Polar region inertial navigation method based on horizontal geographic coordinate system

The invention discloses a polar region inertial navigation method based on a horizontal geographic coordinate system. The method includes the following steps of building a horizontal earth coordinate system and the horizontal geographic coordinate system, taking the horizontal geographic coordinate system as a navigation coordinate system of a strapdown inertial navigation system and carrying out mechanical arrangement, and providing a conversion relation between two navigation parameters of a geographic coordinate system and the horizontal geographic coordinate system so as to achieve smooth transition of a navigation mode of a carrier when the carrier operates from a non-polar region to a polar region. By means of a strapdown inertial navigation arrangement mode in the horizontal geographic coordinate system, the problem that a strapdown algorithm based on the geographic coordinate system fails due to meridian convergence in the polar region is solved.