Satellite time synchronization system

A time synchronization system and satellite technology, applied in transmission systems, synchronization devices, digital transmission systems, etc., to achieve the effect of maintaining time unity and maintaining high precision of the whole satellite

Active Publication Date: 2013-01-16
BEIJING INST OF SPACECRAFT SYST ENG
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Problems solved by technology

Obviously, the existing methods can no longer meet such demands.

Method used

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Embodiment Construction

[0019] In order to make space vehicles such as satellites meet the requirements of high measurement accuracy or high remote sensing positioning accuracy, and realize the same time reference for the working time of each measurement device in the entire satellite, the invention proposes a high-precision time synchronization system for satellites.

[0020] The satellite high-precision time synchronization system proposed by the present invention is composed of three parts: the time sending part, the time transmitting part and the time receiving part, and its system is constituted as follows figure 1 shown.

[0021] 1. Time sending part

[0022] The time sending part is composed of a high stability time unit, an on-board GNSS receiving unit, a central processing unit, and a second pulse sending unit.

[0023] The high stability time unit provides a highly stable clock signal for the on-board GNSS receiving unit and the central processing unit, and serves as the local clock of the...

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Abstract

The invention discloses a satellite time synchronization system. The satellite time synchronization system comprises a time sending part, a time transmitting part and a time receiving part, wherein the time sending part generates accurate universal time coordinated (UTC) time by receiving a global navigation satellite system (GNSS) navigation signal, and sending out a pulse per second corresponding to a UTC whole second moment; the time transmitting part transmits the pulse per second and UTC whole second moment information corresponding to the pulse per second to the time receiving part; the time receiving part receives the pulse per second and the UTC whole second moment information corresponding to the pulse per second, pulse per second serves as a trigger point, and a local clock counts to obtain accurate current time. By adopting a high-precision satellite time synchronization system provided by the invention, each piece of measurement equipment for the satellite can work on the same time reference; measured data can be accurately matched according to the time information when processed on the ground; and the measurement precision of remote sensing data or scientific detection data is improved.

Description

technical field [0001] The invention relates to a satellite time synchronization system. Background technique [0002] For space vehicles such as satellites, when performing tasks such as space remote sensing and scientific exploration, in order to ensure the accuracy of measurement data, it is necessary to unify the working time of each spaceborne measurement device so that each measurement device works on the same time reference, so that Each measurement data can be accurately matched according to the time information when processing on the ground, so as to improve the measurement accuracy of remote sensing data or scientific detection data. [0003] Taking low-orbit remote sensing satellites as an example, in order to ensure the positioning accuracy of remote sensing image products, remote sensing data (images) and related measurement data (satellite orbit, position, attitude, camera-related parameters) must have the same time reference, which requires the satellite The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/185H04L7/00G04R40/06
Inventor 刘宁黄缙张新伟李少辉任放
Owner BEIJING INST OF SPACECRAFT SYST ENG
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