An Efficient System-Level Calibration Method for a High-Precision RLG RINS Considering the G-Sensitive Misalignment

The dither mechanism in a ring laser gyroscope (RLG) produces a lateral deformation when subjected to external acceleration, which is called the g-sensitive misalignment. This article considers the g-sensitive misalignment mechanism, examines the calibration coupling error and the navigation error resulting from it, and proposes a system-level calibration method based on the g-sensitive misalignment. The feasibility of the proposed calibration method is verified by the calibration simulations and experiments using a turntable. The results of a laboratory navigation test and an in-vehicle navigation experiment show that when the g-sensitive misalignment is considered and compensated in the calibration process, the navigation error can be significantly reduced. This article concludes that the g-sensitive misalignment of the RLG should not be disregarded. Finally, it is shown that using an efficient calibration method considering the g-sensitive misalignment can enhance the navigational performance of a high-precision RLG rotational inertial navigation system.