| Dynamic characteristics and vibration error of RLG are mainly studied in this paper, and the coupled dithering error of strapdowm inertial navigation system is elementarily analyzed. Finite element method is adopted to make a lot of emulational analysis of dynamic characteristics of RLG's dithering itself and that under the stimulating of outer vibration. A complete and reliable method for dynamic emulation of RLG and strapdowm inertial navigation system is fished out.Firstly, a detail analysis of RLG mode and boundary conditions which affect RLG mode is made and a dynamic mode for RLG is set up. Then, frequency response analysis of RLG under the conditions of stimulating from each direction and stimulating of piezoelectric ceramic are atudied, which provide a judgment criterion for swing design of RLG.Secondly, Transient response analysis of RLG and strapdowm inertial navigation system under working is realized and dynamic characteristics of any part can be obtained. Laster vibration meter and high frequency sampling of RLG output are used to test the dithering dynamic characteristics of RLG, which proves that the frequency analysis and transient response analysis is right.RLG's error characteristics in different vibration conditions are studied by adopting above method. Offset of RLG's sensitive axes under these conditions can be obtained. Lastly, it is studied that the impact coupled dithering error of RLG and different frequency combination of gyroscopes in strapdowm inertial navigation system have on the base and coning. The result is that the larger the difference of frequencies, the smaller the coning swing and the larger the distortion of base of strapdowm inertial navigation system.In the paper, a creative method is put forward to analyze the dynamic characteristics of RLG and strapdowm inertial navigation system, which provides a new way to study RLG's vibration error and strapdowm inertial navigation system's coupled dithering error.
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