Quantum communication ATP (array transform processor) precise tracking system with optical axis self-calibrating function and calibrating method thereof

Abstract

The invention discloses a quantum communication ATP (array transform processor) precise tracking system with an optical axis self-calibrating function and a calibrating method thereof, aiming at overcoming the problem that the center of the quantum light emitting optical axis and the visual field center of the precise tracking camera are inconsistent owning to emitting vibration, on-track weight loss, thermal gradient and the like. The precise tracking system consisting of a pyramidal prism, a quick directing mirror, a CMOS (complementary metal-oxide-semiconductor) camera, a quantum emitting module, a color-separating piece and the like is adopted, and a path of strong light of other wavelength is introduced in the quantum emitting module by an optical fiber combiner and is used as a self-calibrating light. Before the instrument works, the self-calibrating light is introduced in the camera to form images by a track selector; the position of the mass center of light spot is calculated and is used as the visual axis center during tracking external target. The established inter-satellite or satellite-ground optical link can lead the ATP system to capture and precisely track the target at the receiving end and to exactly send the quantum signal to the receiving end along the optical link simultaneously, thus ensuring to successfully realize the spatial scale quantum communication.

Description

Technical field: [0001] The invention relates to an optical axis self-calibration system and method in an optical system, in particular to a space quantum communication ATP fine tracking system and a calibration method with optical axis self-calibration. Background technique: [0002] In satellite-ground or inter-satellite quantum communication, due to the long communication distance, narrow beam and external interference (such as atmospheric influence, satellite vibration, etc.), acquisition (Acquisition), tracking (Tracking) and aiming (Pointing) systems must be used to establish Maintain an optical communication link. The system is referred to as the ATP system. In the ATP system, one side of the communication link emits a wider beacon light to scan, and the other side searches for the beacon light. The beacon light enters the detector's field of view and is detected correctly. This process is called capture; after the ATP system captures the beacon light, both parties ...

AI Technical Summary

Problems solved by technology

However, due to the characteristics of quantum communication, the quantum laser and the time-synchronized light itself are two separate and different optical paths, and it is impossible to use the time-synchronized optical path of the transmitter of the ATP system to completely replace the quantum optical path for detection and self-calibration

Therefore, there is no really effective way to enable the spaceborne equipment to automatically calibrate the optical path when it is working

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