一种基于凝固地理系的捷联惯导极区导航算法

针对传统惯性导航系统机械编排在极区导航存在无法定位定向问题，提出了一种基于凝固地理系的捷联惯导极区导航新方案。该方案在极区内采用相对于原点三轴位置代替传统的经度、纬度、高度导航，导航计算不存在奇点。给出了凝固地理系捷联惯导系统的机械编排，推导了该坐标系与地理坐标系之间位置、速度和姿态信息的转换关系。仿真分析表明：凝固地理系可以解决现有机械编排在极点附近无北向基准所引起的问题，导航参数连续并且无原理性误差，可以满足飞机在极区飞行时的需要。

A polar navigation algorithm of strapdown inertial navigation system under frozen geography frame

Aiming at the problem that the classical mechanizations of inertial navigation system in polar region are unable to confirm its position and heading, a new polar navigation scheme based on frozen geography frame was proposed, which is suitable for strapdown inertial navigation system. This scheme uses three axis position instead of longitude, latitude and altitude for navigation in polar region. This algorithm has no singularity in navigation calculation. The mechanizations under the frozen geography frame were given. The parameter transformations from a frozen geography frame to geography frame for position, velocity and attitude were deduced. The simulation and analysis results show that this method can solve the problem that the north benchmark is invalid, and that the navigation parameters are continuous and have no theoretical errors. The mechanizations under the frozen geography frame can meet the requirement of transpolar aircraft.