基于多圆迭代和H∞ 滤波的捷联/天文定位算法研究

针对现有天文定位算法的缺点,提出一种多圆交汇迭代天文定位算法.该算法能够充分利用可观测恒星,同时能计算出定位误差协方差阵.针对提出的算法定位误差非线性的特点,提出了基于H∞滤波器的捷联/天文自适应组合导航算法,根据定位误差协方差阵实现量测自适应.仿真结果表明,天文定位算法模型准确,组合导航算法定位精度小于20m,定位误差稳定.

Research on SINS/CNS integrated navigation algorithm based on multi-circles intersection celestial positioning algorithm and H∞ filter

Based on the analysis of celestial positioning algorithm, a multi-circles intersection celestial positioning
algorithm is developed. The algorithm can make full use of navigation stars and produce position error covariance matrix
simultaneously. According to the nonlinear characteristics of the position error, a self-adaptive SINS/CNS intergrated
navigation system using H∞ filter is designed, which can adapt to the measurement using position error covariance matrix.
The simulation results show that celestial positioning model is accurate, and the SINS/CNS integrated system has high
precision and steady position error.