具有高分辨率和大视场的导引头设计方法

Investigation of Infrared Staring Imaging Seeker with High Resolution and Large Visual Field

针对现有的红外均匀成像导引技术无法有效地处理高分辨率、大视场和实时性三者之间的矛盾,提出了一套基于空间变分辨率理论的导引头成像方案。通过使用了对数极坐标变换描述的空间变分辨率模型,将视场分为高分辨率区和低分辨率区,从而克服了三者的矛盾,并使系统具有尺度和旋转不变性。此外,为了加快目标匹配速度,提出了一种快速双投影匹配方案。通过对尺度和旋转变化后的目标进行匹配和分析,可以证明对于n×n大小的图像,新方法的运算量仅仅是原方法的2/n。

The uniform infrared imaging seeker in existing can＇t solve the contradiction between high resolution, large visual field and real time processing. To solve this problem, a space-variant imaging system was put forward. By using Log-Polar model, the visual field could be divided into high resolution region and low resolution region. So the contradiction between large visual field and little computation cost was solved and the invaliant of rotation and scaling was achieved. Furthermore, a fast twin-projection matching method was proposed to increase the speed of matching. Then the simulation and analysiswere made to dispose of a rotated and scaled image. This analysis indicates that the new matching method can make computation cost reduced significantly as the accuracy is un-injured. The computation cost of new method is only 2/n of that for original method, as an image with size of n × n is processed.