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Wave height measurement in the Taiwan Strait with the portable high frequency surface wave radar OSMAR-S
便携式高频地波雷达台湾海峡浪高测量
Received:December 12, 2013  Revised:September 23, 2014
DOI:
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
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliationPostcode
ZHOU Hao School of Electronic Information,Wuhan University 430072
WEN Biyang School of Electronic Information,Wuhan University 
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Abstract:
      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.
中文摘要:
      高频地波雷达作为一种重要的海态遥感设备,已经受到越来越多的关注。强外部噪声和因混叠导致的一阶和二阶谱区的错误划分,是使用基于二阶谱和一阶谱积分之比的传统方法提取浪高时产生较大误差的两个主要因素。针对此问题,在浪高估计中引入了两个新的指标,一是二阶连续谱最大值与一阶谱峰值之比,二是二阶谐振峰与一阶谱峰之比。与传统指标一样,两个新指标与浪高均具有强相关性,基于此提出了两个估计浪高的半经验模式。所有三种模式得到的浪高估计组合在一起并施以平滑给出最终的浪高估计。这种方法应用于高频地波雷达OSMAR-S历时近三个月的现场实验中。该雷达是由武汉大学于2006年开发的便携式高频地波雷达。OSMAR-S测量的有效浪高与作为比对数据的由Oceanweather公司提供的浪高数据之间的相关系数为0.74,方均根误差为0.77m。新提出的方法对浪高估计得到了明显的改善,使OSMAR-S浪高测量的实用化又向前迈进了一步。
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