Line-of-Sight Angle Rate Reconstruction for Strap-down Seeker
Ge Zhi · Jisuanji fangzhen · 2009
Strap-down seeker's detecting information is coupled with missile attitude information,hence it can't be used for proportional navigation directly.The methods of reconstructing inertial line-of-sight(LOS) rate in strap-down seeker are investigated which only use output information of strap-down seeker and rate gyros.Forth-order Runge-Kutta is proposed to construct discrete model to reduce truncation error and avoid iterative divergence.Large instantaneous field of view will cause great background noise and any inaccurate metrical information used by the reconstructing system would be reflected to the final LOS,thus,filter is required.After separating the parameter and system state from the model,Joint Unscented Kalman Filter(Joint UKF) and Dual Unscented Kalman Filter(Dual UKF) are applied for LOS reconstruction filter coupled with simplified system noise.Both filters are less sensitive than general UKF to noise demarcating.The results of simulation validate the rationality and efficiency of the methods used in this paper.