing a plurality of reference stations in a time service zone, wherein the reference stations maintain the standard time and receive a digital television signal forwarded from a satellite; enabling a user receiving end to search allreference stations within a certain radius and to receive a downlink signal from a satellite transponder; selecting the reference station whose distance from the user receiving end is less than a setthreshold, or assigning different weights to multiple reference stations to calculate the clock difference of the user receiving end. The method avoids the measurement of the uplink delay of the digital satellite television signal and the delay of the satellite transponder, reduces the introduction of an error term, can greatly reduce the influence of the ephemeris error on the timing accuracy bythe weighting calculation of the reference stations, and reduces the influence of the coarse error of a certain reference station on the timing accuracy. The method improves the accuracy and stability of the digital satellite television time service system.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a timing method. Background technique [0002] Digital satellite TV high-precision time service is a time service method that uses the existing digital satellite TV system to transmit high-precision time information. The precise ephemeris of the satellites that relay television signals is critical to achieving high-precision timing. When using the digital satellite TV timing system orbit determination method to determine the satellite orbit, there are often several meters or even larger orbit determination errors, especially when the satellite is maneuvering, the error will be larger, which has a great impact on the high-precision timing of digital satellite TV. influences. How to reduce and reduce the impact of satellite ephemeris error on digital satellite TV timing accuracy is a technical problem that needs to be solved urgently to improve digital satellite...

AI Technical Summary

Problems solved by technology

When using the digital satellite TV timing system orbit determination method to determine the satellite orbit, there are often several meters or even larger orbit determination errors, especially when the satellite is maneuvering, the error will be larger, which has a great impact on the high-precision timing of digital satellite TV. influences

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