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一种消除全极化微波辐射计顺/逆风向遥感模糊性的新方案——星上定标和扫描机制设计的有关考虑(英文)
Alternative TitleRemoving upwind/downwind ambiguity of ocean wind direction by polarimetric microwave radiometer:scheme design on on-orbit calibration and scanning geometry
王振占; 刘璟怡; 殷晓斌; 姜景山; 北京8701信箱
Department国家863计划微波遥感技术实验室
Source Publication遥感学报
2009
Volume13Issue:2Pages:190-196
ISSN1007-4619
Language英语
KeywordPolarimetric Microwave Radiometer Ocean Wind Direction Ambiguity Onboard Calibration Scanning Geometry
Abstract从观测方式的角度出发,讨论消除全极化微波辐射计遥感风向(顺风/逆风)模糊性的具体实施方案,提出合理进行星上定标和对地观测的设计思想。在研究全极化辐射计星上外定标方法的基础上,依据消除海面风向反演模糊性的算法,提出一种采用侧视扫描的机制,设计了在星上实现全极化微波辐射计对同一面元进行前、后两次扫描的具体方案,给出了一种在扫描周期内合理分配观测方位角和定标单元的方法。模拟结果表明,采用这种机制可以有效消除全极化辐射计风向反演存在的顺/逆风180°模糊,使风向反演精度大大提高。同时,考虑到卫星上空间资源的限制,单侧扫描刈幅宽度还能够达到760km以上,能够满足在较短的时间内覆盖全球的时间分辨率的要求。
Other AbstractPolarimetric microwave radiometer, a new type of remote sensor, can measure not only the first two Stokes parameters, but also the third and the fourth Stokes parameter of ocean surface radiation. Thus it opens a new field of microwave remote sensing on wind vectors. There is wind direction ambiguity in actually retrieved oceanic wind field using fully polarimetric radiometer data because wind direction signals in T_v and T_h are very small comparing with other geophysical parameters, while T_3 and T_4 are basically two order smaller than those of horizontal and vertical polarization, and meanwhile there are calibration errors in each Stokes parameters. In this paper, we dedicate to improve the calibration accuracy by designing a fully onboard calibrator and reasonably allocating time for calibration and observation during one scan cycle. The theory of polarimetric microwave radiometer calibration is given and the actual considerations of the on-board fully polarimetric calibration standard are demonstrated. An original idea of calibrating polarimetric radiometer on satellite is presented. The relation between scan mode and wind direction retrieval error is analyzed. A new scanning geometry to remove these wind direction ambiguous solutions is devised and modeled. Simulation results show this kind of scanning geometry can remove wind direction ambiguity effectively. The accuracy of wind direction retrieval can be improved to 15°. On the other hand, due to the limited space on satellite, the swath of a single side scan can reach above 760 kilometers.
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1867
Collection微波遥感部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
王振占,刘璟怡,殷晓斌,等. 一种消除全极化微波辐射计顺/逆风向遥感模糊性的新方案——星上定标和扫描机制设计的有关考虑(英文)[J]. 遥感学报,2009,13(2):190-196.
APA 王振占,刘璟怡,殷晓斌,姜景山,&北京8701信箱.(2009).一种消除全极化微波辐射计顺/逆风向遥感模糊性的新方案——星上定标和扫描机制设计的有关考虑(英文).遥感学报,13(2),190-196.
MLA 王振占,et al."一种消除全极化微波辐射计顺/逆风向遥感模糊性的新方案——星上定标和扫描机制设计的有关考虑(英文)".遥感学报 13.2(2009):190-196.
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