Multi-optical-path optical axis automatic coaxial laser communication ground terminal and coaxial control method

Abstract

The invention provides a multi-optical-path optical axis automatic coaxial laser communication ground terminal and a coaxial control method. The terminal comprises a transmitting light path, a signal receiving light path and a tracking light path, the transmitting light path and the receiving light path are combined through a first beam splitter, the receiving light path is divided into two paths through a second beam splitter, one path is used as a signal receiving light path, and the other path is used as a tracking light path; the terminal further comprises a paraxial reference light beam in a transmitting light path and a paraxial reference light beam in a signal receiving light path; a turning plane mirror is arranged at the position of a middle image plane of the terminal, so that a transmitting light path and a signal receiving light path are reflected through the turning plane mirror, a reference optical fiber is embedded in the position, with the effective aperture distance being s from a working light beam of the turning plane mirror, of the turning plane mirror, and the end face of the reference optical fiber and the turning plane mirror are coplanar, and used for receiving the paraxial reference light beam in the transmitting light path and the paraxial reference light beam in the signal receiving light path. According to the invention, each optical path can continuously and stably maintain good coaxiality in the use process of the terminal.

Description

technical field [0001] The invention relates to a laser communication ground terminal and a coaxial control method with multiple optical paths and optical axes automatic coaxial, and belongs to the technical field of ground terminals for satellite-to-ground laser communication. Background technique [0002] Compared with the existing microwave communication technology, satellite laser communication technology has significant advantages such as high data rate, anti-interference and good confidentiality, and is an effective supplementary technical means for satellite communication in the future. At present, a number of satellite optical communication on-orbit tests have been carried out at home and abroad, and military and commercial aerospace applications are being gradually developed. [0003] The current ground terminal in satellite-to-ground laser communication generally has a caliber of 500~1500mm. On the one hand, due to the need to be in an open outdoor environment whe...

AI Technical Summary

Problems solved by technology

This method mainly has the following technical problems: (1) After calibration, the optical axis consistency error of each optical path gradually changes with time and temperature distribution field conditions, which is difficult to maintain for a long time and requires high timeliness of calibration; (2) ) There are still strict requirements on the optical-mechanical structure design of the ground terminal, and it is necessary to use structural materials with low expansion coefficients and optical materials with low expansion coefficients to reduce temperature sensitivity, resulting in heavy weight of the entire ground terminal and limited control performance , and the cost is high; (3) The optical axis calibration process of the ground terminal takes a long time, and it cannot maintain stable work for a long time after calibration, which reduces the use efficiency of the ground terminal

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