| PENG Hailong,LIN Mingsen.Calibration of HY-2A satellite significant wave heights with in situ observation[J].Acta Oceanologica Sinica,2016,35(3):79-83 |
| 基于现场观测数据的HY-2A卫星有效波高校正研究 |
| Calibration of HY-2A satellite significant wave heights with in situ observation |
| 投稿时间：2015-06-03 修订日期：2015-08-20 |
| DOI：10.1007/s13131-015-0758-9 |
| 中文关键词: 整体最小二乘法 NDBC浮标 HY-2A 雷达高度计 有效波高 |
| 英文关键词:total least squares NDBC buoys HY-2A altimeter significant wave height |
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| 中文摘要: |
| 由雷达高度计回波反演得到的有效波高这个参数是一个没有经过定标校正的原始反演结果。但在如气候研究等应用中精准的定标校正是很重要的。HY-2A卫星高度计自2012年4月开始业务化运行并且开始分发数据,本文采用了一种更加复杂的统计技术——整体最小二乘的方法针对HY-2A卫星雷达高度计有效波高产品进行了校正,与以往的方法有所不同,以前的校正方法一般都认为现场观测的数据精度远远高于卫星反演的结果,因此认为现场观测的数据为真值,误差为零,但对于浮标观测波浪而言,其观测精度误差的数量级与卫星反演结果相当,不能在简单的采用以前的校正方法,本文使用的整体最小二乘方法能够综合考虑两个变量的误差。我们使用该方法给出了HY-2A卫星雷达高度计有效波高产品与美国NDBC浮标的比对校正结果。此外与Jason-2卫星雷达高度计有效波高产品的星星交叉比对校正结果被讨论并给出了结果。 |
| 英文摘要: |
| Significant wave height (SWH) can be computed from the returning waveform of radar altimeter, this parameter is only raw estimates if it does not calibrate. But accurate calibration is important for all applications, especially for climate studies. HY-2a altimeter has been operational since April 2012 and its products are available to the scientific community. In this work, SWH data from HY-2A altimeters are calibrated against in situ buoy data from the National Data Buoy Center (NDBC), Distinguished from previous calibration studies which generally regarded buoy data as "truth", the work of calibration for HY-2A altimeter wave data against in situ buoys was applied a more sophisticated statistical technique-the total least squares (TLS) method which can take into account errors in both variables. We present calibration results for HY-2A radar altimeter measurement of wave height against NDBC buoys. In addition, cross-calibration for HY-2A and Jason -2 wave data are talked over and the result is given. |
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