嫦娥一号和二号卫星微波探测仪数据的交叉定标与一致性

王雪影; 王振占; 张德海; 姜景山

doi:10.11728/cjss2021.04.635

嫦娥一号和二号卫星微波探测仪数据的交叉定标与一致性

doi: 10.11728/cjss2021.04.635

1. 中国科学院国家空间科学中心微波遥感技术重点实验室北京 100190;
2. 中国科学院大学北京 100049

基金项目:

北京市科技计划空间科学大数据管理与应用服务平台建设课题资助（Z181100002918002）

详细信息

作者简介:
王雪影,E-mail:wangxueying18@mails.ucas.ac.cn

通讯作者:
王振占,E-mail:wangzhenzhan@mirslab.cn

中图分类号: P122
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- 被引次数: 0
出版历程
- 收稿日期: 2020-01-10
- 修回日期: 2020-10-28
- 刊出日期: 2021-07-15

Cross-calibration and Consistency of Microwave Sounder Data of Chang'E-1 and Chang'E-2 Satellites

1. Key Laboratory of Microwave Remote Sensing, National Space Science Center, Chinese Academy of Sciences, Beijing 100190;
2. University of Chinese Academy of Sciences, Beijing 100049

摘要

摘要: 嫦娥一号（CE-1）和嫦娥二号（CE-2）卫星分别于2007年和2010年发射，其上搭载着相同的微波探测仪（CELMS）.由于在轨定标和探测时间不同，两星的CELMS数据存在差异.为了提高数据的一致性，基于月球极区永久阴影区（PSR），利用两步定标法对两星的CELMS数据进行交叉定标和时间校正.通过对不同纬度的亮温进行分析可知：两星的CELMS数据在3GHz，19.35GHz和37GHz通道的一致性良好；在中低纬度区域，CE-2卫星7.8GHz通道的亮温较CE-1卫星高，随着纬度的升高，差异逐渐变小并趋于一致.为避免经度跨度大对亮温的影响，选取云海盆地对交叉定标结果进行定量分析，结果表明两星在该区域的一致性良好，平均误差小于0.2K.由此可知，交叉定标和时间校正明显提高了两次观测数据的一致性，减小了由测量误差和时间变化引起的差异.
- 嫦娥卫星 /
- 微波探测仪 /
- 交叉定标 /
- 永久阴影区
Abstract: Chang'E-1 (CE-1)and Chang'E-2 (CE-2) orbiters were launched in 2007 and 2010, respectively, with the same microwave sounders CELMS (Chang'E Lunar Microwave Sounder). In-orbit calibration and time changes lead to differences between the CELMS data obtained by CE-1 and CE-2. To improve the consistency of CELMS data, the two-step calibration method is used to cross-calibrate CELMS data obtained by two orbiters based on permanently shadowed polar region of the Moon. Later, time correction was applied to reduce the effect of time on Brightness Temperature (TB). The analysis of TB at different latitudes shows that the two kinds of CELMS data have good consistency in 3GHz, 19.35GHz and 37GHz channels, while the 7.8GHz TB of CE-2 is higher than that of CE-1 in the low and middle latitudes, and the difference decreases with the increase of latitude. To avoid the effect of large longitude span, Mare Nubium impact basin was selected for further quantitative analysis of cross-calibration results. Analysis shows CELMS data are highly consistent in the region, and the average error is less than 0.2K. It is concluded that cross calibration and time correction significantly improve the consistency of the two observations and reduce the differences caused by measurement errors and time changes.
- Chang'E orbiter /
- Microwave sounder /
- Cross-calibration /
- Permanently Shadowed region

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