Wave extraction with portable high-frequency surface wave radar OSMAR-S |
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Authors: | Hao Zhou Hugh Roarty Biyang Wen |
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Institution: | 1. School of Electronic Information, Wuhan University, Wuhan, 430072, P. R. China 2. Suzhou Institute of Wuhan University, Suzhou, 215123, P. R. China 3. Institute of Marine and Coastal Sciences, Rutgers, The State University of New Jersey, New Brunswick, 08904, USA
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Abstract: | High frequency surface wave radar (HFSWR) has now gained more and more attention in real-time monitoring of sea surface states such as current, waves and wind. Normally a small-aperture antenna array is preferred to a large-aperture one due to the easiness and low cost to set up. However, the large beam-width and the corresponding incorrect division of the first- and second-order Doppler spectral regions often lead to big errors in wave height and period estimations. Therefore, for the HFSWR with a compact cross-loop/monopole antenna (CMA), a new algorithm involving improved beam-forming (BF) and spectral division techniques is proposed. On one hand, the cross-spectrum of the output sequence by the conventional beam-forming (CBF) with all the three elements and the output with only the two loops is used in place of the CMA output self-spectrum to achieve a decreased beam-width; on the other hand, the better null seeking process is included to improve the division accuracy of the first- and second-order regions. The algorithm is used to reprocess the data collected by the portable HFSWR OSMAR-S during the Sailing Competition of the 16th Asian Games held in Shanwei in November 2010, and the improvements of both the correlation coefficients and root-mean-square (RMS) errors between the wave height and period estimations and in situ buoy measurements are obvious. The algorithm has greatly enhanced the capabilities of OSMAR-S in wave measurements. |
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Keywords: | HFSWR wave height wave period in situ comparison beam-forming cross-loop |
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