Satellite-ground clock error rapid recovery method realized by using initial synchronization instruction

A technology for rapid recovery and initial synchronization, applied in the field of satellite navigation, it can solve problems such as unavailability of satellites, and achieve the effects of avoiding no satellites available, shortening disposal time, and saving waiting time.

Active Publication Date: 2020-07-17
BEIJING INST OF SPACECRAFT SYST ENG
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Problems solved by technology

Therefore, when fine synchronization is required after the initial synchronization is completed, the traditional phase modulation method needs to wait for the command to take effect at 00:00:00 the next day. During this period of waiting for the command to take effect, the satellite will be in an unavailable state

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  • Satellite-ground clock error rapid recovery method realized by using initial synchronization instruction
  • Satellite-ground clock error rapid recovery method realized by using initial synchronization instruction
  • Satellite-ground clock error rapid recovery method realized by using initial synchronization instruction

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Embodiment Construction

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0023] In order to quickly realize the satellite-ground time synchronization and restore the satellite to an available state, the present invention proposes a method for quickly recovering the satellite-ground clock difference by using an initial synchronization command. The satellite-to-ground clock difference can be adjusted without using phase modulation commands, and the satellite time and the ground time synchronization device time can be adjusted to within 1ms immediately to complete the precise synchronization of the satellite-to-ground time.

[0024] Assuming that the second pulse of the satellite is ahead of the second pulse of the ground, such as fig...

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Abstract

The invention provides a satellite-to-ground clock error rapid recovery method realized by using an initial synchronization instruction, which comprises the following specific steps: after a satellitesingle machine is turned on and off or reset, sending the initial synchronization instruction to a satellite to complete satellite-to-ground initial synchronization; obtaining a distance measurementvalue T1 downloaded by a satellite spread spectrum distance measurement receiver and a distance measurement value T2 received by ground equipment; calculating a satellite-ground clock error delta t based on the distance measurement value T1 and the distance measurement value T2; and reversely adjusting the time delay of the ground equipment emission channel by utilizing the calculated delta t, sending the initial synchronization instruction to the satellite again, adjusting the satellite-ground time scale difference delta t backwards by the satellite time scale, recovering the time delay of the ground equipment emission channel to an initial value, and aligning the adjusted satellite time scale with the ground time scale at any time. The method can achieve the quick synchronization of thesatellite-ground time after the on-orbit startup and shutdown or resetting of the satellite.

Description

technical field [0001] The invention proposes a method for quickly recovering the satellite-earth clock difference realized by an initial synchronization command, which belongs to the technical field of satellite navigation. Background technique [0002] The Beidou-2 navigation system is my country's second-generation satellite positioning and navigation system. It has formed a regional navigation system composed of 5 GEO satellites + 4 MEO satellites + 5 IGSO satellites. According to the overall requirements of the project, the stable operation of the Beidou-2 navigation system requires that the satellite time and the ground time synchronization equipment time, that is, the satellite ground time be accurately synchronized to within 1ms. [0003] After the satellite is launched into orbit, it establishes synchronization with the ground system through the initial synchronization function, obtains the time of the ground system, and completes time calibration and maintenance. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/185H04L7/00G01S19/27
CPCH04B7/18519H04L7/0033G01S19/27
Inventor 王妍赵伟余速申洋赫赵峰崔永军齐阳官文涛刘哲吕笑慰
Owner BEIJING INST OF SPACECRAFT SYST ENG
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