Accurate uplink quasi-synchronization time measurement method for low-earth-orbit satellite communication

A low-orbit satellite and satellite communication technology, applied in the field of satellite communication

Active Publication Date: 2015-04-29
上海欧科微航天科技有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

For low-orbit satellite uplink quasi-synchronous access, satellite-ground time reference time difference measurement is realized, and there is no related report

Method used

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  • Accurate uplink quasi-synchronization time measurement method for low-earth-orbit satellite communication
  • Accurate uplink quasi-synchronization time measurement method for low-earth-orbit satellite communication
  • Accurate uplink quasi-synchronization time measurement method for low-earth-orbit satellite communication

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Embodiment Construction

[0039] figure 1 It shows a schematic flow chart of an uplink quasi-synchronous time accurate measurement method for low-orbit satellite communication according to a specific embodiment of the present invention. Specifically, those skilled in the art understand that the low-orbit satellite continuously transmits pilot frequency signal and communicate with several ground terminals in the coverage area of ​​the low-orbit satellite, and the several ground terminals access the low-orbit satellite in a code division multiple access mode, preferably, including the following steps:

[0040] First enter step S101, receive the uplink modulation signal from the ground terminal k. Those skilled in the art understand that the ground terminal k refers to one of several ground terminals within the coverage area of ​​the low-orbit satellite, and the several ground terminals access the low-orbit satellite in a code division multiple access manner. The satellite, specifically, the low-orbit sa...

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Abstract

The invention discloses an accurate single-satellite one-way timing-based uplink quasi-synchronization time measurement method for low-earth-orbit satellite communication. The method comprises the selection of a spread-spectrum sequence of a terminal, error analysis, a testing method and implementation steps. The method is applied to a single-satellite or overlapped coverage area-free multi-satellite communication system, and is used for a satellite payload to accurately measure the time reference error of a satellite and the ground terminal and ensuring the quasi-synchronization window range of dozens of nanoseconds.

Description

technical field [0001] The present invention relates to the field of satellite communication, in particular to an uplink communication technology system in a low-orbit satellite communication system, in particular to a precise uplink quasi-synchronous time measurement method for low-orbit satellite communication. Background technique [0002] With the continuous development of science and technology and the continuous progress of the times, people use the satellite mobile communication system to achieve things that could not be done before. People can use the satellite system to carry out global TV live broadcast, global positioning, military communication, commercial communication, etc., and further According to the working orbit, satellite communication systems can generally be divided into three categories, namely, low-orbit satellite communication systems, medium-orbit satellite communication systems, and high-orbit satellite communication systems. [0003] The low-orbit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00H04B7/185
Inventor 陈毅君梁旭文丁晟吴康侯缋玲
Owner 上海欧科微航天科技有限公司
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