视线在惯性空间中运动所形成的角速度是导引头输出的重要的制导信息。从运动学的角度将视线在惯性空间的运动分解成视线相对导引头光轴的运动和光轴相对惯性空间的运动。基于刚体定点转动理论，分析了目标在导引头视场中运动时视线相对光轴运动所形成的角速度以及该角速度垂直于视线的分量，分别得到计算公式，最后通过数值仿真进行验证。结果表明：利用成像导引头提供的失调角信息能够精确解算出该角速度中垂直于视线的分量。

Angular velocity output by the seeker is the most important guidance information, which was caused by the movement of line-of-sight in the inertial space. From the aspect of kinematics, the movement of line-of-sight in the inertial space was decomposed into the movement of line-of-sight relative to the light axis of the seeker and the movement of the light axis in the inertial space. Based on the theory of rigid body turning around a fixed point, angular velocity and its component perpendicular to the line-of-sight were analyzed, which were caused by the movement of line-of-sight relative to the light axis when the target was moving in the field of sight of the seeker. And calculation formulas were obtained. It was test by numerical simulations. It is shown that component of the angular velocity perpendicular to the line-of-sight is able to be precisely resolved by the errors provided by the infrared imaging seeker.