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In free-space optical (FSO) communication, high-precision pointing is a critical technology required for rapid acquisition to reduce link establishment time and increase communication time. FSO communication on a motion platform is necessary to expand the communication area and to promote the establishment of a global communication network. However, the pointing accuracy of an optical communication terminal on a motion platform is low due to numerous error sources and error coupling. This paper evaluates the error sources and proposes a pointing model to avoid problems resulting from error coupling. This proposed pointing model was designed to improve the pointing accuracy of a gimbals-type optical communication terminal (GOCT) on a motion platform. The effectiveness of the proposed pointing model was verified by tracking star experiments. The modified residual error of the proposed point model was 94.8 &#x03BC;rad compared to 1324.2 &#x03BC;rad without correction. Additionally, the modified residual error was 94.8 &#x03BC;rad of the proposed pointing model compared to 140.2 &#x03BC;rad of the existing model. The actual open-loop pointing error was reduced from 150.4 &#x03BC;rad of the existing model to 101.3 &#x03BC;rad of the proposed model. Thus, the pointing accuracy of a GOCT on a motion platform was significantly improved after correction by the proposed pointing model.

Modeling and Correction of Pointing Errors in Gimbals-Type Optical Communication Terminals on Motion Platforms