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Moonlet high-precision time synchronization method

A time synchronization and high-precision technology, applied in the direction of synchronization device, radio transmission system, digital transmission system, etc., can solve the problem that the design method of the small satellite time system cannot meet the requirements, and achieve the effect of simple, reliable, and guaranteed accuracy.

Inactive Publication Date: 2011-09-28
AEROSPACE DONGFANGHONG SATELLITE
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  • Claims
  • Application Information

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Problems solved by technology

The design method of small satellite time system in the past can no longer meet the requirements

Method used

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  • Moonlet high-precision time synchronization method
  • Moonlet high-precision time synchronization method
  • Moonlet high-precision time synchronization method

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Embodiment Construction

[0019] The invention provides a small satellite high-precision time synchronization method, such as image 3 As shown, follow the steps below:

[0020] (1) Install two mutually backup GPS receivers on the small satellite, and only one GPS receiver works at the same time, and each GPS receiver can output 2 GPS second pulse signals;

[0021] The central control unit, surveying camera and high-resolution camera on the small satellite simultaneously receive the 2-way GPS second pulse signal output by the GPS receiver as a timing reference;

[0022] (2) within 50ms of the GPS receiver outputting the second pulse signal, the GPS receiver is used as the master node of the CAN bus on the small satellite and the whole second time synchronization broadcast data corresponding to the second pulse signal is sent by the GPS receiver, and at the same time The full-second time-synchronization broadcast data corresponding to the second pulse signal sent by the GPS receiver is set as the highe...

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Abstract

The invention relates to a moonlet high-precision time synchronization method which comprises the following steps of: (1) installing two GPS (Global Position System) receivers of mutual backup on a moonlet; sending GPS second pulse signals as a time reference; (2) after the GPS receivers output the second pulse signals for 50ms, regarding the GPS receivers as main nodes of a CAN (Controller Area Network) bus on the moonlet; sending broadcasting data of time setting at a whole second corresponding to the second pulse signals by the GPS receivers, wherein the CAN bus on the moonlet adopts a limited multi-host communication working mode; and (3) generating a corresponding time scale according to the received GPS second pulse signals and the corresponding broadcasting data of time setting at the whole second so as to realize time synchronization. The method provided by the invention is simple and reliable in realization; and because the time of each part related to payloads on the moonlet is from the GPS receivers with very high precision, the synchronization precision can also be ensured.

Description

technical field [0001] The invention relates to a high-precision time synchronization method for small satellites. Background technique [0002] In the past, the time reference of both the platform system and the payload system on small satellites used a separate external clock to provide the timing reference, and the computer of the star service center sent the whole satellite time through the first-level CAN bus in the form of broadcast, and the related time system users Receive the whole star time through the CAN bus to complete its own time calibration. This method has a synchronization accuracy of about 5ms among users of each time system, which cannot meet the requirements for high-precision time synchronization. [0003] With the continuous expansion of the application field of small satellites, small satellites used in surveying and mapping, land survey and other applications require the time synchronization accuracy of the payload to be better than 0.1ms to meet the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/185H04L7/00
Inventor 李岩史简张可立王明波曹启鹏
Owner AEROSPACE DONGFANGHONG SATELLITE
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