光电跟踪系统纯角度滤波器的设计

为了在不增加硬件的条件下改善光电跟踪系统的性能, 提出了仅基于目标角度信息的状态估计方法, 设计了纯角度跟踪滤波器。首先, 分析了带有激光测距仪的红外跟踪系统的工作机理; 针对目标机动性特点, 建立了球坐标系下目标的“当前”机动模型。然后, 针对纯角度跟踪过程中高频图像序列存在复杂噪声干扰的问题, 采用集员估计的方法对目标状态模型进行了补偿和调整, 并在此基础上设计了自适应椭球滤波算法。最后, 以舰载光电跟踪系统对来袭目标的跟踪为例进行了仿真。对比实验结果表明, 对于复杂噪声条件下的强机动目标, 在激光测距仪回波率为50%的情况下, 利用基于自适应椭球滤波算法的纯角度滤波器进行辅助跟踪, 可以实现方位(俯仰)角度估计均方差≤06 mrad的稳定跟踪, 效果显著优于传统滤波方法, 具有良好的工程实用价值。

Abstract

To improve the precision of an opto-electronic tracking system without installing new equipment, an assistant tracking with surplus angle information was carried out and a filter tracking only by angle information was designed. Firstly, the working principle of the opto-electronic tracking system with a laser-infrared detector was introduced, and a target model based on the “current” statistical model was established in a globe-coordinate. Considering the complex noise interference in the high frequency image series in a angle track process, the set-membership estimation was introduced to repair the maneuvering model, then a self-adjusted ellipsoidal bounding filter whose tracking was only by angle was designed. Finally, a simulation on the course tracking to enemy targets was performed by the opto-electronic system on the ship. The comparison results show when the laser detector probability decreases to fifty percent, the filter designed by ellipsoidal bounding algorithm could track the maneuvering target stably with a Room Mean Square Error(RMSE) of target angle less than 06 mrad.The filter could overcome the effect of non-white noises and has some practical values in engineering.

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郭宁, 吕俊伟, 邓江生. 光电跟踪系统纯角度滤波器的设计[J]. 光学精密工程, 2013, 21(7): 1818. GUO Ning, LV Jun-wei, DENG Jiang-sheng. Design of filter only by angle information in opto-electronic tracking system[J]. Optics and Precision Engineering, 2013, 21(7): 1818.

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