在单探测器型复合轴系统中, 子轴跟踪启动后, 主轴因没有适当的控制输入而处于开环状态, 易导致目标脱离视场。为了避免这种情况, 需要系统将精确的压电陶瓷(PZT)位置反馈给主轴。单独使用PZT振镜的开环系统时, 无法对PZT振镜的倾斜角度进行较高精度的控制, 若辅以检测补偿系统, 则可以提高系统的控制精度。目标位置检测对于振镜控制具有重要的作用, 它为开环状态下的伺服系统提供精确的控制信息, 以保证目标始终在视轴的中心位置。根据PZT振镜的物理结构特点, 研究单探测器型复合轴系统中振镜位置的检测方法, 给出电路的设计原理, 同时提出一种新的利用光学自准直仪的标定方法; 给出控制公式, 并重复进行多组实验, 以对控制公式进行验证。实验结果表明, 控制误差可以保证在20 μrad以内。该研究结果为单探测器型复合轴的控制系统设计提供了基础。

In a single detector compound axis system, the target will be out of field when the principal axis is in an open-loop state and the controlling for input is not proper after starting auxiliary axis tracking. In order to avoid this situation, it is necessary to feedback the accurate position of piezoelectric ceramics (PZT) to the principle axis. When the PZT mirror is used independently in an open-loop system, the tilt angle of the PZT mirror cannot be controlled precisely. However, the control accuracy of the system can be greatly improved combined with detection and compensation systems. The detection of target position plays a significant role for mirror controlling, which can provide precise control information for servo system in open-loop state, so that it can ensure the target stay at the center of the optical axis. According to the physical structure characteristics of PZT mirror, the position detecting method for mirror in the single detector compound axis system is studied. The principle of the circuit design is present, and a new calibration method with optical autocollimator is proposed. The control formulas are given, and several repeating experiments are accomplished to verify these control formulas. The results show that the error can be controlled within 20 μrad. The study provides foundation for the design of the control system of single detector compound axis.