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Wave height measurement in the Taiwan Strait with the portable high frequency surface wave radar OSMAR-S
Received:December 12, 2013  Revised:September 23, 2014
Key words:wave  height, high  frequency surface  wave radar, field  experiment, comparison, Taiwan  Strait
中文关键词:  浪高,高频地波雷达,现场观测,对比,台湾海峡
Author NameAffiliationPostcode
ZHOU Hao* School of Electronic Information,Wuhan University 430072
WEN Biyang School of Electronic Information,Wuhan University 
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      As an important equipment for sea states remote sensing, high frequency surface wave radar (HFSWR) has received more and more attention. The conventional method for wave inversion is based on the ratio of integration of the second-order spectral continuum to that of the first-order region, where the strong external noise and the incorrect allocation of the first- and second-order Doppler spectral regions due to spectral aliasing are two major sources of the big errors in wave height. To account for these factors, two more indexes are introduced to the wave height estimation, i.e. the ratio of the maximum power of the second-order continuum to that of the Bragg spectral region (RSCB) and the ratio of the power of the second harmonic peak to that of the Bragg peak (RSHB). Both of them have a strong correlation with the underlying wave height like the conventional index, based on which two semi-empirical models are proposed to estimate the wave height. Then all the three estimates are combined and smoothed to give the final wave height estimate. This method has been used in the nearly three-month long field experiment of OSMAR-S (Ocean State Measuring and Analyzing Radar, type S), which is a portable HFSWR with compact cross-loop/monopole receive antennas developed by Wuhan University in 2006. The significant wave heights estimated by OSMAR-S coincide well with the data provided by Oceanweather Inc. for comparison, with a correlation coefficient of 0.74 and a root mean square error (RMSE) of 0.77 m. The proposed method has made an effective improvement to the wave height estimation and thus a further step toward operational use of OSMAR-S in wave height extraction.
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