水下航行器热尾流目标海平面探测红外成像仿真

红外成像是探测水下航行器海平面热尾流目标的重要方法。采用建模仿真的方法,基于尾流区海平面温度分布特征,结合三维坐标变换和投影映射方法实现热尾流目标的红外成像仿真过程,得到在相同探测条件下热尾流的辐射能量随波段的分布,以及不同探测方位角与高度下热尾流在像平面内的形态及红外辐射亮度的变化规律。论证了噪声对典型工况条件的热尾流与背景海面的对比度和清晰度,以及热尾流目标的探测和识别难度的影响。仿真结果表明:相同探测条件下,热尾流在8 μm^12 μm波段的辐射能量远远大于3 μm^5 μm波段;随着探测高度的增加,热尾流区域的红外辐射观测亮度逐渐减小;探测路径长度一定时,探测天顶角增大,热尾流红外辐射观测亮度减小,并且热尾流在像平面内所占区域逐渐减小。

Infrared imaging simulation of sea surface detection of underwater vehicle thermal wake target

Infrared imaging is an important method to detect the thermal wake target on sea surface of underwater vehicles. By utilizing the modeling and simulation method, based on the sea surface temperature distribution characteristics of the wake region, combined with the space coordinate transformation and projection mapping method, the infrared imaging simulation process of the thermal wake target was realized. Under the same detection conditions, the distribution of the radiant energy of the thermal wake with the band, and the variation of the shape of the hot wake in the image plane and the brightness changing law of the infrared radiation under different azimuths and heights were obtained. The effects of noise on the thermal wake under typical working conditions and the contrast and sharpness of the sea surface, as well as the difficulty of detecting and identifying the thermal wake target were demonstrated.The simulation results show that under the same detection conditions, the radiant energy of the thermal wake in the 8 μm~12 μm band is much larger than the 3 μm~5 μm band; when the length of the detection path is constant, with the angle of the detection zenith increasing, the observed brightness of the infrared radiation of the thermal wake decreases, and the area occupied by the thermal wake in the image plane gradually decreases.