Satellite-ground same band optical communication adaptive optical correction system and method based on sodium guide star

Abstract

The invention discloses a satellite-ground same band optical communication adaptive optical correction system and method based on the sodium guide star. The system comprises a ground station telescope(24), a sodium beacon transmitting unit (27), an adaptive optics unit (25) and a signal transceiving unit (26), wherein the ground station telescope (24) is used for transmitting the sodium beacon laser and receiving the sodium beacon light emitted by the sodium guide star and the downstream communication signal light emitted a target, the sodium beacon light is utilized by the adaptive optics unit (25) for wavefront detection to carry out wavefront correction for the received communication signal light, the corrected communication signal light enters the signal transceiving unit (26) for demodulation, and the signal transceiving unit (26) is used for transmitting the uplink communication signal light which is transmitted through the adaptive optics unit ( 25) and the ground station telescope (24) for realizing uplink communication. The system is advantaged in that an adaptive optical correction method is provided for atmospheric laser communication of a same band beacon-less terminal, and signal reception efficiency of a communication terminal machine is improved.

Description

technical field [0001] The invention relates to an adaptive optical correction system and method for satellite-ground optical communication in the same frequency band based on a sodium guide star, belonging to the application field of space laser communication. Background technique [0002] A traditional laser communication terminal includes a beacon transmitting unit, a signal transmitting unit, and a signal receiving unit, and different frequency band rates are used for signal transmission and reception to achieve spectral separation between each unit. With the construction of a space-ground integrated network that requires one-to-many data transmission for communication terminals, traditional laser communication terminals require a beacon transmitter unit and more than two sets of signal transmitter units to realize two-to-two data exchange between different terminals, which is not conducive to the realization of spaceborne communication. Miniaturization, light weight and...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to overcome the problem of wavefront detection and correction of the adaptive optical unit of the ground station in the satellite-to-ground laser communication with no beacon terminal in the same frequency band, the detection of the downlink signal light directly by the wavefront detection system is vulnerable For the interference of uplink signal light scattered by the atmosphere, an adaptive optical correction system and method for satellite-ground optical communication in the same frequency band based on sodium guide star is proposed, that is, the sodium guide star beacon technology is used to generate Artificial sodium beacon, the adaptive optics unit uses the sodium beacon to detect and correct the atmospheric wavefront distortion of the downlink signal light

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