无人机红外辐射特性建模及图像仿真计算具有重要意义。利用CFD软件计算无人机温度分布, 建立了蒙皮稳态温度数据库和满足精度需求的温度插值算法, 实现了无人机蒙皮温度的插值计算; 提出网格编号投影思想, 改进基于深度缓存的正交投影方法, 建立了适于红外图像的二维投影算法; 基于无人机辐射、大气传输和探测器响应的光谱特性, 采用光谱积分方式计算无人机光谱及波段红外特性和图像序列, 建立了无人机红外辐射计算模型。对无人机红外辐射特性和模型计算速度进行了分析, 并与某型无人机实测数据进行了比对, 结果表明: 模型计算误差小于20%, 可用于仿真实验测试与分析。

It′s significant to research the infrared radiation model and simulate infrared image of unmanned aerial vehicle(UAV). The interpolation calculation of skin temperature was realized, based on the database of steady-state temperature distribution of the UAV which was calculated in use of CFD. Due to the new method of grid number projection, the orthogonal projection of depth buffer was improved and a two-dimensional projection algorithm for infrared image was implemented. The IR model of UAV was finally built to calculate spectral and band of infrared image, in which atmospheric transmission and detector response were both considered. The UAV infrared characteristics of the whole trajectory and calculation speed of this model were analyzed. The simulation value was compared with the measured flight experiment data, the results show that the relative error is less than 20% and can be used for experiment test and analysis.