Sea surface wind field fusion method for SAR (Synthetic Aperture Radar) based on variation

Abstract

The invention discloses a sea surface wind field fusion method for SAR (Synthetic Aperture Radar) based on variation. The method comprises the following steps: firstly, selecting an area with relatively obvious wind stripe characteristics in an SAR image, and analyzing to obtain the wind direction of ocean surface with high precision by adopting a WT (Wavelet Transform) method, so as to obtain a sea surface wind speed by inverting a geophysical model function; secondly, inverting a sea surface wind field in an SAR observation area by using a WRF (Weather Research Forecast) mode wind direction; and finally, optimizing and adjusting a background filed through an observation field by using a variation method by taking the sea surface wind field as an observation field based on wind stripe inversion and taking the sea surface wind field as a background wind field based on wind stripe inversion, so as to obtain a fused sea surface wind field. According to the sea surface wind field fusion method for the SAR based on the variation provided by the invention, the problem that sea surface wind direction inversion depends on the wind stripes can be solved, the inverted sea surface wind direction can be optimized and adjusted by using a variational method, and the integral precision of the inverted regional sea surface wind field can be improved.

Description

technical field [0001] The invention belongs to the technical field of remote sensing, in particular to a variation-based synthetic aperture radar sea surface wind field fusion method. Background technique [0002] SAR (Synthetic Aperture Radar, SAR) has the characteristics of all-time, all-weather and high spatial resolution, and can obtain sea surface wind field with high temporal and spatial resolution. However, the single incident angle mechanism of SAR makes it necessary to obtain the wind direction and then calculate the wind speed when inverting the wind field. There are two ways to obtain wind direction. One is to retrieve wind direction based on SAR image wind stripes. This method can obtain wind direction with high accuracy, but statistics show that there are no obvious wind stripes in nearly 60% of the images for retrieval, so it is difficult Wind stripes are used for wind field inversion in a large area; the other is to use scatterometer or numerical forecast mo...

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Problems solved by technology

At present, the method for SAR sea surface wind field fusion has not been reported. Therefore, it i

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