Method and device for suppressing signal fading in laser communication from ground to GEO (geosynchronous) satellite

Abstract

Disclosed are a method and a device for suppressing signal fading in laser communication from ground to a GEO (geosynchronous) satellite. The method includes: measuring intensity fluctuation waveform of downlink beacon light emitted from the GEO satellite by a single-mode fiber on a ground station, and transmitting uplink laser beam along a direction opposite to the downlink beacon light via the same single-mode fiber, and then emitting the uplink laser beam from an end face of the single-mode fiber; modulating to-be-transmitted uplink data waveform according to the reciprocal of the intensity fluctuation waveform of the downlink beacon light measured by the single-mode fiber, driving a laser to emit uplink laser, and transmitting the uplink laser beam to the GEO satellite. Accordingly, atmospheric turbulence and signal fading caused by alignment error of a ground transmitter can be eliminated automatically, and power of laser received by the satellite is stable. In addition, average transmission power of the uplink laser beam can be reduced on the condition of the rated fading probability.

Description

technical field [0001] The invention relates to the technical field of satellite laser communication, in particular to a method for reducing signal fading caused by atmospheric turbulence and alignment errors in uplink laser communication from the ground to geostationary orbit (GEO) satellites, thereby reducing the average transmitted optical power method. Background technique [0002] Satellite laser communication has the advantages of large communication capacity, small size, strong anti-interference ability, and good security performance. It is an important development direction of satellite communication technology. The laser communication from the satellite to the ground and from the ground to the satellite will inevitably be affected by the turbulent layer of the earth's atmosphere. Atmospheric turbulence will distort the wavefront of the laser beam, causing the intensity of the laser signal to fluctuate (flicker) and cause fading. The time scale of the intensity fluc...

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Problems solved by technology

Taking advantage of the fact that the intensity fluctuation of the downlink beacon light at the focal point of the ground receiving optical antenna is consistent with the intensity fluctuation law of the uplink laser beam at the GEO satellite, a single-mode optical fiber is used to measure the intensity fluctuation of the downlink beacon light in real time Waveform, and then use this intensity fluctuation waveform to adaptively control the transmitting power of the uplink laser beam, so that the signal power received by the GEO satellite is stable, thereby suppressing the signal fading of the uplink laser beam, because the light intensity of the uplink laser beam on the satellite and The angle related to the intensity fluctuation of the downlink beacon light at the rear focus of the ground optical antenna is very small, so this turbulent intensity scintillation suppression method can only be applied to the uplink laser communication from the ground station (which can move at high speed) to the GEO satellite

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