中国空间科学技术2024，Vol.44Issue(1)：124-134,11.DOI:10.16708/j.cnki.1000-758X.2024.0014
电离层对月基对地观测平台辐射成像的影响
Influence of ionosphere on radiation imaging for Moon-based Earth observation platform
摘要
Abstract
Moon-based Earth observation is a new space observation method,which conducts continuous and long-term observations of the Earth through the Moon platform.It has unique disadvantages such as large viewing angle,high width,multi-angle imaging,high time resolution,and long design life.The ionosphere is located in the high-altitude area up to 1 000 km above the Earth's surface,and it is an important factor affecting the quality of Moon-based Earth observation imaging.To explore the thermal infrared and microwave radiation characteristic for Moon-based Earth observation,the ionosphere influence on microwave imaging for Moon-based Earth observation platform was analyzed,and the attenuation value in microwave radiation brightness temperature under different latitude areas was simulated.First,the ionospheric electron concentration and the refractive index change law were estimated based on the Chapman distribution.Then the attenuation for different heights as well as transmission paths during ionosphere passing through were calculated,which used the observed zenith angle,collision frequency,etc.Finally,the integration method was adopted to obtain the thermal infrared and microwave energy attenuation in the ionosphere.Results show that the thermal infrared and microwave energy attenuation in the ionosphere of Moon-based Earth observation platform depends on the collision frequency,band,and viewing zenith angle.The ionosphere has greater effect on thermal infrared imaging than microwave imaging for Moon-based Earth observation.In addition,the Moon-based microwave brightness temperature value in the low latitude regions is greatly affected by the ionosphere attenuation with a decrease of about 1.304 K,followed by the mid-latitude regions.关键词
月基对地观测/热红外/微波/电离层/能量衰减/折射率Key words
Moon-based Earth observation/thermal infrared/microwave/ionosphere/energy attenuation/refractive index分类
天文与地球科学引用本文复制引用
袁立男,廖静娟,董书莉,武文波,贺强民..电离层对月基对地观测平台辐射成像的影响[J].中国空间科学技术,2024,44(1):124-134,11.基金项目
国家自然科学基金重大项目(41590855) （41590855）
中国科学院前沿科学重点研究计划项目(QYZDY-SSW-DQC026) （QYZDY-SSW-DQC026）
