Please wait a minute...
img

官方微信

遥感技术与应用  2014, Vol. 29 Issue (5): 727-734    DOI: 10.11873/j.issn.1004-0323.2014.5.0727
模型与反演     
一种基于海面背景的WindSat极化通道替代定标方法研究
张勇1,2,3,吕达仁1
(1.中国科学院大气物理研究所中层大气和全球环境探测重点实验室,北京 100029;
2.中国科学院大学,北京 100049;3.北京市应用气象研究所,北京 100029)
Vicarious Calibration of WindSat Polarimetric Channels based Sea Surface Background
Zhang Yong1,2,3,Lv Daren1
(1.Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;
2.University of Chinese Academy of Sciences,Beijing 100049,China;
3.Beijing Institute of Applied Meteorology Research,Beijing 100029,China)
 全文: PDF(1040 KB)  
摘要:

凭借能够测量海面辐射全部4个Stokes参数的能力,全极化微波辐射计成为测量海面风场的一种新手段。由于风向信号仅仅只有几K甚至更小的振幅,故对全极化微波辐射计极化通道的定标精度要求颇高。使用WindSat实测亮温及其海面参数匹配数据集,基于海面风向信号的谐波特征,对WindSat极化通道亮温的定标偏差和仪器噪声进行了计算和分析。研究结果表明:WindSat的10.7、18.7和37.0 GHz这3个频率的极化通道均存在明显的定标偏差,并且该定标偏差会随着升轨和降轨、前向刈幅和后向刈幅等不同观测模态发生变化。另外,WindSat极化通道的仪器噪声较小,其中T3的仪器噪声在0.2 K以内,T4的仪器噪声在0.1 K以内。

关键词: 替代定标WindSat极化通道    
Abstract:

With the ability to measure the whole of four Stokes parameters of sea surface radiation,the fully polarimetric microwave radiometer provides a new technique for measuring sea surface wind vector remote sensing.Because the amplitude of wind direction signal is only a few Kelvins,the absolute calibration accuracy of the third and fourth Stokes parameters brightness temperatures are needed at the tenth of Kelvin level,in order to adequately resolve their ambiguity on wind direction.based on the characteristics of wind direction harmonics,the calibration bias and instrument noise of WindSat polarimetric channels are analyzed by WindSat satellite measured data and collocated QuikSCAT oceanic products.The analysis results show that there are significant calibration biases in the WindSat 10.7,18.7 and 37.0 GHz frequency,and the biases are different on the different observation model,such as ascend orbit,descend orbit,fore swath and aft swath.In addition,the instrument noises of the third Stokes parameters of WindSat are less than 0.2 K,and the fourth Stokes parameters are less than 0.1 K.

Key words: Vicarious calibration    WindSat    Polarimetric channel
收稿日期: 2013-08-10 出版日期: 2014-11-10
:  P 732.1  
基金资助:

中国科学院对外合作重点项目“卫星遥感大气—地球表面耦合系统的新反演方法、地基验证及应用”(GJHZ1207)。

通讯作者: 吕达仁(1940-),男,江苏常熟人,中国科学院院士,主要从事大气与地球环境遥感、大气辐射传输、中层大气与日地物理,生态与气候相互作用的探测与理论模式等研究。Email:ludr@mail.iap.ac.cn。   
作者简介: 张勇(1976-),男,湖南湘潭人,工程师,主要从事卫星大气和海洋遥感研究。Email:yongzhang@mail.iap.ac.cn。
服务  
把本文推荐给朋友
加入引用管理器
E-mail Alert
RSS
作者相关文章  
张勇
吕达仁

引用本文:

张勇,吕达仁. 一种基于海面背景的WindSat极化通道替代定标方法研究[J]. 遥感技术与应用, 2014, 29(5): 727-734.

Zhang Yong,Lv Daren. Vicarious Calibration of WindSat Polarimetric Channels based Sea Surface Background. Remote Sensing Technology and Application, 2014, 29(5): 727-734.

链接本文:

http://www.rsta.ac.cn/CN/10.11873/j.issn.1004-0323.2014.5.0727        http://www.rsta.ac.cn/CN/Y2014/V29/I5/727

[1]Zhang Yong,Sun Qiang,Lv Daren.Overview of Sea Surface Wind Vector Retrieval Using Fully Polarimetric Microwave Signal[J].Remote Sensing Technology and Application,2013,28(3):533-542.[张勇,孙强,吕达仁.全极化微波信号海面风场反演技术现状与发展趋势[J].遥感技术与应用,2013,28(3):533-542.]

[2]Yueh S H,Nghiem S V,Kwok R,et al.Polarimetric Thermal Emission from Periodic Water Surfaces[J].Radio Science,1994,29(1):87-96.

[3]Yueh S H,Wilson W J,Li F K,et al.Polarimetric Brightness Temperatures of Sea Surfaces Measured with Aircraft K- and Ka-Band Radiometers[J].IEEE Transactions on Geoscience and Remote Sensing,1997,35(5):1177-1187.

[4]Gaiser P W,Germain K St,Twarog E M,et al.The WindSat Spaceborne Polarimetric Microwave Radiometer:Sensor Description and Early Orbit Performance[J].IEEE Transactions on Geoscience and Remote Sensing,2004,42(11):2347-2361.

[5]Yueh S H,Wilson W J,Dinardo S J,et al.Polarimetric Microwave Wind Radiometer Model Function and Retrieval Testing for WindSat[J].IEEE Transactions on Geoscience and Remote Sensing,2006,44(3):584-596.

[6]Skou N,Laursen B.Measurement of Ocean Wind Vector by an Airborne,Imaging Polarimetric Radiometer[J].Radio Science,1998,33(3):669-675.

[7]Piepmeier J R,Gasiewski A J.High-resolution Passive Polarimetric Microwave Mapping of Ocean Surface Wind Vector Fields[J].IEEE Transactions on Geoscience and Remote Sensing,2001,39(3):606-622.

[8]Meissner T,Wentz F J.The Complex Dielectric Constant of Pure and Sea Water from Microwave Satellite Observations[J].IEEE Transactions on Geoscience and Remote Sensing,2004,42(9):1836-1849.

[9]Meissner T,Wentz F J.The Emissivity of the Ocean Surface between 6 and 90 GHz over a Large Range of Wind Speeds and Earth Incidence Angles[J].IEEE Transactions on Geoscience and Remote Sensing,2012,50(8):3004-3026.

[10]Bettenhausen M H,Smith C K,Bevilacqua R M,et al.A Nonlinear Optimization Algorithm for WindSat Wind Vector Retrievals[J].IEEE Transactions on Geoscience and Remote Sensing,2006,44(3):597-610.

[1] 张宜振,韩震,朱情逸,王艺晴,胡旭冉. 不同季节海面风矢量对海表面亮温增益的影响研究[J]. 遥感技术与应用, 2018, 33(2): 331-336.
[2] 高健,王秀珍,许遐祯,陈燕,黄敬峰. 卫星遥感反演海面风矢量数据真实性检验与质量评价[J]. 遥感技术与应用, 2015, 30(3): 439-447.
[3] 陆文, 严卫, 施健康, 任建奇. 一种适用于WindSat的地理定位方法[J]. 遥感技术与应用, 2010, 25(1): 126-131.