Abstract:In order to solve the linear drift problem of the three-axis rate gyro platform during the three-direction dynamic swing in the air, a biaxial coupling method was proposed. A method to optimize the control structure of the stabilized platform is proposed. The dynamic drift of a three-axis platform on a three–degree-of-freedom swinging turntable is established first. The angular motion output model of the three-degree-of-freedom turntable is obtained according to the transfer characteristics of the angular motion model on the platform base. Second, compare the rate gyro platform and bit, the differences and similarities of the gyro platform in the stable loop control structure are analyzed, and the errors of the frame angle and the large drift rate of the platform body caused by the biaxial coupling dynamic swing are obtained. Based on the error source, the stability loop control structure of the rate gyro platform is optimized. Finally, the simulation is carried out and the three degrees of freedom rotary table swing test that the swing process no longer appears the frame angle of the large linear drift, verifying the stability loop structure optimization is correct.