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[SCI]Retracking of SARAL/AltiKa Radar Altimetry Waveforms for Optimal Gravity Field Recovery

时间:2017-05-03 来源:未知 点击:
作者:Zhang, SJ (Zhang, Shengjun)[ 1 ] ; Sandwell, DT (Sandwell, David T.)[ 2 ]
MARINE GEODESY
: 40 : 1 : 40-56
DOI: 10.1080/01490419.2016.1265032
出版年: 2017
摘要
The accuracy of the marine gravity field derived from satellite altimetry depends on dense track spacing as well as high range precision. Here, we investigate the range precision that can be achieved using a new shorter wavelength Ka-band altimeter AltiKa aboard the SARAL spacecraft. We agree with a previous study that found that the range precision given in the SARAL/AltiKa Geophysical Data Records is more precise than that of Ku-band altimeter by a factor of two. Moreover, we show that two-pass retracking can further improve the range precision by a factor of 1.7 with respect to the 40 Hz-retracked data (item of range_40 hz) provided in the Geophysical Data Records. The important conclusion is that a dedicated Ka-band altimeter-mapping mission could substantially improve the global accuracy of the marine gravity field with complete coverage and a track spacing of <6 km achievable in similar to 1.3 years. This would reveal thousands of uncharted seamounts on the ocean floor as well as important tectonic features such as microplates and abyssal hill fabric.
关键词
作者关键词:Gravity fieldnoise levelSARAL/AltiKawaveform retracking
KeyWords Plus:SATELLITE ALTIMETRYICE-SHEETERS-1ANOMALIESGEOSAT;PERFORMANCERESOLUTIONCRYOSAT-2COASTALALTIKA
作者信息
通讯作者地址Sandwell, DT (通讯作者)

http://images.webofknowledge.com/WOKRS524B8/images/zh_CN/expand.gif Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92037 USA.
地址:
http://images.webofknowledge.com/WOKRS524B8/images/zh_CN/expand.gif [ 1 ] Wuhan Univ, Sch Geodesy & Geomat, Wuhan, Peoples R China
http://images.webofknowledge.com/WOKRS524B8/images/zh_CN/expand.gif [ 2 ] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92037 USA
电子邮件地址:dsandwell@ucsd.edu
基金资助致谢

基金资助机构 授权号
973 Project of China  2013CB73301 
2013CB73302 
National Natural Science Foundation of China  41210006 
41304003 
project of Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, China  20150209 
National Geospatial-Intelligence Agency  HM0177-13-1-0008 
NASA SWOT program  NNX16AH64G 
查看基金资助信息   
出版商
TAYLOR & FRANCIS INC, 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA
类别 / 分类
研究方向:Geochemistry & Geophysics; Oceanography; Remote Sensing
Web of Science 类别:Geochemistry & Geophysics; Oceanography; Remote Sensing
文献信息
文献类型:Article
语种:English
入藏号: WOS:000396540100003
ISSN: 0149-0419
eISSN: 1521-060X
期刊信息
·  Impact Factor (影响因子): 0.979