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SpaceWire network time service and calibration method

A network time service and time calibration technology, applied in the field of aerospace systems, achieves the effects of wide application range, easy promotion, and improved time system accuracy

Active Publication Date: 2015-11-18
SHANGHAI SATELLITE ENG INST
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AI Technical Summary

Problems solved by technology

[0007] The TimeCode of SpaceWire can be used as a means of precise timing, and the transmission rate of the SpaceWire bus can reach up to 400Mbps. However, due to the influence of data skew and amplitude changes on the data transmission process, the actual application of the SpaceWire network The timing accuracy can only reach about 10us

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  • SpaceWire network time service and calibration method
  • SpaceWire network time service and calibration method

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Embodiment Construction

[0038] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0039] In the present embodiment, the SpaceWire network time service provided by the present invention and the method for correcting time include the following steps:

[0040] Step S1: After the timing is performed on the ground, the data processor on the star receives it through multiple SpaceWire channels;

[0041] Step S2: Perform multiple checks on the time codes of multiple SpaceWire channels to ensure that the time codes acquired on the satellite are consistent with the codes sent on the gro...

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Abstract

The invention provides a SpaceWire network time service and calibration method comprises a step 1 of enabling a satellite data processor to perform reception via multiple SpaceWire channels after a ground end gives time service; and a step 2 of performing multiple verification on time service and calibration time codes of the multiple SpaceWire channels in order to guarantee that a time code acquired at a satellite is consistent with a code word sent from the ground end. The step 2 specifically includes modifying satellite time after the time service and calibration time codes of at least two SpaceWire channels are consistent and cancelling satellite time modification if the time service and calibration time codes of at least two SpaceWire channels are inconsistent. The method performs multiple verification on the time service and calibration time codes of the multiple SpaceWire channels so as to guarantee that the time code acquired at satellite is consistent with the code word sent from the ground end.

Description

technical field [0001] The invention relates to aerospace system technology, in particular to a method for time service and calibration of SpaceWire network. Specifically, SpaceWire link is used for satellite-ground time service and time calibration, and SpaceWire signal transmission characteristics are used to distribute and maintain the satellite time. Background technique [0002] Satellite measurement and control and star affairs management are two independent, complex but closely related disciplines. A common research direction of these two disciplines is to improve the time series accuracy between the satellite and the earth and on the satellite. With the continuous development of satellite technology and the intensive development of satellite models, the requirements for this indicator are getting higher and higher. [0003] In order to accurately control the spaceborne equipment (some equipment needs the computer to send indirect instructions with a delay), each eq...

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Application Information

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IPC IPC(8): G04R20/02
Inventor 朱寅东王震肖轩张娟
Owner SHANGHAI SATELLITE ENG INST
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