Free space optical-communication APT system and method based on compressive sensing receiver

Abstract

The invention relates to a free space optical-communication APT system based on a compressive sensing receiver. The free space optical-communication APT system based on the compressive sensing receiver comprises an APT system body and the compressive sensing receiver, wherein the APT system body comprises an optical portion and a servo control portion. The optical portion of the APT system body comprises primary mirrors, secondary mirrors, a precise-tracking executing mechanism, a beam splitter, a pulse amplitude modulation, a first convergence light receiving unit, a light spot detecting device, an emitter and a beam expanding collimating lens. The servo control portion of the APT system body comprises a rough-tracking controller, a rough-tracking executing mechanism, a universal angle plate and a precise-tracking loop controller. The compressive sensing receiver comprises an emitter, an imaging lens, a space light modulator module, a convergence light receiving module, point detectors, an adder and an algorithm module.

Description

technical field [0001] The invention relates to the field of free space optical communication, in particular to a free space optical communication APT system based on compressed sensing receiver. Background technique [0002] The joint team of the Chinese Academy of Sciences and Tsinghua University achieved 16 kilometers of free space quantum teleportation as early as 2010. Then, in October 2011, the team of Pan Jianwei of the University of Science and Technology of China realized hundreds of kilometers of free space equivalent to the thickness of the atmosphere in Qinghai Lake. Quantum teleportation and entanglement distribution have triggered a great upsurge in the fields of physics and quantum communication. It is foreseeable that this technology will be widely used in space quantum communication. In free space optical communication, due to the long communication distance and narrow beam, there are system errors and external interference (such as atmospheric scattering, p...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, most space optical communication systems at home and abroad adopt the coarse-fine compound axis control structure to realize the tracking system with large field of view, high precision and high closed-loop bandwidth, but the decoupling problem of the coarse-fine control loop is the complex axis control structure. An important problem and drawback in , it will affect the performance and accuracy of the entire APT system

The reason is that if it is a compound axis control structure with a single detector, both the rough control loop and the fine control loop use the offset value of the same detector to detect the beam, so the decoupling problem needs to be solved by a

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