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

A satellite TV and ephemeris error technology, applied in the field of communications, can solve problems such as large errors, orbit determination errors, and the impact of digital satellite TV high-precision timing, to reduce the impact of timing accuracy, reduce impact, and reduce error items Introduced effects

Active Publication Date: 2020-06-05
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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  • Description
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  • Application Information

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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

Method used

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

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0034] The technical scheme adopted in the present invention comprises the following contents:

[0035] (1) Reference station

[0036] Base stations are built in many cities across the country. The base stations maintain standard time and receive digital TV signals transmitted from satellites through satellite antennas. Second-level timestamp, which is recorded as the base timestamp.

[0037] (2) User receiving end

[0038] The user receiving end searches for all reference stations within a radius of 500 kilometers with itself as a dot according to its own location, which are marked as A 1 , A 2 ,...,A n . The user receiving end receives the downlink signal from the satellite transponder through the satellite antenna, demodulates and outputs an asynchronous serial code ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06H04N7/20
CPCH04J3/0644H04J3/065H04N7/20
Inventor 王善和向渝华宇黄长江高媛媛赵弦
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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