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为了验证时-空过采样系统对点目标探测的优越性,设计了红外点目标成像仿真及实验系统,研究并验证了时-空过采样获得的点目标图像形状、能量分布特点。首先,对比分析了时-空过采样系统与常规采样系统对点目标扫描成像原理;然后,对时-空过采样系统成像过程建立模型,通过仿真研究该系统对点目标的成像特点;最后,设计红外点目标成像实验并对实验数据进行分析。仿真及实验结果证明了时-空过采样克服了单采样对点目标成像能量分散的问题,图像信噪比至少提高2倍以上,且验证了经时-空过采样后,点目标像素之间具有特定的相关规律。利用时-空过采样的点目标成像特点,可为点目标的快速检出提供有利条件。
In order to verify the superiority of time-space oversampling system to point target detection, an infrared point target imaging simulation and experiment system is designed. The shape and energy distribution of point target images obtained by time-space oversampling are studied and verified. First of all, the principle of point-target scanning imaging between time-space oversampling system and conventional sampling system is comparatively analyzed. Then, the imaging process of time-space oversampling system is modeled and the imaging characteristics of point target are studied by simulation. Design infrared point target imaging experiment and analyze the experimental data. Simulations and experimental results show that time-space oversampling overcomes the problem of single target sampling energy disperse, and the signal-to-noise ratio of image is at least two times higher than that of single-target oversampling. Has a specific relevant law. The use of time-over-sampling point target imaging features, can provide a favorable condition for the rapid detection of point targets.