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Atmospheric turbulence effects on 3rd generation FLIR performance

机译：大气湍流对第三代FLIR性能的影响

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Previous analysis of ground-to-ground 3rd Generation FLIR performance (Driggers, et al) showed two main performance characteristics of the 3rd Gen sensor's MWIR and LWIR bands: first, that no major differences in detection range were observed between the two bands, and second, that a significant ID range advantage for the MWIR band over the LWIR band resulted from the smaller diffraction spot of the shorter wavelength MWIR. That analysis predicted performance for a variety of atmospheric transmittances but only at a single, relatively low value of atmospheric turbulence. In this paper, analysis of the effect of varying turbulence shows that increased turbulence decreases the ID range performance of the MWIR relative to the LWIR, and that at high turbulence values the two bands have roughly equivalent performance. Further, the LWIR band actually surpasses the ID range performance of MWIR at high turbulence for some systems. Frequency of occurrence data collected in multiple environments shows a predominance of moderate to high turbulence conditions in the real world. The superior ID range performance of the MWIR is thus achievable only under limited real-world conditions, and the LWIR can surpass the performance of the MWIR in significant scenarios (desert, day). For maximum performance under a variety of conditions the dual band capability of 3rd Gen FLIR systems is thus required.
机译：先前对地面第三代FLIR性能的分析（Driggers等）显示了第三代传感器的MWIR和LWIR频段的两个主要性能特征：首先，两个频段之间没有发现检测范围的主要差异，并且其次，由于波长较短的MWIR的衍射点较小，因此MWIR波段在LWIR波段上具有明显的ID范围优势。该分析预测了各种大气透射率的性能，但仅在单个相对较低的大气湍流值下才有表现。在本文中，对变化的湍流的影响进行分析表明，相对于LWIR，增大的湍流会降低MWIR的ID范围性能，并且在高湍流值下，两个频段的性能大致相当。此外，对于某些系统，LWIR频段在高湍流条件下实际上超过了MWIR的ID范围性能。在多个环境中收集的发生数据的频率显示，在现实世界中，存在着中等至高湍流条件。因此，仅在有限的实际条件下才能实现MWIR的出色ID范围性能，并且LWIR在重要场景（沙漠，白天）下可以超过MWIR的性能。为了在各种条件下实现最佳性能，因此需要第三代FLIR系统的双频段功能。

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