Abstract
Guidance and control method was presented in this paper for flight vehicle with a strap-down seeker. Firstly, an extended Kalman filter was constructed in LOS (line of sight) coordinate system to estimate the guidance signal based on the information measured by strap-down seeker and inertial measurement unit. Secondly, an optimal guidance law which could reduce the target maneuvering and guidance system dynamics was proposed. Thirdly, three-loop acceleration autopilot with pseudo-angle of attack feedback was presented to control the flight vehicle. Finally, the proposed methods were simulated under typical condition. The simulation results demonstrated that the proposed methods were valid, and good performance could be achieved by the guidance and control method with the guidance signal estimated by the extended Kalman filter.
Highlights
The strap-down seeker removed the complex gimbals and electrometrical structures compared with the traditional gimbaled seeker
Based on the measurements of phased array radar seeker, the extended Kalman filter has been designed in the LOS coordinate system to estimate the maneuvering target acceleration, time-to-go, and angular rate of LOS
The practical optimal guidance law was derived in LOS coordinate system
Summary
The strap-down seeker removed the complex gimbals and electrometrical structures compared with the traditional gimbaled seeker. The size of the seeker could be much smaller and the response time could be much faster than gimbaled seeker. Because of these advantages, the strap-down seeker was a good new choice in the engineering [1][2]. The strap-down seeker needed to isolate the disturbance of the body with mathematics method[3]. The Kalman filter was usually been used to estimate the guidance signal[4]. In order to use optimal guidance law, the guidance information should be estimated above all. For the vehicle with estimated guidance signal, the acceleration command would be noisy. To make sure the control process was smooth and reliable, the autopilot with good performance should been chosen
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