近海面大气折射对红外探测距离的影响

Refraction effects on infrared system detection ranges in near sea surface

基于几何光学和抛物线近似方法建立光线传播轨迹数学模型,计算最大探测距离(MIVR),并分析蜃影出现的成因。通过数值分析及海上试验的对比验证,结果表明:在相同的风速条件下,MIVR会随海气温差的增大而减小;当海气温差不变时,随着风速的增大,MIVR逐渐减小;海气温差越大,MIVR的递减量越趋于平缓;MIVR与高度位置的对应关系几乎是一条标准的直线,且MIVR随着高度参数的减小而递减;通过与试验数据的对比,模型评估MIVR的准确率较高。

This paper established optical propagation tracing mathematical model based on geometrical optics and parabolic approximation method,extracting maximum inter-vision ranges（MIVR） to denote the absolute detection range limit imposed by refraction for a given sensor and target height,determining the appearance mechanism of mirage.When wind speed is constant,MIVR decreases with the increase of air-sea difference in temperature（ASTD）;but MIVR decreases with the increase of wind speed under the constant ASTD;the MIVR decreases with ASTD increasing,the corresponding relationships of MIVR and the height position is a standard straight line,and MIVR reduces with the height parameter decreasing;the accuracy of MIVR is better.