针对单输出非线性系统,基于现有能观性理论并利用条件数给出了能观性指数的定义,以此来衡量系统的能观度。将该能观度分析方法用于圆型限制性三体系统,按参考轨迹给出了航天器各位置分量对系统状态的能观度,相关结果以及分析方法本身可为复杂环境下航天器导航系统观测变量的选择提供参考。
For single-output nonlinear systems,a definition of observability index is given by using condition number,which is used to measure the degree of observability.The Restricted Three-Body system is then studied,the observability degree based on the observation of each element of position variable is given along a reference trajectory,corresponding results and the analysis method itself can help select observables for navigation of spacecraft in complex environments.