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Swath-based cross-polarized SAR wind field inversion method

A technology of cross-polarization and wind field inversion, which is applied in the directions of radio wave reflection/re-radiation, re-radiation, and measurement devices, which can solve problems such as wind speed errors, and achieve strong operability and high wind speed inversion accuracy , strong practical effect

Active Publication Date: 2018-12-11
ZHEJIANG UNIV
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Problems solved by technology

However, the wind speed retrieved by this model in the third sub-swath of the IW mode VH polarization image has a large error, the RMSE is 2.69m / s, and the correlation coefficient is 0.43

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  • Swath-based cross-polarized SAR wind field inversion method
  • Swath-based cross-polarized SAR wind field inversion method
  • Swath-based cross-polarized SAR wind field inversion method

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0037] Such as figure 1 Shown: the present invention is a kind of cross-polarization SAR wind field inversion method based on swath width, and concrete computing method comprises the following steps:

[0038] Step 1. Obtain the Sentinel-1 interferometric wide-range SAR image data, which includes co-polarized SAR images and cross-polarized SAR images, and preprocess the co-polarized SAR images and cross-polarized SAR images respectively, Obtain co-polarization backscatter coefficient (NRCS) images and cross-polarization backscatter coefficient (NRCS) images;

[0039] Specifically, to obtain SAR images that include co-polarization and cross-polarization at the same time, at present, many synthetic aperture radars carried by satellites have multi-polarization imaging methods, such as the recently launched Sentinel of the European Space Agency, which can provide a...

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Abstract

The invention discloses a swath-based cross-polarized SAR wind field inversion method comprising: acquiring Sentinel-1 interference wide SAR image data, performing preprocessing, obtaining a co-polarized backscatter coefficient image and a cross-polarized backscatter coefficient image; in combination with external wind field data, performing sea surface wind field inversion to obtain co-polarizedwind field data; calculating the noise equivalent scatter coefficient of the cross-polarized SAR image, and subtracting the noise equivalent scatter coefficient from the cross-polarized backscatter coefficient image; dividing the image into three swaths including a first swath, a second swath and a third swath, establishing a quadratic function of the first, second, and third swaths, and then calculating the cross-polarized inversion wind speed. The method of the invention is simple in calculation, good in operability and high in computational efficiency, can obtain the sea surface wind fieldby inversion just by the cross-polarized SAR backscatter coefficient and platform noise data, and is high in wind field inversion precision.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar data processing, in particular to a swath-based cross-polarization SAR wind field inversion method. Background technique [0002] Sea surface wind is the power source of ocean movement, an important factor affecting elements such as waves, ocean currents, and water masses, and directly participates in regulating the exchange of water vapor, heat, and matter between the atmosphere and the ocean, and plays a pivotal role in regional and global climate systems role. Sea surface wind field data provide necessary information for offshore fishery, marine transportation, construction of offshore wind farms, construction of offshore oil exploration platforms, and monitoring of El Niño phenomena. [0003] With the development of remote sensing technology, the use of microwave sensors to measure wind has become an important means of obtaining sea surface wind field. Radiometers and scatte...

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Application Information

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IPC IPC(8): G01S13/90G01P5/00G01P13/02
CPCG01P5/00G01P13/02G01S13/904G01S13/9023G01S13/9076
Inventor 张康宇黄敬峰郭乔影
Owner ZHEJIANG UNIV
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