Up-to-Downwave Asymmetry of the CFOSAT SWIM Fluctuation Spectrum for Wave Direction Ambiguity Removal
نویسندگان
چکیده
The surface wave investigation and monitoring (SWIM) aboard the China-France Oceanography Satellite (CFOSAT), a pioneer conically scanning spectrometer, was successfully launched on October 29, 2018. Its innovative configuration composed of one nadir five rotating near-nadir beams is designed to simultaneously observe directional spectrum at global scale. In this study, we systematically implement spectral analysis radar backscattering with periodogram technique obtain fluctuation for each azimuth direction. 2-D three ( $\theta = 6^\circ $ , 8°, 10°) combines all directions within entire rotation 360°. case study demonstrates that features (peak wavelength direction) are roughly consistent between estimated collocated WaveWatch III slope spectrum. A marked up-to-downwave asymmetry larger level in upwave direction observed. ratio defined [0°, 180°] sector relative [180°, 360°] sector. Statistics display greater than 1 when it denotes smaller down-to-upwave ratio. This observed linked asymmetric modulation from upwind downwind. addition, employ such finding help remove 180° ambiguity practical point view. Preliminary results removal bias 41.3°, 40.6°, 36.7° beams. 10° beam shows slightly better performance compared other two terms standard deviation. shall lay strong basis operational implementation algorithm resolve ambiguity.
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ژورنال
عنوان ژورنال: IEEE Transactions on Geoscience and Remote Sensing
سال: 2022
ISSN: ['0196-2892', '1558-0644']
DOI: https://doi.org/10.1109/tgrs.2021.3086483