Volume 38, Number 3, June 2020
|Page(s)||604 - 609|
|Published online||06 August 2020|
Estimation of Full Strap-down Rotating Bomb Guidance Information Based on Unscented Kalman Filter
System Engineering Institute of Sichuan Aerospace, Chengdu 610100, China
2 The Third Academy of China Aerospace Science&Industry Corporation, Beijing 100074, China
In this paper, the full strap-down seeker of rotating bomb is taken as the research object, and the method of extracting the LOS (line-of-sight) angle and angular rate of the full strap-down seeker of the rotating bomb is studied. The structure of the full strap-down seeker is quite different from that of the conventional rate gyro seeker. The measurement system of full strap-down seeker is fixed to the missile, the seeker can only obtain the measurement information in the projectile coordinate system, and the measurement information is coupled with the body posture information, so it cannot be directly used for the control guidance of the rotating projectile. First, based on the conversion relationship between coordinate systems, the mathematical model of the inertial LOS angle of the rotating bomb is established, and the mathematical model of the extraction of the inertial LOS angle and angular rate of the rotating bomb is further established. Then, the Kalman filter is designed by using the unscented Kalman filter method (UKF), and the extracted LOS angle containing noise information is filtered. Finally, the mathematical simulation is carried out to verify the validity of the mathematical model of LOS angle and angular rate extraction. Compared with the Extended Kalman filter method (EKF), the UKF has a higher accuracy for estimating the navigation information of the full strap-down rotating projectile.
Key words: rotating bomb / full strap-down seeker / inertial LOS angle / Kalman filter / simulation
关键字 : 旋转弹 / 全捷联导引头 / 惯性视线角 / 卡尔曼滤波 /
© 2019 Journal of Northwestern Polytechnical University. All rights reserved.
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