Dynamic Modeling and Simulation Analysis of Infrared Radiation Characteristics for Fixed-wing Aircraft

To address the limitations of traditional fixed-wing aircraft infrared (IR) modeling—specifically the low coupling of static parameters and the difficulty in characterizing dynamic flight processes—this paper proposes a real-time IR radiation modeling and simulation method based on dynamic parameterization. First, a multi-band IR spectral integration mechanism is derived based on Planck’s law to ensure physical accuracy of temperature-to-radiance mapping. Second, a component-based modeling strategy is adopted to construct a dynamic temperature response model that tightly couples aerodynamic heating effects with engine throttle control states. Furthermore, 3D rendering technology is introduced to achieve the automated calculation of projected areas for complex geometric shapes via GPU parallel acceleration. On this basis, a multi-parameter coupled data interface is established. Simulation experiments on a generic fixed-wing aircraft demonstrate that the proposed method accurately reflects the influence of flight altitude, Mach number, observation angle, and engine throttle state on IR signatures. The variation trends of the IR characteristics are highly consistent with the integration characteristics of Planck’s curve. The research results provide significant theoretical support for the optimal design of IR detection systems.