Research on Extraction Method of LOS rate of Rotating Bomb Full strap-down seeker Based on Kalman Filter

Abstract

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.