针对传统惯导无法在极区提供高精度导航信息的问题,提出依据格林尼治子午线的平行线建立虚拟北(文中称为格网北),进而在格网北的基础上建立虚拟直角正交坐标系(文中称为格网坐标系),将其作为极区惯导的空间坐标基准,以解决极区导航参数解算中面临的坐标基准的数学理论问题。为了验证格网坐标系的有效性,建立了误差模型,仿真结果表明:采用文中建立的格网坐标系作为空间坐标基准,能够解算出高精度的导航信息。

In view of the problem that the traditional inertial navigation system could not provide navigation information with high accuracy in polar region, the virtual North (called grid north in this paper) was proposed based on the parallel line of Greenwich meridian, and then the virtual orthogonal coordinate system based on grid north (called grid coordinate system in this paper) was established, which was taken as the spatial coordinate reference of inertial navigation in polar region to solve the mathematical theory problem of coordinate datum in the process of polar navigation parameter calculation. In order to verify the validity of the grid coordinate system, the error model was established. The simulation results showed that the established grid coordinate system was taken as spatial coordinate reference, which could solve the high-precision navigation information.