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A fast recovery method of satellite-to-ground clock error realized by initial synchronization instruction

A fast recovery and initial synchronization technology, applied in the field of satellite navigation, can solve the problem of satellite unavailability and achieve the effects of avoiding unavailable satellites, shortening processing time, and clear principles

Active Publication Date: 2022-08-05
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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  • A fast recovery method of satellite-to-ground clock error realized by initial synchronization instruction
  • A fast recovery method of satellite-to-ground clock error realized by initial synchronization instruction
  • A fast recovery method of satellite-to-ground clock error realized by initial synchronization instruction

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Embodiment Construction

[0022] To make the purposes, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention.

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

[0024] Assume that the satellite's second pulse leads the ground second pulse, such as figure 1 As s...

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Abstract

The invention provides a method for quickly recovering the satellite-ground clock difference realized by using an initial synchronization command. The specific process is as follows: after the satellite stand-alone is powered on or reset, an initial synchronization command is sent to the satellite to complete the satellite-ground initial synchronization; The distance measurement value T downloaded from the machine 1 and the ranging value T received by the ground equipment 2 ; based on the ranging value T 1 and the ranging value T 2 , calculate the satellite-ground clock difference Δt; use the calculated Δt to reversely adjust the transmission channel delay of the ground equipment, send the initial synchronization command to the satellite again, the satellite time scale adjusts the satellite-ground time scale difference Δt backward, and resume the ground equipment launch The channel delay is the initial value, and the adjusted satellite timescale is aligned with the ground timescale. The method can realize the rapid synchronization of the satellite-ground time after the satellite is switched on or off in orbit or reset.

Description

technical field [0001] The invention provides a fast recovery method for satellite-ground clock difference realized by using an initial synchronization instruction, and 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 consisting 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 the satellite time to be synchronized with the ground time. [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 the calibration and maintenance of the time. The initial synchronization function is realized by the satellite's autonomy or ...

Claims

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Application Information

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Patent Type & Authority Patents(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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