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.
Abstract. In this paper, the rotating bomb full strap-down seeker is taken as the research object. We focus on the extraction method of LOS rate of full strap-down seeker. The structure of the full strap-down seeker is completely different from that of the conventional platform seeker. Its measurement system is fixed together with the missile body. So the seeker can only get the measurement information under the missile coordinate system. And the measurement information is coupled with the missile posture information, can't be directly used for the control of the missile. According to the conversion relationship between the coordinate system, the mathematical model and decoupling model of LOS are established. In this way, the mathematical model of the LOS angle rate extraction is further established. At the same time, two kinds of Kalman filter methods, EKF and UKF, are used to design the Kalman filter to filter the extracted LOS containing noise information. The validity of the LOS rate extraction mathematical model is verified on MATLAB. And the mathematical simulation on MATLAB verify that the designed Kalman filter can effectively extract the line of sight rate information.
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