Characterized by its compact structure and fast response, the rotational double prisms system is broadly applicable for high-precision pointing and tracking. In particular, closed-loop tracking technology based on an image detector can overcome beam deflection errors caused by prism parameter and target-guiding errors. However, the rotations of each prism affect beam deflection angles in both the x- and y-directions by different amounts in different areas. Therefore, aimed at this problem of the tracking error being coupled to the rotation angle of the two prisms, we proposed a real-time sector selection closed-loop tracking method by inputting error value feedback from the detector and outputting the adjustment values of the prisms. This method can simultaneously close-loop the error signal in two directions and is not limited by the target distance. We established a test platform to verify the proposed method. The test results showed that the proposed method can continuously track moving targets across different areas of a field of view for an extended period. When the maximum moving speed of the target was 0.32 deg / s, the root mean square tracking error of the noncentral area was <1 arcsec. The simulated and experimental results confirmed the effectiveness of this method.

中文翻译：

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基于旋转双棱镜的运动目标高精度闭环跟踪

旋转双棱镜系统结构紧凑，响应速度快，广泛适用于高精度指向和跟踪。特别是基于图像探测器的闭环跟踪技术可以克服棱镜参数和目标引导误差引起的光束偏转误差。然而，每个棱镜的旋转在不同区域以不同的量影响 x 和 y 方向上的光束偏转角。因此，针对跟踪误差与两个棱镜的旋转角度耦合的问题，我们提出了一种实时扇区选择闭环跟踪方法，通过输入检测器反馈的误差值并输出棱镜的调整值。 . 该方法可以同时闭环两个方向的误差信号，不受目标距离的限制。我们建立了一个测试平台来验证所提出的方法。测试结果表明，所提出的方法可以在较长时间内连续跟踪视场不同区域的运动目标。当目标最大移动速度为0.32 deg/s时，非中心区域的均方根跟踪误差<1 arcsec。仿真和实验结果证实了该方法的有效性。非中心区域的均方根跟踪误差 <1 弧秒。仿真和实验结果证实了该方法的有效性。非中心区域的均方根跟踪误差 <1 弧秒。仿真和实验结果证实了该方法的有效性。