针对游移算法因经线收敛引起的极区无法定位定向和格网算法因失去航向基准引起的赤道无法定位定向问题，提出了基于游移方位惯导机械编排的极区格网投影导航算法，推导了格网坐标系与游移坐标系之间的方向余弦矩阵，采用格网航向、格网速度、地心地固坐标作为极区导航参数，建立基于艾伦方差拟合法的惯性信息误差模型，解决了中低纬度和高纬度地区导航算法不统一的问题，实现了惯导全球范围内的定位定向功能。仿真表明提出的格网投影算法在极区48 h定位误差为6 nmile，格网算法为5 nmile，两种算法精度相当，均能满足极区导航的精度要求。

Wander algorithm cant determinethe position and azimuth in polar area because of the meridian convergence and grid algorithm cant determine the position and azimuth in the equator because of the loss of heading benchmark. To solve the above problem, the grid projection inertial navigation algorithm is presented based on wander mechanization. The direction cosine matrix between the wander coordinate system and grid coordinate system is deduced, which generates the polar navigation parameters including grid course, grid speed and ECEF coordinates. A inertial information error model based on Allan variance fitting is also established. In the way of this paper can inertial navigation system work around the world and have the same mechanization in high latitude area and low latitude area. Simulation shows that the proposed grid projection algorithms positioning error in polar is 6 miles/48 hours and that of grid algorithm is 5 miles/48 hours. Two kinds of algorithm have the same precision and both of them can satisfy the requirements of polar navigation.