2008, Volume 10, Issue 6
Strategic Study of CAE >> 2008, Volume 10, Issue 6
Critical technique and scientific topic on fully polarized microwave radiometer remote sensing sea surface wind vector
Center for Space Science and Applied Research, CAS, Beijing 100190 China
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Abstract
Microwave microwave polarimeter is a sensor of measuring not only the vertical-and horizontal-polarization, but also the third and/or the forth Stokes parameters. It realizes all information about electromagnetic wave, including frequency, phase, amplitude and polarization,to be measured by a senor. The correlated information of the first two Stokes parameters is more sensitive to the anisotropy of the ocean surface. Wind direction retrieval is one of the initial motivations of the polarimeter development. In this paper, the progress and characteristic on polarimeter development are introduced and theories of ocean wind vector remote sensing are analyzed. Oceanic emission and scattering model is develoked for remote sensing wind vector using passive polarimetric microwave radiometer. The critical techniques on its system design, which include receiver and calibration methods, are discussed in order to realize scientific target of wind retrievals. Furthermore more efforts are paid on expatiating scientific topics on wind reversion methods, including geophysical model function built-up, influences of main technical specifications on retrieval precision, and wind direction ambiguity removal methods by data-processing methods and scanning geometry. The calibration errors and main specifications of polarimetric radiometer,which have significant influences on the accuracy of wind vector retrieval,are summed in detail.Finally,a new scanning geometry with fore-aft-look to remove wind direction ambiguous solution is put forward.
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References
[ 1 ] Yueh S,Wilson W, Li F S,et al.Polarimetric measurements of sea surface brightness temperatures using an aircraft K -band radiom- eter[ J] .IEEE Trans.Geosci.Remote Sensing, 1995 , 33 ( 1 ) : 85 – 92 link1
[ 2 ] Yueh S, et al.Polarimetric brightness temperatures of sea surfaces measured with aircraft K -and Ka -band radiometers[ J] .IEEE Trans.Geosci.Remote Sensing, 1997 ,35 ( 5 ) : 1177 -1187 link1
[ 3 ] B.Laursen, et al.Wind direction over the ocean determined by an airborne, imaging, polarimetric radiometric radiometer system [ J] .IEEE Trans.Geosci.Remote Sensing, 2001 ,39 ( 7 ) : 1547 -1555 link1
[ 4 ] Wentz F J, Gentemann C, Smith D, et al.Satellite measurements of sea surface temperature through clouds [ J] .sciences, 2000 , 288 ( 5467 ) :847 -850 link1
[ 5 ] Smith P M.The emissivity of sea foam at 19 and 37 GHz [ J] . IEEE Trans.Geosci.Remote Sensing, 1988 ,GE -26 : 541 -547 link1
[ 6 ] Yueh S H, Wilson W J, Dinardo S J, et al.Polarimetric micro- wave brightness signatures of ocean wind directions [ J ] .IEEE Trans.Geosci.and Remote Sens, 1999 , 37 ( 7 ) : 949 -959 link1
[ 7 ] Yueh S H.Estimates of Faraday rotation with passive microwave polarimetry for microwave remote sensing of Earth surfaces [ J ] . IEEE Trans.Geosci.Remote Sensing, 2000 , 38 ( 5 ) : 2434 - 2438 link1
[ 8 ] Yueh S H .Modeling of wind direction signals in polarimetric sea surface brightness temperatures[ J] .IEEE Trans.Geosci.and Re- mote Sens, 1997 , 35 ( 6 ) : 1400 -1418 link1
[ 9 ] Reul N, Chapron B.SMOS - Salinity data processing study - improvements in emissivity models [ S] .WP 1100 Report, CLS / IFREMER /NERSC Study, ESA contract No.15165 /01 /NL /SF, October, 2001
[10] Rose L A, Asher W E., et al.Radiometric Measurements of the microwave emissivity of foam[ J] .IEEE Trans.Geosci.and Re- mote Sens, 2002 , 40 ( 12 ) : 2619 -2624 link1
[11] 殷晓斌,王振占,姜景山,等.全极化微波辐射计遥感海面风场的机理和验证[A].第二届微波遥感技术会议[C],深圳,2006
[12] Wang Zhenzhan, Yin Xiaobin, Liu Jingyi, et al.Consideration on accuracy and efficiency of two -scale polarimetric emissivity model used for oceanic passive microwave remote sensing [ J ] . IEEE 2007 International Symposium on Microwave, Antenna, Propagation, and EMC Technologies For Wireless Communica- tions,2007 , 2 : 1463 -1466 link1
[13] 王振占.海面风场全极化微波辐射测量—原理､系统设计与模拟研究[D].北京:中国科学院空间科学与应用研究中心,2005
[14] Lahtinen J, Pihlflyckt J, Mononen I, et al.Fully polarimetric microwave radiometer for remote sensing [ J] .IEEE Transactions on Geoscience and Remote Sensing, 2003d,41 ( 8 ) : 1869 -1878 link1
[15] Lahtinen J, Hallikainen M.HUT Fully Polarimetric Calibration Standard for microwave radiometry[ J] .IEEE Transactions on Ge- oscience and Remote Sensing, 2003c , 41 ( 3 ) : 603 -611 link1
[16] 刘璟怡.全极化微波辐射计定标和风场反演若干问题研究[D].北京:中国科学院空间科学与应用研究中心,2007 link1
[17] Saunder,R.RTTOV8.5 software[ S] .from ECMRF ,2004b
[18] Liebe, H J, Hufford G A, Cotton M G.Propagation modeling of moist air and suspended water /ice particles at frequencies below 1000 GHz[ A] .in AGARD 52nd Specialists Meeting of the Elec- tromagnetic Wave Propagation Panel, Palma de Mallorca, Spain, 1993 :3.1 – 3.10 link1
[19] Johnson J T.An efficient two -scale model for the computation of thermal emission and atmospheric reflection from the sea surface [ J] .IEEE Trans.Geosci.and Remote Sens, 2006 ,44 ( 3 ) : 560 -568 link1
[20] Wentz F J, Thomas Meissner, Smith D K.Assessment of the ini- tial release of windSat wind retrievals[ S] .RSS technical report, 2005 link1
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