Tracking system of satellite-ground quantum communication link direction

Abstract

The invention discloses a tracking system of a satellite-ground quantum communication link direction, aiming at the application background of the high-precision beaconing tracking of satellite-groundquantum communication, and provides a real-time high-precision high-bandwidth beaconing detection and information acquiring system of FPGA hardware image processing and information extraction based ona CMOS or CCD detector and adopts an integrated design method. The invention also proposes a beaconing facula image processing method with the combination of facula shaping and position extraction, inhibits the interrupting influence of an atmosphere turbulence signal channel between a satellite and the ground on the beaconing facula, and improves the tracking and pointing precision, bandwidth and stability of a capturing tracking system. Under the condition that the atmosphere turbulence exists, the detection precision of the system on beaconing laser is better than 0.5 mu rad, and the detection bandwidth is higher than 2.5 kHz. The invention satisfies the requirement of the satellite-ground quantum communication capturing tracking system, in particular a satellite-carried terminal.

Description

technical field [0001] The invention belongs to the technical field of quantum communication, and specifically refers to a system for extracting and tracking the direction of a communication link, which is applied in satellite-to-earth quantum communication. Background technique [0002] Quantum communication has higher pointing accuracy requirements for communication links than conventional free-space laser communication. The Acquisition, Tracking and Targeting (ATP) system of satellite-to-earth quantum communication is used to establish a quantum communication link between quantum communication terminals, and must have very high tracking and targeting accuracy, bandwidth and stability. The communication link direction extraction and tracking sub-module of the capture tracking system must have higher performance. [0003] Currently known communication link direction extraction and tracking systems that use CCD or CMOS image sensors as detectors for inter-satellite quantum ...

AI Technical Summary

Problems solved by technology

The internal operation delay of each functional module plus the data transmission delay between modules causes a large total signal delay in the closed loop of the system, reaching 3ms or even longer, which limits the tracking and targeting suppression bandwidth of the capture and tracking system

[0005] 2. No measures have been taken to suppress the interference of atmospheric turbulence on the satellite-earth quantum communication link, or the suppression measures taken have very limited effects, even under good atmospheric conditions, the optimal detection accuracy is about 1-2 μrad

[0006] 3. The composition of the system is complex, the volume and weight are large, and it is not suitable as a spaceborne quantum communication device

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