一种无源干扰试验中烟幕遮蔽面积的测量计算方法

A Method for Measuring and Calculating the Obscuration Area of Smoke Screen in Passive Interference Test

在烟幕无源干扰试验中,烟幕对红外辐射源的有效遮蔽面积是评估和鉴定成烟装备综合性能的重要指标,由于烟幕的流动扩散性特点,其遮蔽面积的计算方法和标准已成为业界研究的难点和热点。通过对烟幕遮蔽面积和红外辐射点源衰减率的测量原理分析,推导出利用红外辐射点源的衰减率插值得到焦平面内衰减率空间分布的函数关系,列出了具体方法步骤,用红外辐射图像的插值效果进行了验证,当采样间隔大于20倍像元间距时无法恢复红外烟幕轮廓,并根据插值效果推导了红外辐射点源阵列布设的最大有效距离。该方法可作为光电外场试验中红外辐射点源阵列布设的参考,具有较高的实用价值。

In the passive interference test of smoke screen,the effective obscuration area of smoke screen to infrared radiation source is an important index to evaluate and identify the comprehensive performance of smoke-forming equipment.Due to the flow diffusivity characteristics of smoke screen,the calculation method and standard of the obscuration area have become a difficult and hot spot in the industry.In this paper,we analysize the measurement principle of smoke screen obscuration area and the attenuation rate of the infrared radiation point source.Then the functional relationship is derived,which is the spatial distribution of attenuation rate in the focal plane by interpolating the attenuation rate of infrared radiant point source.The specific method steps are listed,and the interpolation effect of infrared radiation image is verified.The infrared smoke screen contour cannot be restored by interpolating,when the sampling interval is greater than 20 times the pixel spacing.According to the interpolation effect,the maximum effective distance of infrared radiant source array layout is derived.This method can be used as a reference for the layout of infrared radiation point source array in photoelectric field test.