Dithering system model identification of ring laser gyroscopes

A filtering based dither-stripping technique for ring laser gyroscopes (RLGs) requires a more reasonable mathematical model of dithering system which is used for the design of model based adaptive filters to estimate the dither signal more robustly and accurately. To this end, this paper presents dithering system model identification results. Considering measurement errors and model uncertainties, two auto-regressive exogenous (ARX) models are used to identify both dither and angular velocity sensor include in dithering system and the parameters of each ARX model are estimated using least squares estimation method. The identified model is validated via several experiments. The validation results show that the identified model is reasonable in a wide range of operation such that they can be used to design model based adaptive filters for filtering-based dither-stripping of dithered RLGs.