Influence of Lateral-torsional Coupling Vibration on SINS Lever-arm Error Compensation

Abstract

Abstract. The influence of complex dynamic environment in apparatus cabin for strapdown inertial navigation system(SINS) is one of the technical problems to improve navigation accuracy. The SINS was equivalent to Timoshenko-beam hybrid system, which was considered under the lateraltorsional coupling vibration. The system motion was described by dynamic differential equations, decoupled and solved by the Timoshenko-beam's Green function. The vibration response of the SINS would make the lever arm vector changed and incomplete compensation, at the same time, vibration response also introduced measurement error. Finally, with the flight simulation, the influence of lever arm error incomplete compensation and measurement error were analysed separately.