Multi-optical axis parallel calibration method for ground laser terminal based on star sensor

Abstract

The invention provides a multi-optical axis parallel calibration method for a ground laser terminal based on a star sensor. The method includes: firstly, a star sensor is installed next to the transceiver antenna of the ground laser terminal, and 10-15 stars are selected as the calibration source, and then the ground laser terminal calculates the aiming angle of the star marked n according to the star map information, and the coarse aiming device records The angle position of the control feedback after aiming is completed. If there is no light spot of the star on the field of view of the star sensor, the coarse pointing device scans and detects the position of the light spot. After the star sensor detects the position of the star’s light spot, calculate the correction angle of the rough pointing device ;Adjust the aiming angle of the rough aiming device according to the correction angle, record the control feedback angle position after the aiming is completed, and obtain the calibration pointing error amount, and use the fine aiming device of the optical path behind each sending and receiving antenna to correct the optical axis offset; finally take n =n+1, return to the aiming step until n=15. The invention has the advantages of small size, comprehensive calibration range and the like.

Description

technical field [0001] The invention relates to a multi-optical axis parallel calibration method for a ground laser terminal based on a star sensor, and belongs to the technical field of laser communication. Background technique [0002] Compared with the existing microwave communication technology, satellite-ground laser communication technology has significant advantages such as high data rate, anti-interference and good confidentiality, and can realize high-speed downlink transmission of remote sensing data from satellite platforms. Despite the potential advantages of laser communication, the availability of satellite-to-ground laser links is greatly affected by atmospheric turbulence effects such as pointing stability affected by heavy rain, fog, snow, clouds, and wind. [0003] In the satellite-to-ground laser link system, in order to reduce the influence of the atmosphere on the laser signal transmission, the ground laser terminal basically adopts a multi-channel trans...

AI Technical Summary

Problems solved by technology

[0004] The main problems of the existing multi-optical axis parallel calibration method are: (1) The volume and weight of the calibration device is large, which is not convenient for outdoor use; (2) There are few calibration states, and only the low elevation angle state of the ground laser terminal can be calibrated. Cannot be calibrated at high elevation angles, and the calibration effect is poor

For ground laser terminals installed on vehicle / ship platforms, the existing multi-optical axis parallel calibration methods cannot meet the requirements in terms of volume weight, test coverage, etc.

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