Study of extracting guidance information from a phased array seeker with antenna errors

To address the issue of guidance information extraction for strapdown phased array seekers with radome errors， a guidance information extraction method based on Kalman filtering is investigated. Firstly， a relative motion model is established in the body line-of-sight coordinate system， incorporating the radome error slope into the model， regarding the maneuvering targets， then the Singer maneuver model is employed， the radome error slope measured offline is treated as a known quantity， and observability analysis is implemented for the system of angle measurement observations undertaken， providing a theoretical basis for guidance information extraction in the presence of radome errors. Next， according to the isolation rising caused by gyroscope and beam control delays， a gyroscope delay compensation method is adopted to reduce the impact of airframe attitude disturbances. Finally， comparative simulations on isolation with and without gyroscope delay compensation for gyroscope and beam control delays are performed along with simulation validation in a high-altitude interception scenario against maneuvering targets. The simulation results demonstrate that the missile's isolation performance is improved after radome error compensation and a smaller miss distance is achieved in high-altitude interception of maneuvering targets.