| 基于海面多普勒谱模型的海浪反演精度分析 |
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| 引用本文： | 鲍青柳,张有广,林明森,宫鹏.基于海面多普勒谱模型的海浪反演精度分析[J].海洋学报(英文版),2017,36(9):101-107. |
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| 作者姓名： | 鲍青柳 张有广 林明森 宫鹏 |
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| 作者单位： | 国家卫星海洋应用中心, 国家海洋局空间海洋遥感与应用研究重点实验室, 北京 100081;清华大学地球科学中心, 北京 100084,国家卫星海洋应用中心, 国家海洋局空间海洋遥感与应用研究重点实验室, 北京 100081,国家卫星海洋应用中心, 国家海洋局空间海洋遥感与应用研究重点实验室, 北京 100081,清华大学地球科学中心, 北京 100084 |
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| 基金项目： | The National Natural Science Foundation of China under contract No. 41606202; the National Key Research and Development Program of China under contract No. 2016YFC1401002; the Open Fund of Key Laboratory of State Oceanic Administration (SOA) for Space Ocean Remote Sensing and Application under contract No. 201601001. |
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| 摘 要： | Microwave remote sensing is one of the most useful methods for observing the ocean parameters. The Doppler frequency or interferometric phase of the radar echoes can be used for an ocean surface current speed retrieval,which is widely used in spaceborne and airborne radars. While the effect of the ocean currents and waves is interactional. It is impossible to retrieve the ocean surface current speed from Doppler frequency shift directly. In order to study the relationship between the ocean surface current speed and the Doppler frequency shift, a numerical ocean surface Doppler spectrum model is established and validated with a reference. The input parameters of ocean Doppler spectrum include an ocean wave elevation model, a directional distribution function, and wind speed and direction. The suitable ocean wave elevation spectrum and the directional distribution function are selected by comparing the ocean Doppler spectrum in C band with an empirical geophysical model function(CDOP). What is more, the error sensitivities of ocean surface current speed to the wind speed and direction are analyzed. All these simulations are in Ku band. The simulation results show that the ocean surface current speed error is sensitive to the wind speed and direction errors. With VV polarization, the ocean surface current speed error is about 0.15 m/s when the wind speed error is 2 m/s, and the ocean surface current speed error is smaller than 0.3 m/s when the wind direction error is within 20° in the cross wind direction.
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| 关 键 词： | 多普勒谱模型 海洋表面流 参数敏感度分析 测量误差 |
| 收稿时间： | 2016/4/5 0:00:00 |
An ocean current inversion accuracy analysis based on a Doppler spectrum model |
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| BAO Qingliu,ZHANG Youguang,LIN Mingsen and GONG Peng.An ocean current inversion accuracy analysis based on a Doppler spectrum model[J].Acta Oceanologica Sinica,2017,36(9):101-107. |
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| Authors: | BAO Qingliu ZHANG Youguang LIN Mingsen and GONG Peng |
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| Affiliation: | Key Laboratory of State Oceanic Administration for Space Ocean Remote Sensing and Application, National Satellite Ocean Application Service, State Oceanic Administration, Beijing 100081, China;Key Laboratory of Ministry of Education for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing 100084, China,Key Laboratory of State Oceanic Administration for Space Ocean Remote Sensing and Application, National Satellite Ocean Application Service, State Oceanic Administration, Beijing 100081, China,Key Laboratory of State Oceanic Administration for Space Ocean Remote Sensing and Application, National Satellite Ocean Application Service, State Oceanic Administration, Beijing 100081, China and Key Laboratory of Ministry of Education for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing 100084, China |
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| Abstract: | Microwave remote sensing is one of the most useful methods for observing the ocean parameters. The Doppler frequency or interferometric phase of the radar echoes can be used for an ocean surface current speed retrieval, which is widely used in spaceborne and airborne radars. While the effect of the ocean currents and waves is interactional. It is impossible to retrieve the ocean surface current speed from Doppler frequency shift directly. In order to study the relationship between the ocean surface current speed and the Doppler frequency shift, a numerical ocean surface Doppler spectrum model is established and validated with a reference. The input parameters of ocean Doppler spectrum include an ocean wave elevation model, a directional distribution function, and wind speed and direction. The suitable ocean wave elevation spectrum and the directional distribution function are selected by comparing the ocean Doppler spectrum in C band with an empirical geophysical model function (CDOP). What is more, the error sensitivities of ocean surface current speed to the wind speed and direction are analyzed. All these simulations are in Ku band. The simulation results show that the ocean surface current speed error is sensitive to the wind speed and direction errors. With VV polarization, the ocean surface current speed error is about 0.15 m/s when the wind speed error is 2 m/s, and the ocean surface current speed error is smaller than 0.3 m/s when the wind direction error is within 20° in the cross wind direction. |
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| Keywords: | Doppler spectrum model ocean surface current speed parameter sensitivity analysis measurement error |
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