Azimuth Observability Enhancement During Ins in-Flight Alignment

摘要

The questions whether an axial acceleration maneuver is superior to a lateral one during the in flight alignment (IFA) of an inertial navigation system (INS) and whether there exists a simple test or an expression which clearly indicates it are addressed. An axial maneuver is not superior to a lateral one in general. There are, however, three classes of alignment problems in which axial maneuver is superior. These cases are modeled by simple models which yield analytic expressions clearly indicating the superiority of the axial maneuver during IFA of an INS. These three classes of alignment problems encompass a large number of existing systems.