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徐曦煜,王振占,叶沛,许可.GPS浮标数据反演海浪谱的理论仿真与试验验证[J].海洋学报,2014,36(7):34-44
GPS浮标数据反演海浪谱的理论仿真与试验验证
Theoretic simulation and campaign validation of ocean wave spectrum retrieval from GPS buoy measurements
投稿时间:2013-07-11  修订日期:2014-04-20
DOI:10.3969/j.issn.0253-4193.2014.04.005
中文关键词:  GPS浮标  随机波面位移  P-M谱  自相关函数  高通滤波
英文关键词:GPS buoy  random wave surface elevation  P-M spectrum  auto-correlation function  high-pass filter
基金项目:中科院国家空间中心重点培育基金(Y32114FB9S)。
作者单位
徐曦煜 中国科学院 空间科学与应用研究中心 微波遥感技术重点实验室, 北京 100190 
王振占 中国科学院 空间科学与应用研究中心 微波遥感技术重点实验室, 北京 100190 
叶沛 中国科学院 空间科学与应用研究中心 微波遥感技术重点实验室, 北京 100190
中国科学院大学, 北京 100039 
许可 中国科学院 空间科学与应用研究中心 微波遥感技术重点实验室, 北京 100190 
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中文摘要:
      GPS浮标作为一种新型的海洋测量设备,近年来在海面高度现场测量和星载高度计定标方面取得了重要应用。通过仿真试验对反演海浪谱的方法和流程进行研究,旨在探索从GPS浮标测量的海面高度序列中提取海浪谱的方法。首先,使用Longuest模型生成了海浪波面位移时间序列,并通过Pierson-Moscowitz风浪谱对波面位移的统计特性进行约束,其随机性由相位引入。结合典型潮汐和GPS浮标仪器噪声的仿真时间序列,合成了仿真时间长度1 h的1 Hz(每秒1次)随机海面高度序列。然后,利用自相关函数法,进行高通滤波和数据压缩,得到了仿真的海浪谱。该仿真结果和理论海浪谱非常接近,可满足海浪谱反演的需求。最后,通过山东石岛外海的GPS浮标现场试验,验证了本文提出的反演方法的适用性。本文的研究解决了GPS浮标反演海浪谱的关键问题,丰富了海浪谱反演的手段,拓展了GPS浮标的应用领域,有望为未来我国的星载波谱仪定标服务。
英文摘要:
      The purpose of this paper was to investigate the method of retrieving ocean wave spectrum from GPS buoy sea surface height time series. GPS buoy,an innovative instrument on ocean topography measurement,played an important role in in-situ sea level measurements and satellite altimetry calibration during past years. This paper demonstrated the method and procedure of wave spectrum retrieval by simulation experiments. Firstly,the wave surface elevation time series were generated based on the Longuest model,and the statistical characteristics were constrained by the Pierson-Moscowitz wind wave spectrum,and the randomicities were introduced from the wave phase. Along with the simulated tide height and GPS buoy instrument noise time series,the 1 Hz (one point per second) random sea surface time series of 1 hour length were synthesized. Afterward,the simulated wave power spectrum was acquired by the auto-correlation function method,containing high-pass filter and compression. The simulated spectrum was pretty close to the theoretic one,and could fulfill the requirements of ocean wave spectrum retrieval. Finally,the retrieving method presented in this paper was validated by the in-situ GPS buoy campaign in the offshore of Shidao,Shandong Province. The study in this paper solved the key issues of the new technology,enriched the approaches of ocean wave spectrum retrieval,explored the application of GPS buoy,and could be served for China's forthcoming satellite radar wavimeter.
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