Working Performance Analysis on Polar Navigation of Semi-analytical Inertial Navigation System

Abstract

Aiming at the problem that meridian convergence in high latitude area leads to the failure of navigation algorithm with true north direction as heading reference, combined with the performance analysis of the traditional mechanical arrangement method in polar region of semi-analytical inertial navigation system, taking the problem that azimuth axis gyrotorquing under the inertial navigation system with local horizontal north pointing mechanical arrangement method is difficult to work in polar region as an example, the special mechanical arrangement method of inertial navigation system with azimuth axis gyrotorquing, i.e. wandering azimuth inertial navigation system, is introduced in detail. Through the analysis of their working principles and the verification of simulation experiments, the polar navigation algorithm based on grid navigation mechanical arrangement is proposed, the polar navigation scheme of the inertial navigation system with abscissa system is established, and the conversion relation of each navigation parameter in the inertial navigation system between the abscissa system and the traditional coordinate system is derived. By introducing the transverse earth coordinate system instead of the traditional earth coordinate system, the problem of the semi-analytical inertial navigation system mechanical arrangement method when working in polar region is solved.