| Atmosphere and clouds are the main background source of space-based infrared target detection system. How to simulate radiometric images of atmosphere and clouds scenes effectively and authentically is an important research direction at home and abroad, which can affect the validity of the results from simulation experiments in space-based infrared target detection systems.In the process of infrared background simulation, remote-sense data of actual space-based detection are often chosen as data source of radiation transformation. In this paper, MODIS multi-spectral data is chosen to be studied with spilt window method, which is aimed at surface temperature of the world. In addition, cloud boundary in the study area is determined with the experiential MODIS cloud detection method for southeast coastal and central China, which lies the foundation for radiation calculation of clouds and atmosphere.In terms of infrared radiation calculation of the scene, a detailed calculation scheme of cloud radiation and a simplified calculation scheme of atmospheric background are proposed. For clouds in the study area, the surface reflectance properties were studied with the model of optical thickness and bid irectional reflectance distribution function(BRDF), and the emission points and reflection points of each cloud pixel are identified. Combined with the cloud intrinsic radiation and atmospheric transmittance, infrared cloud radiation is calculated accurately.In terms of image simulation of high rail detector, an image projection transformation model is proposed, to achieve a continuous image sequence, which is able to assign curvature of the world to the image sequence. A high-orbit image sequence is obtained combining the modulation transfer function(MTF) and the noise model. Besides, the validity of the simulation model is verified by the stati c and dynamic consistency test.The simulation of this paper mainly depends on ENVI(IDL) remote scene data processing platform and MATLAB scientific computing platform. In this paper, the whole process of high-orbit infrared imaging is discussed, and focused on the way of information acquisition and radiation transformation based on real remote-sense data. This paper had certain value for the topic of space-based infrared scene simulation. |
