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提出一种应用于天线跟踪稳定平台的捷联惯导转动基座初始对准方法。首先对卫星天线跟踪稳定平台的结构进行分析,得出在不改变系统现有硬件结构条件下,可充分利用天线跟踪稳定平台的结构特点进行转动基座初始对准的结论;建立完整的捷联惯导旋转基座初始对准数学模型,并采用奇异值分解法分析捷联惯导转动基座初始对准的可观测性。实验结果表明,该方法初始对准中系统可观测矩阵的最小奇异值比静基座初始对准可观测矩阵最小奇异值大一个多数量级,能提高捷联惯导系统的可观测性,并能有效地提高姿态角尤其是航向角的对准精度,为提高通信卫星天线跟踪稳定平台的性能提供了有价值的参考。
An initial alignment method of SINS rotating base applied to the antenna tracking and stabilizing platform is proposed. Firstly, the structure of satellite antenna tracking and stabilizing platform is analyzed, and the conclusion that initial alignment of rotating base can be made full use of the structural characteristics of antenna tracking and stabilizing platform without changing the existing hardware structure of the system is achieved. A complete strapdown The initial alignment mathematical model of the rotating base of inertial navigation and the singular value decomposition method were used to analyze the observability of the initial alignment of the rotating base of SINS. Experimental results show that the minimum singular value of the system observable matrix in the initial alignment of the method is more than one order of magnitude larger than the minimum singular value of the observable matrix of the initial alignment of the static base, which can improve the observability of the SINS Which effectively improves the alignment accuracy of the attitude angle, especially the heading angle, and provides a valuable reference for improving the performance of the communications satellite antenna tracking and stabilizing platform.