Geometric Simulation of Earth’s Outgoing Radiation Viewed from a Moon-Based Platform
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摘要: 月基平台以其整体性、多角度、长周期等特点，可望实现对地球整体辐射收支进行精确估算。为了评估月基平台对地球辐射能量的观测能力，建立了基于地月几何关系的一一映射算法，使用戈达德地球观测系统模型第五版（Goddard Earth Observation System model version 5，GEOS-5）数据作为模型输入，用以模拟月基视场地球向外辐射能量，从而形成对月基观测的地球辐射能量规律性认识。结果表明：月基传感器可以观测包括极区在内约178°跨度的经纬度区域；月球变轨道倾角将为地球高纬度地区提供更好的观测条件，极区观测高度角可达到60°。该模拟方法可以为观测地球向外辐射提供有效支持，为后续研究打下坚实的基础。Abstract: Due to the characteristics of integrity, multi-angle and long period, a Moon-based platform is expected to accurately estimate Earth outgoing radiation. To evaluate this platform’s capabilities, this paper established a one-to-one mapping algorithm based on the geometric relationship and used the Goddard Earth Observing System model version 5 (GEOS-5) data as model input to simulate Earth’s outgoing radiation viewed from a Moon-based platform, so as to learn about the regularity of Earth outgoing radiation viewed from the Moon-based platform. Results show that a Moon-based platform can cover about 178° both in latitudinal and longitudinal direction in one image, including the polar regions. The changing inclination of the orbit of the Moon gives a better observation condition for high latitude regions, and the viewing zenith angle in polar regions can reach to 60°. These results indicate the simulation method can effectively support the observation of Earth’s outgoing radiation observation and lay the foundation for future research.Highlights
● A simulation method for Earth outgoing radiation viewed from a Moon-based platform is proposed based on one-to-one mapping method considering observation geometry of the Earth and the Moon. ● Experiments of Earth outgoing longwave and shortwave radiation viewed from a Moon-based sensor in one year are carried out and the regularity is found out according to the characteristics of the lunar orbit. ● The characteristics of spatial coverage and angular distribution are analyzed. ● The simulation method can effectively support the observation of Earth’s outgoing radiation and lay the foundation for future research. -
图 3 月基平台观测范围覆盖性能流程图
Fig. 3 Flow chart of Moon-based Earth observational coverage performance
图 6 传感器位于月球南极观测地球[24]
Fig. 6 Observation duration of North Pole and South Pole of the Earth when the Moon-based sensor is located at the South Pole of the Moon[24]
图 8 观测天顶角在星下点纬度为28°N和 28°S时的分布
Fig. 8 Distribution of zenith angle when the nadir point is at 28°N and 28°S
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