摘要
随着焦平面探测器技术的发展,红外成像系统的性能评估和预测技术取得了很大进步,红外成像系统的现场性能预测模型也不断发展,成像系统性能预测考虑了欠采样、数字滤波、电子变焦及背景杂波等的影响,性能预测模型也逐渐完善,并在目标任务性能预测中起重要作用。正因为红外成像系统性能预测发挥的重要作用,干扰其正常工作的手段和设备越来越多,激光干扰是最常用且有效的一种干扰手段。以往研究激光干扰红外探测器主要集中在各种破坏效应上,并没有分析激光干扰对其性能预测的影响,因此有必要研究激光干扰对红外成像系统性能预测的影响。
为解决此问题,首先,本文在TTP准则的基础上,阐述了NVThermIP模型的现场性能预测思想,并将激光干扰考虑到性能预测模型中。其次,从干扰激光的能量角度考虑,对红外成像系统吸收的激光能量与对比度增强之间的关系进行建模,分析激光能量与对比度增强之间的关系,得到不同能量的激光干扰时系统的对比度阈值函数,结合NVThermIP性能预测模型可比较分析出激光干扰对系统性能预测能力的影响。最后,从辐照激光引起的干扰眩光角度考虑,分析眩光亮度对系统对比度阈值函数的影响,修正系统对比度阈值函数,进而比较分析不同亮度的眩光对红外成像系统性能预测能力的影响。
With the development of focal plane array technology, performance evaluation and prediction technology of infrared imaging system have made great progress, the models of field performance prediction of infrared imaging system have also been evolved. The effects of spatial under-sampling, digital filtering, electronic zoom and background clutter have been taken into performance prediction of the imaging system and the performance prediction models have been gradually improved, and they play an important role in target performance prediction. For this reason, more and more counter-measures and equipments are used to disturb the normal working of imaging system, laser interference is one of the most common and effective counter-measures, the research of laser jamming thermal imager was focused on a variety of laser destructive effects, the effects of laser interference on performance prediction were hardly analyzed. Therefore, the research of laser jamming infrared imaging system and its effects on performance prediction of infrared imaging system is needed.
To solve this problem, NVThermIP performance prediction model based upon the targeting tasks performance (TTP) criteria is described first, and laser interference has been taken into performance prediction in this paper. Further, considering from the laser energy's point of view, the relationship between laser energy absorbed by infrared imaging system and target contrast enhancement is modeled, and the quantitative relation between laser energy and contrast enhancement is analyzed, then contrast threshold function of the infrared imaging system is got at different energy of laser interference, the effects of laser interference on capability of performance prediction is compared and analyzed by NVThermIP model. Finally, considering from the glare's point of view, the effects of glare illumination on contrast threshold function are analyzed, and the expression of system contrast threshold function is modified, then the effects of different glare illumination on capability of performance prediction are compared and analyzed by NVThermIP model too.
引文
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