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

Abstract

The invention provides a laser communication ground terminal and a coaxial control method for automatic coaxial multi-optical path optical axes. The invention includes a transmitting optical path, a signal receiving optical path, and a tracking optical path; the emitting optical path and the receiving optical path are combined through a beam splitter, and the receiving optical path is split into two paths through a beam splitter, one of which is used as a signal receiving optical path, and the other is used for tracking Optical path; also includes the paraxial reference beam in the transmitting optical path and the paraxial reference beam in the signal receiving optical path; a folding plane mirror is set at the intermediate image plane of the terminal, so that the transmitting optical path and the signal receiving optical path are reflected by the folding plane mirror , a reference optical fiber is embedded at the effective aperture distance s from the working beam on the folding plane mirror and makes the end face of the reference fiber coplanar with the folding plane mirror, for receiving the paraxial reference beam and signal in the emission optical path Receive the paraxial reference beam in the optical path. The invention realizes that each optical path maintains good coaxiality continuously and stably during terminal use.

Description

Technical field [0001] The present invention relates to a multi-optical optical axis automatic coaxial laser communication ground terminal and coaxial control method, which belongs to the field terminal technology of Star Laser communication. Background technique [0002] Compared with existing microwave communication technology, satellite laser communication technology has a significant advantage of high data rate, anti-interference and good confidentiality, and is an effective supplementary technical means of future satellite communications. At present, many satellite optical communications have been carried out in terms of domestic and foreign, and military and commercial space applications are being gradually carried out. [0003] The general diameter of the ground terminal in the laser communication in the current starland is 500 to 1500 mm. On the one hand, since the open outdoor environment is required, the diameter is large, and the whole machine cannot be in good tempera...

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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