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Cone Metrics: A New Tool for the Intercomparison of Scatterometer Records

AuthorsBelmonte, Maria ; Stoffelen, Ad; Verspeek, Jeroen; Verhoef, Anton; Neyt, Xavier; Anderson, Craig
KeywordsRadar signal processing
Antenna radiation pattern
Issue DateMay-2017
PublisherInstitute of Electrical and Electronics Engineers
CitationIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 10(5): 2195-2204 (2017)
AbstractWith an eye on the generation of a long-term climate record of ocean winds, soil moisture, and sea ice extents across the C-band ERS and ASCAT scatterometer spans, a new calibration tool termed cone metrics has been developed. The new method is based on monitoring changes in the location and shape of the surface of maximum density of ocean backscatter measurements, also known as “the wind cone.” The cone metrics technique complements established calibration approaches, such as rain forest and NWP ocean calibration, through the characterization of linear as well as nonlinear beam offsets, the latter via wind cone deformations. Given instrument evolution, proven stability, and the monitoring by transponders, we take ASCAT-A data over 2013 as absolute calibration reference. This paper describes the new method and its application as intercalibration tool in the context of the reprocessing activities for ERS-1 and ERS-2. Cone metrics succeeds at establishing the linear and nonlinear corrections necessary to homogenize the ASCAT and ERS C-band records down to 0.05 dB
Description10 pages, 15 figures, 2 tables
Publisher version (URL)https://dx.doi.org/10.1109/JSTARS.2017.2647842
Identifiersdoi: 10.1109/JSTARS.2017.2647842
issn: 1939-1404
Appears in Collections:(ICM) Artículos
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