基于地球坐标系的全球惯性导航与组合导航方法

包含高纬度极区的全球导航是现代民用和远程军用飞机对导航系统的重要要求。极区地理环境的特殊性导致常规的指北方位惯导算法在极区不适用。针对全球导航中极区与非极区惯导算法不统一的问题，提出了以基于地球坐标系的惯导机械编排为内核，导航参数在地理坐标系和格网坐标系输出的全球导航方法。针对长航时惯导系统存在的误差累积问题，设计了基于地球坐标系的惯性/卫星紧组合导航滤波器。仿真实验表明，基于地球坐标系的惯导算法在极区与非极区的算法性能分别与格网算法和指北算法一致，惯性/卫星紧组合导航有效提升了导航精度。

Global Inertial Navigation and Integrated Navigation Method Based on Earth Coordinate Frame

Global navigation containing high latitude polar regions is an important requirement for navigation systems in modern civil and long-range military aircraft.The peculiarities of the geographical environment in polar regions lead to the fact that conventional inertial guidance algorithms for pointing north are not applicable in polar regions.In order to solve the problem of non-uniform inertial guidance algorithms for polar and non-polar regions in global navigation,a global navigation method with the kernel of inertial guidance mechanical orchestration based on the earth coordinate frame and the output of navigation parameters in the geographic and grid coordinate frames is proposed.The inertial/satellite tightly integrated navigation filter based on the earth coordinate frame is designed for the error accumulation problem of the long-travel time inertial guidance system.Simulation results show that the performance of the inertial guidance algorithm based on the earth coordinate frame in polar and non-polar regions is consistent with the grid algorithm and the pointing north algorithm,respectively,and the inertial/satellite tightly integrated navigation effectively improves the navigation accuracy.