基于跟踪微分器的滚仰式成像导引头视线角速率估计

Line-of-sight Rate Estimation Based on the Tracking Differentiator for Roll-pitch Imaging Seeker

针对滚仰式半捷联成像导引头难以直接获得精确的视线角速率这一问题,提出利用弹体姿态角速率、失调角、框架滚仰角等信息解算出惯性系下的视线角的方法。针对解算出的惯性系下的视线角,通过选择合适的跟踪微分器提取出惯性系下的视线角速率信息。仿真试验表明,选择合适的跟踪微分器能够在大背景噪声下对惯性系下解算出的视线角连续平滑地微分,进而可得到精确的视线角速率。

For roll-pitch semi-strapdown imaging seeker, it is difficult to obtain accurate line-of-sight rate directly. According to attitude angle rate of the missile, offset angle, and the angle of the roll-and-pitch platform, the angle of line-of-sight for roll-pitch imaging seeker can be calculated in the inertial space. Then, the angle rate of line-of-sight can be solved by selecting appropriate tracking differentiator. The simulation results show that the differentiated signals of the angle of line-of-sight can be smoothly solved by selecting appropriate tracking differentiator under strong background noise. Then, the angle rate of line-of-sight can be accurately obtained.