Device and method for on-orbit calibration of satellite optical communication terminal and coaxiality correction of transmitting and receiving

Abstract

In the prior art, a satellite optical communication terminal is calibrated in an on-orbit manner through a laser communication ground station. The position of the receiving optical axis can only be calibrated at night; the transmitting-receiving coaxiality of the terminal itself cannot be corrected; the terminal cannot be caught; the communication state is checked; The invention provides a satellite optical communication terminal in-orbit calibration and transceiving coaxiality correction device and method. The device comprises an external calibration transmitting branch, The system comprisesa calibration reflector, a coarse pointing mechanism, an optical antenna, a fine pointing mechanism, a beam splitter I, a beam splitter II, a beam splitter III, an advanced aiming mechanism I, a signal internal calibration transmitting branch, an advanced aiming mechanism II, a beacon internal calibration transmitting branch, a communication receiving branch, a communication detector, a capturingand receiving branch, a capturing and tracking detector, a communication transceiver and a terminal controller. The device and the method can meet the requirement of on-orbit self-calibration of the satellite laser communication terminal, and the coaxiality of the correction transmit-receive optical axis can reach the micro-radian magnitude.

Description

Technical field [0001] The invention belongs to a space laser communication technology, and mainly relates to a device and method for on-orbit calibration and transceiving coaxiality correction of a satellite optical communication terminal. Background technique [0002] Generally, the divergence angle of the beacon signal light of the satellite optical communication terminal is only a few hundred or even tens of microradians, so the transmission and reception coaxiality of the optical system must be controlled within a few microradians. The laser communication terminal launches from the space platform through the ground, the severe vibration after entering orbit, and the thermal deformation after entering the orbit may affect the coaxiality of the optical system's receiving and emitting axis. For two-way full-duplex satellite laser communication equipment, The coaxiality of the transceiver of the optical system determines whether the terminals of both parties can normally establi...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects in the prior art that only the optical axis position of the receiving and receiving optical axis can be calibrated, but the coaxiality of the transmitting and receiving is unable to be corrected, and to provide a device and method for on-orbit calibration of satellite optical communication terminals and correction of the coaxiality of transmitting and receiving. Check the tracking and communication status of satellite optical communication terminals to meet the requirements of satellite laser communication terminals for on-orbit self-calibration

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