Abstract
Flight vehicle high-speed spin movement has caused difficulties in the application of the strap-down inertial navigation system due to gyroscope performance limits. One method for designing a low-cost untwisting spin platform used for high-speed spin flight vehicle is proposed. A permanent magnet synchronous motor (PMSM) is selected as the drive motor. The platform and PMSM rotor are directly connected to reduce the influence of the gear clearance on inertial measurement unit measurement accuracy. Signal transmission between the spin flight vehicle and micro-electro-mechanical system (MEMS) gyroscope is carried out by a slip ring. The PMSM is controlled by a speed loop and current loop without angle loop, which is able to achieve fast tracking of flight vehicle spin movement and reduce the MEMS gyroscope output noise influence on platform performance. The demand on gyroscope performance is also decreased. The design method is verified experimentally and results show that the method can not only effectively isolate the inertial measurement unit from the spin movement of the flight vehicle, but also decrease the attitude angle error.
