Roll angle measurement method of trajectory correction fuze based on fading UKF

Abstract

In view of the problems existing in the roll angle measurement technology of trajectory correction fuze at presen: Satellite measurement is easy to interfere, traditional inertial measurement method based on gyroscope has insufftcient range, and geomagnetic measurement method is easy to be affected by wing, a method for measuring the rolling angle of projectile by using multiple accelerometers is proposed. Based on the three-axis accelerometer, two accelerometers installed parallel to but not coincident with the axis of the projectile are added to measure the Coriolis acceleration, which is used as the measured value to estimate the roll angle by fading unscented Kalman filter. Based on 122mm shrapnel trajectory modeling and simulation, the results show that the absolute error of roll angle measurement is less than three degrees, which can meet the guidance requirements of two-dimensional trajectory correction module.