Error Propagation in the Ship's Inertial Navigator:Linear vs Non-Linear Theory,and the Effects of Ships Velocity and Earth's Oblateness.

摘要

The effects of the linearization approximation,neglect of ship's speed,and the spherical earth approximation on error propagation in the ship's inertial navigation system (SINS) is estimated. This is done by considering an inertial navigator that is perfect in all respects. It is,however,put into operation with incorrect initial conditions. The resulting errors are propagated for one hour using analytical procedures that contain either none,or one or more of the above simplifications. Comparisons of the results then provide estimates of the effects of each of these approximations on error propagation.