舰载光电设备在捕获跟踪阶段, 由于艏摇、纵摇、横摇的扰动, 红外跟踪精度会受很大的影响。为了提高舰载光电设备跟踪精度, 提出了一种速度回路前馈控制策略, 控制方法分三步: 首先将大地坐标系转化为甲板坐标系;其次当目标出现在视场内且满足图像提取阈值时, 利用CA模型最小二乘法原理对合成的甲板坐标系下的速度进行滤波;最后将滤波后的速度前馈到速度回路上, 同时伺服控制回路采用串联校正, 根据不同的跟踪状态切换不同的调节器, 并结合红外脱靶量信息构成完整的双闭环回路。试验显示, 某舰载光电设备红外跟踪状态下, 在未加入本算法时, 跟踪误差的最大值为120″, 加入前馈补偿后, 跟踪误差的最大值为78″, 减小了跟踪误差, 提高了舰载光电设备对抗能力。

The infrared tracking accuracy of shipboard photoelectric tracking device may be greatly affected in the capture stage by the bow wave, pitch and roll disturbance. In order to improve the tracking accuracy, the paper presents a speed loop feedforward control strategy, which can be divided into three steps. First, transform the geodetic coordinate system into the coordinate system of deck. Secondly, use CA model least square method to filter the speed when the target appears in the image field of view and satisfies the extraction threshold value. And finally, feed the filtered speed forward to the speed loop. Series correction is used in the servo control loop, and different regulators are selected according to the tracking status. A complete double-loop circuit is formed combined with infrared miss distance information. Experiment to infrared tracking performance of an shipboard photoelectric device showed that: the maximum tracking error is respectively 120″ and 78″ before and after using the feed-forward compensation. Thus the algorithm can reduce the tracking error and improve shipboard optoelectronic countermeasure ability.