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为探测空中涂层隐身目标,建立了地面辐射计对空中目标进行锥形扫描的天线温度对比度计算模型。在目标下方分别为高发射率地面和低发射率水面的情况下,对晴天时平面隐身目标和光洁金属目标的天线温度对比度进行了对比计算。将3 mm波段辐射计系统固定在地面上,目标分别悬挂于水泥地面和水池上方10 m高度处,分别在晴天和阴天时,采用辐射计系统对隐身目标和光洁金属目标进行了探测实验。计算和实验结果说明,涂层隐身目标比同等大小的光洁金属目标的天线温度对比度大,当目标下方地物的发射率较小时,差别更大。在毫米波被动探测下,空中金属目标表面的吸波材料涂层,不仅不能起到隐身效果,反而会更明显地暴露目标。
In order to detect stealth targets in airborne coating, a model of antenna temperature contrast was established by using a pyrheliometer to scan the air target. In the case of high emissivity ground and low emissivity water surface under the target, the contrast of the antenna temperature between flat stealth targets and smooth metal targets in sunny days was compared. The 3 mm band radiometer system was fixed on the ground and the targets were respectively suspended at a height of 10 m above the concrete floor and the pool. In the sunny and cloudy days, radiometric systems were used to detect stealth targets and smooth metal targets. Computation and experimental results show that the stealthy target of the coating has a larger contrast in the temperature of the antenna than that of a smooth metal target of the same size. When the emissivity of the object under the target is small, the difference is greater. Passive detection of millimeter waves, airborne metal target surface absorbing material coating, not only can not play stealth effect, but will be more obvious exposure target.