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Method for establishing laser link between low orbit safellite and ground station

A low-orbit, ground station technology, applied in satellite communication transmission, free space transmission, electromagnetic wave transmission system, etc., can solve the problem of long capture time, achieve high capture probability, shorten capture time, and ensure rapid establishment and follow-up communication Effect

Inactive Publication Date: 2006-08-30
HARBIN INST OF TECH
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Problems solved by technology

[0003] In order to solve the problem that both the existing ground terminal and the satellite terminal need to scan when performing laser links, resulting in a long capture time, the present invention provides a method for establishing a laser link between a low-orbit satellite and a ground station , the method proceeds as follows:

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  • Method for establishing laser link between low orbit safellite and ground station

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Embodiment Construction

[0014] The method for establishing the laser link between the low-orbit satellite and the ground station of the specific embodiment has a capture probability ≥ 95% for the satellite-ground laser communication link, and a maximum capture time ≤ 60s (capture uncertainty angle: 0.46° on the star, 0.46° on the ground, 0.08°) performance index requirements, according to the following steps:

[0015] 1. The ground optical communication terminal is ready 01; then, the ground optical communication terminal judges whether to enter the laser link range 02 according to the system clock. If the ground optical communication terminal does not enter the laser link range, the ground optical communication terminal continues to prepare; if the ground When the optical communication terminal enters the range of the laser link, the ground optical communication terminal uses the known satellite orbit and attitude parameters to perform a rough scan or skip scan 03, and the ground optical communicatio...

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Abstract

This invention relates to a method for setting up laser links between a low orbit satellite and the ground station, after the satellite and ground terminals enter into the link sphere, they aim roughly first, the ground terminal emits a capture beacon light and its beam divergence angle is at least in the uncertainty sphere of its communication terminal, the satellite terminal carries out capture and scan from inside to outside in the mode of screw in the uncertainty sphere and sends back a response signal to the ground and enters into the track state when it captures the beacon light and the ground terminal captures the response light signals and enters into the track state to set up the laser link, which applies a single-way scanning to replace the ordinary two-way.

Description

technical field [0001] The invention relates to the technical field of satellite-ground laser link. Background technique [0002] Satellite-to-earth laser link technology is the core technology of satellite networking and high-speed real-time communication. Road establishment technology is very difficult to achieve. Considering the influence of the atmosphere on laser transmission, the laser link is usually started when the elevation angle of the optical ground station is greater than 30° (this range is called the linkable range). Prior to this, on-board terminals and ground terminals need system preparations, such as preheating and self-inspection. After the satellite enters the linkable range, the two terminals aim according to the satellite orbit and attitude parameters respectively. This process is called rough aiming. Due to the difference between the actual satellite orbit and attitude parameters and the values ​​obtained by the terminal, there is a certain angle er...

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Application Information

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IPC IPC(8): H04B10/105H04B10/118
Inventor 谭立英马晶于思源韩琦琦
Owner HARBIN INST OF TECH
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