气流扰动下光电系统高精度稳像控制方法

气流随机冲击引起的姿态扰动是飞行器光电系统的主要扰动源，在系统自身转轴摩擦和质量不平衡等因素的作用下，严重影响了光电系统视轴稳定性。为了有效抑制扰动力矩的影响，建立了外俯仰、内方位两轴光电系统动力学模型，给出了扰动因素和运动耦合综合作用下的扰动传递关系。根据系统动力学模型，提出了扩展卡尔曼滤波扰动力矩估计方法，并构建扰动力矩前馈控制回路，实现了对扰动力矩的实时补偿，大大提高了光电系统的稳像控制精度。利用飞行模拟转台对某两轴光电系统进行了半实物仿真实验，结果表明:在幅值为1、频率为2 Hz的载体扰动条件下，采用前馈补偿方法系统俯仰和方位框架的视轴稳定精度均方根值分别达到0.026 4 mrad和0.029 0 mrad，相比扰动观测器控制方法分别提高了64.1%和69.6%。

Control method of high accuracy video-stabilization with airstream disturbance for opto-electronic system

Attitude disturbance caused by the random impact of airstream is the main disturbance source of the aircraft opto-electronic system. At the effect of the axis friction and mass imbalance of the system, the line-of-sight(LOS) stabilization is affected seriously due to the disturbance. In order to effectively suppress the influence of disturbance moment, a two-axis opto-electronic system dynamic model with outer pitch and inner azimuth was established, and the disturbance transfer relationship which contained the disturbance factors and movement coupling was obtained. A disturbance torque estimated method with extended Kalman filter(EKF) based on the dynamics model was proposed, and the feed-forward control loop of disturbance torque was established, consequently the disturbance torque was compensated at the real time, the system LOS stabilization was improved substantially. A semi-physical simulation experiment using flght simulation test table was carried out. The experiment result shows that the RMS result of LOS stabilization accuacy is 0.026 4 mrad of pitch and 0.029 0 mrad of azimuth frame with feed-forward method, which improve 64.1% and 69.6% compared to disturbance observer (DOB) method.