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Sea surface wind field inversion method and device

A wind field inversion and sea surface technology, which is applied in the directions of measurement devices, radio wave reflection/re-radiation, and re-radiation, can solve the problem of large error in wind speed inversion

Inactive Publication Date: 2018-03-02
ZHEJIANG OCEAN UNIV
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Problems solved by technology

[0007] The embodiment of this application proposes a sea surface wind field inversion method and device to solve the wind speed inversion error caused by the existing CMODs algorithm using auxiliary information with low temporal and spatial resolution matched with high-resolution SAR image information for wind field inversion larger technical issues

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  • Sea surface wind field inversion method and device

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Embodiment 1

[0048] figure 1 Shows the schematic diagram of the method for sea surface wind field inversion in Embodiment 1 of the present application, as figure 1 shown, including:

[0049] Step 101: Obtain cross-polarization synthetic aperture radar SAR remote sensing images and ECMWF reanalysis wind field data.

[0050] Step 102: According to the obtained cross-polarization SAR remote sensing image and ECMWF reanalysis wind field data, obtain the normalized backscattering cross-section value NRCS and ECMWF reanalysis wind field data of the cross-polarization SAR remote sensing image based on the radar incident angle Corresponding relationship of wind speed.

[0051] Step 103: Obtain sea surface wind field inversion according to the corresponding relationship.

[0052] In implementation, the NRCS based on the radar incidence angle interval is obtained by radiometrically calibrating the cross-polarization SAR remote sensing images, which include VH polarization and HV polarization SAR ...

Embodiment 2

[0064] figure 2 Shows the flow chart of the method for sea surface wind field inversion in Embodiment 2 of the present application, as figure 2 as shown,

[0065] The present invention realizes sea surface wind field inversion from low wind speed to high wind speed based on Sentinel-1 SAR cross polarization, that is, VH polarization and HV polarization, such as figure 2 As shown, the method includes:

[0066] 201: Obtain original spaceborne SAR images and ECMWF reanalysis wind field data.

[0067] Collect 328 Sentinel-1GRD SM mode SAR remote sensing images, each image has a single pixel width of 10 meters, and there are very few images caused by other ocean phenomena such as upwelling, rainfall or oil slicks in the collected SAR remote sensing images out of shape. At the same time, ECMWF reanalysis wind field data with a time interval of 6 hours and a resolution of 0.125°×0.125°, or about 12.5km×12.5km, were collected. When matching the ECMWF reanalysis wind field data...

Embodiment 3

[0096] Figure 6 Shows the device structure diagram of the inversion of the sea surface wind field in the third embodiment of the present application, as Figure 6 As shown, the device may include an acquisition module 601 , a matching module 602 , an inversion module 603 and a verification module 604 .

[0097] The acquiring module 601 is configured to acquire cross-polarization synthetic aperture radar SAR remote sensing images and ECMWF reanalysis wind field data, and the cross-polarization SAR remote sensing images include NDBC buoys of the US National Aids to Navigation Data Center.

[0098] The matching module 602 is used to reanalyze the wind field data according to the obtained cross-polarization SAR remote sensing image and ECMWF, and obtain the normalized backscattering cross-section value NRCS and ECMWF reanalysis of the cross-polarization SAR remote sensing image based on the radar incident angle Correspondence of wind speed in wind field data.

[0099] The inver...

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Abstract

The invention provides a sea surface wind field inversion method and device and belongs to the technical field of a synthetic aperture radar. The method comprises steps that a cross polarization synthetic aperture radar (SAR) remote sensing image and European medium and long term weather forecast center (ECNWF) re-analysis wind field data are acquired; according to the acquired cross polarizationSAR remote sensing image and the ECNWF re-analysis wind field data, the corresponding relationship between a normalization backward scattering cross section value NRCS of the cross polarization SAR remote sensing image based on a radar incidence angle and the wind speed of the ECNWF re-analysis wind field data is acquired; sea surface wind field inversion is acquired according to the correspondingrelationship. The method is advantaged in that sea surface wind field inversion can be carried out without the auxiliary wind direction information, and sea surface wind field inversion of the synthetic aperture radar remote sensing image based on the cross polarization mode is realized.

Description

technical field [0001] The present application relates to the technical field of synthetic aperture radar, in particular to a sea surface wind field inversion method and device. Background technique [0002] The global ocean area accounts for 71% of the earth's surface area and is an important part of global climate change. The sea surface wind speed and direction are one of the important elements of the ocean and atmosphere, and are the main driving force for the movement of the upper ocean. For marine environmental dynamics, the sea surface wind field is not only the direct driving force of sea surface waves, but also the driving force of regional and global ocean circulation. At the same time, the sea surface wind field regulates the air-sea interaction and plays an important role in global climate change. In addition, the sea surface wind field also directly affects marine operations such as marine engineering, marine fishery and maritime shipping. [0003] The 21st ce...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S13/95
CPCG01S13/90G01S13/95G01S13/9027G01S13/9076
Inventor 邵伟增李欢孙展凤
Owner ZHEJIANG OCEAN UNIV
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