Abstract:

In order to improve the accuracy of auto-compensation for a rotation-modulated strapdown inertial navigation system (RMSINS), some effective techniques to compensate the harmful error effects of a ring laser strapdown inertial navigation system are discussed. And then a new synchronous double-axis modulation method with periodic reversal is proposed, which resolves the limitation of the two-axis indexing scheme. At first the two gimbals angular rates are decided through analyzing in theory. Then the depression of error terms including the constant drift error and the harmful error effects are analyzed in detail, based on which, the best rotation scheme is designed through analyzing in theory and testing in simulation. In the method, the RMSINS’s constant drift error and the harmful error effects can be compensated at the same time. The simulation results show the effectiveness which lays a sound foundation for actual application of RMSINS.