捷联导引头相对于框架式导引头而言，拥有许多优势。捷联导引头技术越来越受到各国军方的重视。捷联导引头无法直接测量弹目视线角速率，实现捷联导引头的工程运用首先需要解决弹目视线角速率的提取问题。弹目视线角速率提取的方法主要有两类，第一类是利用微分网络对弹目视线角进行微分来获取弹目视线角速率，第二类是利用卡尔曼滤波器对弹目视线角进行估计。建立了基于这两类方法的模型，并进行了仿真，仿真结果表明：第二类方法比第一类更具有优势。由卡尔曼滤波器估计出的惯性系弹目视线角速率比运用微分网络得到的惯性弹目视线角速率具有更小的延迟; 在相同的量测噪声水平下，第二种方案输出的惯性系弹目视线角速率信号噪声水平更低。

With obvious advantages comparing to gimbaled seekers, strap-down seekers attract more and more attention from military of different countries. Since strap-down seeker can not measure the line-of-sight (LOS) angular rate directly, the problem of LOS angular rate extraction is solved firstly, which generally has two methods. One method is to get the LOS angular rate by solving the differential of LOS angle versus time, the other is to estimate the LOS angular rate by Kalman filter. The models of these two methods was built and simulations of them were made respectively. The simulation result shows that, the second method is better than the first one. The time delay of LOS angular rate estimated by Kalman filter is relatively shorter than that obtained through differential network. With the measurement noises at the same level, the output LOS angular rate noise of the second method is smaller than the first one.