| 飞行器红外物理成像仿真优化计算方法 |
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| 引用本文： | 于鲲,段雨晗,丛明煜,戴文聪.飞行器红外物理成像仿真优化计算方法[J].红外与激光工程,2021,50(4):20200241-1-20200241-14. |
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| 作者姓名： | 于鲲 段雨晗 丛明煜 戴文聪 |
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| 作者单位： | 哈尔滨工业大学 航天学院 空间光学工程研究中心，黑龙江 哈尔滨 150006 |
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| 摘 要： | 为满足红外成像探测系统研制过程中的高精度仿真图像需求，建立了飞行器红外物理成像辐射传输模型，并采用光线跟踪方法实现辐射亮度图像仿真。针对飞行器蒙皮反射特性与辐射源分布特性的差异，提出了直接光照多重重要性采样蒙皮辐射亮度计算优化方法；针对飞行器尾焰发射能力强、消光能力弱的特点，提出了混合积分尾焰辐射亮度计算优化方法。通过仿真实验对物理成像模型和计算优化方法的正确性与有效性进行了验证，蒙皮辐射计算相对误差优于0.05%，尾焰辐射计算相对误差优于0.1%，相比于传统光线跟踪方法，计算优化方法具有更快的收敛速度和更强的适应性。对隐身飞机进行了红外成像仿真和辐射特性分析，仿真结果表明，红外隐身技术能够降低中波和长波谱段的辐射强度，会增加短波谱段的反射辐射强度。
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| 关 键 词： | 物理成像 光线跟踪 红外隐身 红外辐射 飞行器 |
| 收稿时间： | 2020-06-22 |
Optimal calculation method of aircraft infrared physical imaging simulation |
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| Affiliation: | Research Center for Space Optical Engineering, School of Astronautics, Harbin Institute of Technology, Harbin 150006, China |
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| Abstract: | In order to meet the needs of high-precision simulation images in the development process of infrared imaging detection system, the infrared physical imaging radiation transmission model for aircraft was established, and the ray tracing method was used to realize the simulation calculation of radiance image. Aiming at the difference between the reflection characteristics of the aircraft skin and the distribution characteristics of the radiation source, an optimization method for skin radiance calculation using direct lighting multi-importance sampling was proposed. Aiming at the characteristics of strong emission ability and weak extinction ability of aircraft exhaust plume, an optimization method for exhaust plume radiance calculation using combining integration was proposed. The correctness and effectiveness of the physical imaging model and calculation optimization method were verified through simulation experiments. The relative error of the skin radiation calculation is better than 0.05%, and the relative error of the tail flame radiation calculation is better than 0.1%. Compared with the traditional ray tracing method, the calculation optimization method has a faster convergence speed and stronger adaptability. Infrared imaging simulation and radiation characteristics analysis of stealth aircraft were carried out. The simulation results show that infrared stealth technology can reduce the radiation intensity in the mid-waveband and long-waveband, and increase the reflected radiation intensity in the short-waveband. |
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