红外探测器对高超声速飞行器的作用距离分析

为了对临近空间高超声速飞行器进行有效探测预警,计算天基红外探测器的作用距离。首先分析不同的对比度的区别,根据探测几何关系,考虑到目标、背景到探测器之间的大气透过率差异、路径辐射的影响,构建了基于表观对比度的作用距离模型,给出了逐步逼近的求解流程,同时指出模型中的参数仅是波长的函数,与探测距离无关。然后根据实际的飞行器和海洋背景,对天基红外探测器的作用距离进行仿真计算,仿真指出,侧视探测方向下可以取的最大的作用距离；相同速度和探测方向下,中波波段的作用距离均高于长波波段；随着飞行速度的增加,中波波段作用距离的增加量要大于长波波段。

Operation range analysis of the infrared detector for hypersonic flight vehicles

In order to carry out effective detection and early warning for hypersonic vehicles in nearby space,the operating range of spaceborne infrared detector is calculated.The differences of infrared contrasts are given at first.Then a new operation range model is given where different transmittances of target-detector and background-detector and the path thermal are added according to the detection geometry.In addition,a systematic approximation method is presented for the feasible solution to the operation range function.At the same time,it is pointed out that the parameter in the model is only a function of the wavelength and has nothing to do with the detection distance.Then,the operation range of spaceborne infrared detector is simulated based on the specified flying vehicle and sea background.The simulation indicates that the largest range is obtained on side-looking angle.Under the same looking angle and speed,the operation range is larger in the medium wave than that in the long wave;the increase of the operating distance in the medium wave band is larger than that in the long wave band.