红外技术2025，Vol.47Issue(4)：410-420,11.
FY-3D卫星MERSI-Ⅱ热红外通道劈窗仿真计算简化方法
Simplified Calculation Method of FY-3D Satellite MERSI-Ⅱ Thermal Infrared Channel Split-Window Simulation
吴文菲 1李正强 2姚前 2周士凯 3许华 4陈震霆 5江启峰6
作者信息
- 1. 西华大学能源与动力工程学院流体及动力机械教育部重点实验室,四川成都 610039||中国科学院空天信息创新研究院国家环境保护卫星遥感重点实验室,北京 100101
- 2. 中国科学院空天信息创新研究院国家环境保护卫星遥感重点实验室,北京 100101||中国科学院大学,北京 100049
- 3. 中国科学院空天信息创新研究院国家环境保护卫星遥感重点实验室,北京 100101||南京工业大学测绘科学与技术学院,江苏南京 211816
- 4. 中国科学院空天信息创新研究院国家环境保护卫星遥感重点实验室,北京 100101
- 5. 昆明学院信息工程学院,云南 昆明 650214
- 6. 西华大学航空航天学院流体及动力机械教育部重点实验室,四川成都 610039
- 折叠
摘要
Abstract
The split-window algorithm has been widely applied for surface temperature inversion of various satellite payloads.The iterative simulation of large datasets during the fitting of split-window algorithm coefficients is often time-consuming and inefficient.Therefore,it is important to develop a highly efficient simplification method for split-window simulation computations.MODTRAN was to simulate and analyze the impact of variations in background parameters on total radiance.Subsequently,we performed a simulation analysis of the relationship between key parameters and total radiance under two adjacent thermal infrared channels of FY-3D MERSI-Ⅱ,exploring the variation patterns of total radiance under different coupling scenarios of these key parameters.Simulation results reveal that under the MERSI-Ⅱthermal infrared channels,changes in land surface temperature have a greater impact on total radiance than surface emissivity.The effect of the atmospheric water vapor content concentration on the total radiance increases with an increase in both the land surface emissivity and land surface temperature,whereas the influence of the land surface emissivity and land surface temperature on the total radiance decreases as the atmospheric water vapor content concentration increases.When determining the coefficients for the split-window algorithm,narrowing the range of the atmospheric water vapor content concentration can reduce the number of simulations required,thereby enhancing the efficiency.For land surface temperatures ranging from 300 to 320 K,the atmospheric water vapor content concentration should be within 0.5 to 5.5 g/cm2;for temperatures ranging from 270 to 300 K,this range narrows to 0.5 to 4.0 g/cm2.The saved simulation runs account for 18.23％of the total number of runs,which reduces the simulation time by 26 min.A comparison of the split-window coefficient fitting and absolute difference calculation results before and after simplification shows that the simplified scheme has minimal impact on the fitting outcomes.关键词
热红外/MODTRAN/仿真计算/劈窗算法Key words
thermal infrared/MODTRAN/simulation calculation/split-window algorithm分类
信息技术与安全科学引用本文复制引用
吴文菲,李正强,姚前,周士凯,许华,陈震霆,江启峰..FY-3D卫星MERSI-Ⅱ热红外通道劈窗仿真计算简化方法[J].红外技术,2025,47(4):410-420,11.
