灵巧子弹捷联成像导引头视线转率估计方法

LOS Rate Estimation Method for Strap-down Imaging Seeker of Smart Submunition

视线转率是灵巧子弹实现脉冲比例导引必须获得的重要信息.为估计捷联成像导引头视线转率,通过联立角速度合成方程和视线坐标系下导引头运动方程,构造了耦合的状态方程.对无法直接测得的弹目距离和接近速度进行合理近似,结合自适应滤波算法实现了在只有弹体系测量信息情况下对视线转率的估计,与传统方法相比不需要测量弹体姿态.仿真结果表明该方法可以在简控体制下有效获得视线转率并能够产生正确的制导信号.

The smart submunition guided by pulsed proportional navigation requires the measurement of line-of-sight （LOS） rate. Estimation of LOS rate is the main purpose. The coupled state equations are proposed by uniting the angular velocity equations and the LOS motion model. By approximation of the unmeasured relative distance and its rate, a reasonable approach is applied. Based on the model mentioned above, the LOS rate can be estimated by applying the adaptive filter under the situation of measuring information in the body frame. In comparison with the conventional method, the body attitude measurement is unnecessary. The result of computer simulation indicates that in the simply control condition, the method can estimate LOS rate accurately and produce guidance signals properly.