中文摘要：

针对全捷联导引头只能测得相对于弹体的视线角而不能测得制导系统需要的视线角速率信息的问题。提出了一种基于中央差分卡尔曼滤波（CDKF）的视线角速率估计方法。上述方法充分利用了惯导系统角速率陀螺的信息，简化了系统噪声模型。通过研究相关坐标系的转换关系，引入解耦矩阵，建立了视线角速率估计模型。避免了引入不可测的相对距离和相对速度信息，以某航空制导炸弹为例进行了视线角速率估计，蒙特卡洛仿真结果表明，上述方法能够有效的提取视线角速率，与传统的EKF方法相比能够提供更精确的估计值，为全捷联导引头视线角速率估计提供了一种新的方法。

英文摘要：

The strapdown seeker can obtain the line of sight （LOS） angular that is relative to body coordinate, but cannot obtain the LOS angular rate needed for guidance system. Aiming at this problem, a LOS angular estimation method based on Central Difference Kalman Filte （CDKF） is proposed. This method makes full use of the rate gyro output of the inertial navigation system, and the system noise model is simplified. After studying the relationship of the concerned coordinates, the LOS rate estimation model is established by introducing a decoupling matrix. This model avoids the introduction of the unmeasured relative distance and its rate. The Monte-Carlo simulation results show that this method can extract a satisfactory LOS rate information by applying it on a certain type of guided bomb. Compared with traditional method, such as EKF, the estimation method can extract more accurate estimate value. It provides a new method to estimate LOS rate for strapdown seeker.