凹凸形周期结构遮障面的雷达及红外隐身性能分析

为了提高遮障面的雷达及红外隐身效果,采用外形隐身技术,设计了一种具有凸起和凹陷的周期结构遮障面。首先建立4种不同形状的模型,进行电磁仿真计算并与实验测量结果进行对比,结果显示仿真与实验数据相关系数在09以上,仿真结果准确可用。其次分析各模型的电磁散射机理,为遮障面外形设计提供理论基础。然后设计具有起伏特征的遮障面,经过仿真计算,发现凸起和凹陷程度半径r达到24mm时,遮障面反射系数小于-10dB,r达到28mm时反射系数小于-17dB。最后,在遮障面的凸起部分填充隔热材料,仿真其覆盖在运行温度为80℃的装(设)备上,发现具有隔热材料的遮障面温度降低35℃,具有一定的红外伪装效果。

Stealthy performance analysis of radar and infrared shieldingsurfaces with concave and convex periodic structures

In order to improve the radar and infrared stealth effect of the shielding surface,a periodic structure shielding surface with convex and concave is designed by using contour stealth technology.Firstly,four models with different shapes are established to carry out electromagnetic simulation calculation and compared with experimental measurement results,which show that the correlation coefficients between the simulation and experimental data are above 0.9,and the simulation results are accurate and usable.Secondly,the electromagnetic scattering mechanism of each model is analyzed to provide a theoretical basis for the shape design of the shielding surface.Then,the shielding surface with fluctuating characteristics is designed and after simulation calculation,it is found that the reflection coefficient of the shielding surface is less than -10 dB when the convex and concave degree radius r reaches 24mm,and the reflection coefficient is less than -17 dB when r reaches 28mm.Finally,the raised part of the shielding surface is filled with thermal insulation material,and it is simulated to be covered on the equipment with an operating temperature of 80℃.It is found that the temperature of the shielding surface with thermal insulation material is reduced by 3.5℃,which has a certain infrared camouflage effect.