Sea surface wind speed inversion method based on cross polarization model and CMOD5N

A sea surface wind speed and model technology, applied in the ocean field, can solve the problems that the accuracy of wind speed inversion is greatly affected, and it is difficult to determine the resolution scale of SAR image reconstruction, so as to achieve the effect of improving accuracy

Active Publication Date: 2016-08-24
NANJING UNIV OF INFORMATION SCI & TECH
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Although this method does not rely on external wind direction information and GMF, the accuracy of wind speed retrieval is greatly affected by the resolutio

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  • Sea surface wind speed inversion method based on cross polarization model and CMOD5N
  • Sea surface wind speed inversion method based on cross polarization model and CMOD5N
  • Sea surface wind speed inversion method based on cross polarization model and CMOD5N

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[0030] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention All modifications of the valence form fall within the scope defined by the appended claims of the present application.

[0031] A sea surface wind speed retrieval method based on cross-polarization model and CMOD5N, such as figure 1 As shown, according to the CP model and the C-2PO method, using the VV polarization and VH polarization SAR images, the initial wind speed U 0 and the initial wind direction Φ 0 , according to the initial wind speed U 0 and the initial wind direction Φ 0 Determine the wind field vector (U, Φ), take the wind field vector (U, Φ) as the first guess value, c...

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Abstract

The invention discloses a sea surface wind speed inversion method based on a cross polarization model and CMOD5N. The method comprises the steps of: according to the CP model and a C-2PO method, utilizing VV polarization and VH polarization SRA images to carry out inversion and obtain an initial wind speed U0 and an initial wind direction [phi]0 of a reconstruction resolution unit; determining wind field vectors (U, [phi]) according to the initial wind speed U0 and the initial wind direction [phi]0, using the wind field vectors (U, [phi]) as a first guess value, and utilizing a CMOD5N algorithm to gradually traverse and calculate normalized radar scattering cross sections NRCS of corresponding VV polarization in upper and lower limit ranges of the wind speed and the wind direction with the first guess value serving as a center; and finding out the wind speed and the wind direction which have the smallest differences with the normalized radar scattering cross sections NRCS of VV polarization SRA images, wherein the wind speed and the wind direction having the smallest differences are the wind field vectors obtained by inversion. According to the invention, the wind speed inversion precision of the existing C-2PO method is generally improved in different SAR image reconstruction resolution scale situations.

Description

technical field [0001] The invention relates to a sea surface wind speed inversion method, which belongs to the technical field of oceans. Background technique [0002] Sea surface wind speed retrieval is an important technical means for marine meteorological forecast and marine environment safety monitoring. [0003] At present, the remote sensing technology of sea surface wind field mainly includes scatterometer and synthetic aperture radar (SAR). SAR has a higher spatial resolution than scatterometers, so using SAR image remote sensing to retrieve sea surface wind field vectors has always been an international research hotspot. Document 1, F.Said and H.Johnsen, Ocean surface wind retrieval from dual-polarizedSAR data using the polarization residual Doppler frequency, IEEE Trans. Geosci. Remote Sens. 52(2014) 3980-3990. Document 2, G.K.Carvajal, L.E.B.Erikssonand L.M.H.Ulander, Retrieval and quality assessment of wind velocity vectorson the ocean with C-band SAR, IEEE Tr...

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Application Information

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IPC IPC(8): G01S13/95G01S13/90G01S7/41G01P5/00G01P13/02
CPCG01P5/001G01P13/02G01S7/415G01S13/9029G01S13/95G01S13/9076
Inventor 谢涛何宜军
Owner NANJING UNIV OF INFORMATION SCI & TECH
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