精确制导武器在大气中高速飞行时，受到复杂绕流流场影响，接收的目标图像产生畸变退化，形成气动光学效应，降低成像探测系统的精度。以半球头罩红外空空导弹为研究对象，通过计算流体力学方法得到典型飞行状态下头罩外流场参数分布。针对传统流场网格正规化处理精度损失问题，提出运用广义回归神经网络和 Barron 算子方法获取空间任意点折射率及其梯度值。考虑平面光线追迹局限性，使用变步长龙格库塔法实现三维空间光线追迹，从光路偏折和波前传输性能分析不同飞行状态下气动光学光路传输效应对红外探测系统的影响。结果表明：该方法能很好地复现目标红外辐射在进入探测器前的近场传播过程。%Affected by surrounding flow field of dome, the target images received by a precision⁃guided weapon will suffer distortion and degradation when it flies at high speed in the atmosphere. This is called aero⁃optical effect, which reduces the precision of imaging detection system. We research on typical infrared air to air missile with a hemispheric irdome. The external flow field parameters of irdome under special flight status is calculated using com⁃putational fluid dynamics method. To get rid of accuracy loss in traditional mesh regularization process, generalized regression neural network and Barron operator are applied to getting refractive index and its gradient values at any point in space. Considering the limitation of plane tracing, we accomplish ray tracing in space with variable⁃step Runge Kutta. Light deflection and wavefront transmission performance are obtained to analyze the impact of aero⁃op⁃tical transmission effect on infrared detection system under different flight conditions. The proposed approach posses⁃ses great ability of reproducing near⁃field transmission of infrared radiation before it enters the detector.
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