| Satellite-based RAR performance simulation for measuring directional ocean wave spectrum based on SAR inversion spectrum |
| |
| 作者姓名： | REN Lin MAO Zhihu HUANG Haiqing GONG Fang |
| |
| 作者单位： | REN Lin(Department of Electromagnetic Fields and Microwave Theory,Nanjing University of Science and Technology,Nanjing 210094,China;State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,State Oceanic Administration,Hangzhou);MAO Zhihua,HUANG Haiqing,GONG Fang(State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China) |
| |
| 基金项目： | The National Natural Science Foundation of China under contract No. 40730843 and the National High Technology Development Program (“863”Program), under contract No. 2007AA12Z182. |
| |
| 摘 要： | Some missions have been carried out to measure wave directional spectrum by synthetic aperture radar (SAR) and airborne real aperture radar (RAR) at a low incidence. Both them have their own advantages and limitations. Scientists hope that SAR and satellite-based RAR can complement each other for the research on wave properties in the future. For this study, the authors aim to simulate the satellite-based RAR system to validate performance for measuring the directional wave spectrum. The principal measurements are introduced and the simulation methods based on the one developed by Hauser are adopted and slightly modified. To enhance the authenticity of input spectrum and the wave spectrum measuring consistency for SAR and satellite-based RAR, the wave height spectrum inversed from Envisat ASAR data by cross spectrum technology is used as the input spectrum of the simulation system. In the process of simulation, the sea surface, backscattering signal, modulation spectrum and the estimated wave height spectrum are simulated in each look direction. Directional wave spectrum are measured based on the simulated observations from 0° to 360°. From the estimated wave spectrum, it has an 180° ambiguity like SAR, but it has no special high wave number cut off in all the direction. Finally, the estimated spectrum is compared with the input one in terms of the dominant wave wavelength, direction and SWH and the results are promising. The simulation shows that satellite-based RAR should be capable of measuring the directional wave properties. Moreover, it indicates satellite-based RAR basically can measure waves that SAR can measure.
|
| 关 键 词： | SAR数据 定向测量 性能仿真 RAR 高光谱 卫星 海浪谱 ENVISAT |
| 收稿时间： | 2/7/2010 12:00:00 AM |
| 修稿时间： | 5/4/2010 12:00:00 AM |
Satellite-based RAR performance simulation for measuring directional ocean wave spectrum based on SAR inversion spectrum |
| |
| REN Lin,MAO Zhihu,HUANG Haiqing,GONG Fang.Satellite-based RAR performance simulation for measuring directional ocean wave spectrum based on SAR inversion spectrum[J].Acta Oceanologica Sinica,2010,29(4):13-20. |
| |
| Authors: | REN Lin MAO Zhihu HUANG Haiqing and GONG Fang |
| |
| Institution: | 1. Department of Electromagnetic Fields and Microwave Theory,Nanjing University of Science and Technology,Nanjing 210094,China;State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China
2. State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China |
| |
| Abstract: | Some missions have been carried out to measure wave directional spectrum by synthetic aperture radar (SAR) and airborne real aperture radar (RAR) at a low incidence. Both them have their own advantages and limitations. Scientists hope that SAR and satellite-based RAR can complement each other for the research on wave properties in the future. For this study, the authors aim to simulate the satellite-based RAR system to validate performance for measuring the directional wave spectrum. The principal measurements are introduced and the simulation methods based on the one developed by Hauser are adopted and slightly modified. To enhance the authenticity of input spectrum and the wave spectrum measuring consistency for SAR and satellite-based RAR, the wave height spectrum inversed from Envisat ASAR data by cross spectrum technology is used as the input spectrum of the simulation system. In the process of simulation, the sea surface, backscattering signal, modulation spectrum and the estimated wave height spectrum are simulated in each look direction. Directional wave spectrum are measured based on the simulated observations from 0° to 360°. From the estimated wave spectrum, it has an 180° ambiguity like SAR, but it has no special high wave number cut off in all the direction. Finally, the estimated spectrum is compared with the input one in terms of the dominant wave wavelength, direction and SWH and the results are promising. The simulation shows that satellite-based RAR should be capable of measuring the directional wave properties. Moreover, it indicates satellite-based RAR basically can measure waves that SAR can measure. |
| |
| Keywords: | satellite-based RAR directional wave spectrum SAR inversion performance simulation |
| 本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录！ |
| 点击此处可从《海洋学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《海洋学报(英文版)》下载免费的PDF全文 |
|
