| Citation: | GUO Ming, FAN Yi-di, WANG Peng-cheng, AN Ke, LU Wei, CHEN Wen, ZHANG Yong-he, LIN Bao-jun. High-precision beam pointing control based on global non-singular attitude estimation[J]. Chinese Optics. doi: 10.37188/CO.EN-2026-0004
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Focusing on the key problem of establishing inter-spacecraft laser links for space-borne gravitational wave (GW) detection, this paper presents a high-precision beam pointing control scheme founded on multi-source information fusion. A detailed state-space model is constructed by integrating the coupled dynamics of moving optical sub-assemblies. Using error quaternions, the nonlinear measurement equations are linearized, thereby enhancing the accuracy of filter-based attitude determination via inertial sensor fusion. Furthermore, a time-varying analytical formulation of the point-ahead angle (PAA) is derived, supplying a theoretical basis for servo compensation. Closed-loop simulations of a three-spacecraft configuration validate the stability and accuracy of the proposed estimation algorithm. In combination with robust disturbance-rejection control, the method enables highly accurate beam pointing, providing essential technical support for GW detection missions.
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