基于RADARSAT-2雷達數據的海面風速反演方法研究
[Abstract]:With the increasing consumption of traditional energy in society, the renewable resources such as solar energy and wind energy have great application prospects. The offshore wind energy resources in China are very rich and will become one of the important directions in the transformation of resources in China. The relationship between the backscattering coefficient and the wind vector of the sea surface wind vector is obtained, and the data of the sea surface wind field can be obtained quickly. It can provide the high spatial resolution of the sea surface wind field data for the exploitation and utilization of the offshore wind energy resources. This paper uses the principle of the sea surface wind field inversion based on the high spatial resolution synthetic aperture radar, and uses the C band backscatter system. The geophysical model function (GMF) and the C band cross polarization sea surface scattering model (C-2PO) are constructed by the empirical relationship between NRCS and the wind vector. The 12 views of RADARSAT-2 satellite data, which are characterized by multi polarization, multiple imaging modes and high spatial resolution, are used to invert the sea surface wind velocity in the eastern area of China. Using the measured data of buoy provided by NOAA to verify and analyze the data of ERA-Interim (Interim Reanalysis) reanalysis of wind field, the results show that the root mean square error of wind speed and wind direction of ERA-Interim data is 0.98m/s and 12.79 degrees respectively, and the fitting degree is better with the measured data of buoys, which shows high accuracy and is determined as credible data, so ERA-I is selected. Nterim wind field data is used as RADARSAT-2 radar data to inverse the initial wind direction data of sea surface wind speed and wind speed verification data,.RADARSAT-2 radar data have the characteristics of multi polarization. In this paper, the corresponding model is used to inverse the sea surface wind velocity according to the radar data of different polarization modes. For the VV polarization data of RADARSAT-2, respectively. Three main mainstream C band geophysical model functions (CMOD4, CMOD5 and CMOD-IRF2) are used to retrieve the sea surface wind speed. The results show that the velocity accuracy of the VV polarization data is the highest with the CMOD4 model, and the mean square root error is 1.27m/s, which can be used for the inversion of the wind velocity of the RADARSAT-2 data. For the HH polarization data, three kinds of normal data are compared and analyzed. On the basis of the polarization ratio model (Bragg model, Thompson model and Kirchhoff model), three GMF models are used for wind velocity inversion respectively. The results show that the use of the Kirchhoff polarization ratio model is more suitable for the inversion of the sea surface wind velocity of the RADARSAT-2HH polarization data, while the three kinds of GMF models have little difference in wind speed and the root mean square error. Within 2m/s, for VH and HV polarization data, this paper uses fine full polarimetric data to study, uses the C band cross polarization sea surface wind velocity inversion model (C-2PO model) to retrieve the sea surface wind speed, and uses GMF model to inverse the corresponding sea surface wind velocity of the corresponding VV and HH polarization data, and carries out the results with the ERA-Interim data. The results show that the inversion accuracy of VH and HV polarization data is basically the same, all of which can reverse the high precision of the sea surface wind speed, the average deviation is about 1m/s, the mean square root error is within 1.5m/s, and the inversion effect is better than the same polarization data. At the same time, the backscattering coefficient of the ScanSAR mode cross polarization data is also with the sea surface wind. The results of the sea surface wind velocity inversion of the integrated RADARSAT-2 data show that both the same polarization and cross polarization data can obtain higher precision of the sea surface wind speed, in which the VH and HV polarization data of the fine and full polarization mode can be used directly by C- without the need of external wind direction data. The 2PO model performs sea surface wind velocity inversion, and its inversion results are better than the VV and HH polarizing data using the GMF model. The fully polarized cross polarization data shows a more significant advantage over the sea surface wind velocity inversion, and will be the direction of the future sea surface wind velocity inversion.
【學位授予單位】:浙江大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:P714.2;P715.7
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