论文部分内容阅读
采用红外传感器观测海面,若观测天顶角较大,则视场中会同时出现海面与天空背景.通过计算传感器每一像素单元接收的辐射强度,可以得到海天背景多谱段光学图像.为了计算假定海况条件下海面随观测方向变化的反射辐射,基于几何光学原理修正了传统海面辐射特性模型.由于路径长度随传感器垂直视场变化,此时大气对辐射传输的影响十分显著.天光及水平路径辐射采用改进的大气辐射传输模型计算.该模型具有更高的光谱分辨率,适用于多谱段成像仿真.基于给出的海面辐射特性模型和大气辐射传输模型,分别仿真了不同时刻不同观测角下可见光、中波红外和长波红外的海天背景辐射图像.仿真结果符合物理原理,与实测图像的对比验证了新模型的可靠性.
If the observational zenith angle is large, the sea surface and sky background will appear simultaneously in the field of view.On the basis of calculating the intensity of the radiation received by each pixel unit of the sensor, multi-band optical image of the sea background can be obtained.In order to calculate Based on the principle of geometrical optics, the model of the radiation characteristics of the sea surface is modified based on the assumption that the sea surface changes with the observational direction under the sea-state conditions. Since the length of the path changes with the vertical field of view of the sensor, the influence of the atmosphere on the radiation transmission is significant. The radiation is calculated by the improved atmospheric radiative transfer model, which has higher spectral resolution and is suitable for multi-spectral imaging simulation.Based on the given sea surface radiation characteristics model and atmospheric radiation transmission model, the different observation angles Under the visible, mid-infrared and long-wave infrared background radiation images, the simulation results are in accordance with the physical principles and the comparison with the measured images verifies the reliability of the new model.