基于通道相关模型构建的中红外高光谱地表发射率模拟

Simulation of Mid-infrared Hyperspectral Surface Emissivity Based on Channel Correlation Model

星载高光谱图像获取少,卫星发射成本高,同时中红外通道机理复杂,模拟难度大,图像模拟的研究工作缺乏。针对上述问题,本文首先对通道之间的相关性进行分析;其次在统计分析的基础上,构建数据模拟模型,模型平均相对误差均小于10%。运用FY4A热红外数据;最终模拟2.5-5.0μm,光谱分辨率为50 nm的中红外波段高光谱地表发射率数据。本文构建的模型可为中红外波段的图像模拟与载荷研制等应用提供理论支撑,为中红外高光谱图像模拟提供方法和手段;可为遥感器载荷设计过程中方案的可行性分析与论证、设计制造、运维以及后期管理保障提供重要的理论基础。

The acquisition of spaceborne hyperspectral images is rare,the cost of satellite launch is high,and the mechanism of mid-infrared channel is complex,so it is difficult to simulate,and the research work of image simulation is lacking.To solve the above problems,this paper first analyzes the correlation between channels,and then builds a data simulation model on the basis of statistical analysis.The average relative errors of the models are all less than 10%.FY4A thermal infrared data was used to finally simulate the mid-infrared band hyperspectral surface emissivity data of 2.5—5.0μm with spectral resolution of 50 nm.The model constructed in this paper can provide theoretical support for the application of mid-infrared band image simulation and load development,and provide methods and means for mid-infrared hyperspectral image simulation.It can provide an important theoretical basis for the feasibility a-nalysis and demonstration,design and manufacture,operation and maintenance,and late management guarantee of remote sensing load design.