Journal
REMOTE SENSING
Volume 11, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/rs11091031
Keywords
X-band marine radar; sea surface current; nearshore; cross-spectrum
Categories
Funding
- International Cooperation Project of the National Natural Science Foundation of China [41620104003]
- National Natural Science Youth Foundation of China [41506199]
- National Science Foundation of China for Outstanding Young Scientist [41622604]
- National Key R&D Program of China [2017YFB0502700]
- Russian Science Foundation [17-77-30019]
- Natural Science Youth Foundation of Jiangsu Province [BK20150905]
- Russian Science Foundation [17-77-30019] Funding Source: Russian Science Foundation
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The cross-spectral correlation approach has been used to estimate the wave spectrum from optical and radar images. This work aims to improve the cross-spectral approach to derive current velocity from the X-band marine radar image sequence, and evaluate the application conditions of the method. To reduce the dependency of gray levels on range and azimuth, radar images are preprocessed by the contrast-limited adaptive histogram equalization. Two-dimensional cross-spectral coherence and phase are derived from neighboring X-band marine radar images, and the phases with large coherences are used to estimate the phase velocity and angular frequency of waves, which are first fitted with the theoretical dispersion relation by different least square models, and then the current velocity can be determined. Compared with the current velocities measured by a current meter, the root-mean-square error, correlation coefficient, bias, and relative error are 0.15 m/s. 0.88, -0.05 m/s, and 7.79% for the north-south velocity, and 0.14 m/s, 0.86, 0.06 m/s, and 10.75% for the east-west velocity in the experimental area, respectively. The preprocessing, critical coherence, and the number of images for applying the cross-spectral approach, are discussed.
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