基于线性协方差分析的接近天体在轨导航方法研究

On Autonomous Navigation Based on Linear Covariance Analysis for the Approach Phase of Interplanetary Mission

针对深空探测接近段自主导航高精度、高可靠性和实时性的要求,提出在轨融合光学测量信息和无线电测量信息的接近段自主导航方法.为选择合适的光学测量信息和无线电信息在轨融合,结合线性协方差分析方法和基于B平面参数的误差分析方法,分析了不同光学观测信息和无线电测量信息在轨融合的导航方案,说明了提出的自主导航方法可有效提高导航精度,并对光学观测信息的选择给出了合理的建议.基于蒙特卡罗打靶的仿真分析验证了所提出分析方法的有效性.

Upon the demands of high accuracy,high reliability and real time for interplanetary navigation system,an autonomous navigation method for the approach phase is proposed,which relies on the on-orbit fusion of optical and radio measurements.To choose appropriate optical measurements and radio measurements for on-orbit fusion,the paper,using a linear covariance analysis and an error analysis method based on B-plane parameters,analyzes various autonomous navigation schemes fusing different optical and radio measurements.The result shows that the proposed autonomous navigation method can effectively improve the navigation accuracy.We also give some principles for reasonable selection of optical measurements.Finally,the presented analysis method is verified by the Monte Carlo target practice based simulation.