捷联成像寻的器视线重构

分析和比较了捷联成像寻的器提取视线角及视线转率的实现途径，通过充分利用寻的器和惯导系统提供的角速率信息，推导了惯性视线角的一阶动态方程，并结合Unscented卡尔曼滤波（UKF）理论给出了视线重构滤波器设计方法。与传统的视线和视线转率滤波方法相比，本丈所给出的方法无需应用成像寻的器无法观测的弹目距离和接近速度信息，也无需对未知目标机动进行建模，从而更方便于应用。仿真的结果验证了该方法可有效地重构视线角，从而进一步提高视线转率的估计精度。

Line-of-sight reconstruction for strap-down imaging seeker

The methods of Line-Of-Sight (LOS) and LOS rate reconstruction in strap-down imaging seeker system are investigated. A LOS reconstruction filter for strap-down seeker is proposed. An exact LOS dynamic model of strap-down seeker is constructed by applying fully the output information of rate gyro and the strap-down seeker. Compared with conventional LOS dynamic models, the relative distance and its rate between the missile and its target, which are unobservable to imaging seekers, together with the unknown maneuver models of the target are unnecessary. As a result, the model is convenient to use. Based on the proposed model, the reconstruction filter is designed, where the theory of Unscented Transformation (UT) and Unscented Kalman Filter (UKF) is applied to treat the nonlinearity. The results of computer simulations justify the validity of the LOS reconstruction filter, which can be used to improve the accuracy of LOS rate estimation.