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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
Source Publication遥感学报
KeywordPolarimetric Microwave Radiometer Ocean Wind Direction Ambiguity Onboard Calibration Scanning Geometry
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
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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