RESEARCH ON THE INERTIAL MEASURING METHOD FOR HYPERSONIC VEHICLE BASE ON GFIMU

In order to adapt to the high dynamic, high maneuver and large acceleration characteristic of hypersonic vehicle, the gyro-free inertial measurement unit(GFIMU) which use accelerometers instead of gyroscopes to measure the angular velocity of hypersonic vehicle is proposed in this paper. For this program, a twelve-accelerometer configuration scheme is designed and the derivation of linear acceleration, angular acceleration, and angular velocity states from the GFIMU is reported firstly; Then a aided star-sensor based angular velocity calculation approach combining with kalman filter is presented which can effectively avoid the sign ambiguity problem of angular velocity and enhance the accuracy of angular velocity; Lastly, the simulation is carried out and the results show that it can avoid the sign ambiguity problem and has the advantage of even higher acceleration and angular rate solution accuracy, the GFIMU for hypersonic vehicle is available.