Significant wave height estimation method and system for Gaofen-3 full-polarization SAR data

A technology with high effective wave height and high score No. 3, which is applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve problems such as low precision and complicated process, and achieve high-precision inversion Effect

Active Publication Date: 2020-12-01
STATE OCEAN TECH CENT
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Problems solved by technology

However, the above method has the problems of complicated process and low precision.

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  • Significant wave height estimation method and system for Gaofen-3 full-polarization SAR data
  • Significant wave height estimation method and system for Gaofen-3 full-polarization SAR data
  • Significant wave height estimation method and system for Gaofen-3 full-polarization SAR data

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Embodiment 1

[0053] see figure 1 , this embodiment provides a method for estimating the effective wave height of the Gaofen-3 full-polarization SAR data, the method comprising:

[0054] Step 101: Obtain a SAR image to be estimated.

[0055] Step 102: Obtain the radar incidence angle of the SAR image to be estimated, which can be read from the incidence.xml file of Gaofen-3 data.

[0056] Step 103: Perform cross-spectrum estimation on the SAR images of the SAR image to be estimated on the three polarization channels VV, HH, and VH respectively, to obtain the real part of the cross-spectrum of the SAR image on each polarization channel VV, HH, and VH, The specific calculation method can be as follows:

[0057] The first step, for example, is to obtain the Doppler (Doppler) spectrum of the SAR single-view complex image on the VV polarization channel of the estimated SAR image, and perform split-view processing to obtain three SAR sub-view images, and then calculate each The wave relative m...

Embodiment 2

[0132] see Figure 5 , this embodiment provides a system for estimating the effective wave height of GF-3 full-polarization SAR data, the system includes:

[0133] The SAR image to be estimated acquisition module 501 is used to acquire the SAR image to be estimated;

[0134] A radar incident angle acquisition module 502, configured to acquire the radar incident angle of the SAR image to be estimated;

[0135] The cross spectrum real part calculation module 503 is used to perform cross spectrum estimation on the SAR images of the SAR image to be estimated on the three polarization channels VV, HH, and VH respectively, to obtain the SAR on each polarization channel of VV, HH, and VH The real part of the cross-spectrum of the image;

[0136] The azimuth cut-off wavelength calculation module 504 is used to calculate the azimuth direction of each polarization channel of VV, HH, and VH according to the real part of the cross spectrum of the SAR image of the SAR image to be estimat...

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Abstract

The invention discloses a significant wave height estimation method and system for Gaofen-3 full-polarization SAR data. The method comprises the following steps: acquiring a radar incident angle of ato-be-estimated SAR image; respectively calculating the cross spectrum real parts of the SAR images of the to-be-estimated SAR image on the three polarization channels VV, HH and VH; respectively calculating the azimuth truncation wavelength of the polarization channels of VV, HH and VH; respectively calculating normalized variances of the SAR images on the polarization channels of VV, HH and VH;inputting the cross spectrum real parts of the SAR images on the polarization channels of VV, HH and VH into the depth residual convolution integral branch of the trained depth residual neural networkmodel; and inputting the radar incident angle, the azimuth truncation wavelength of each polarization channel of VV, HH and VH and the normalized variance of the SAR image on the polarization channels of VV, HH and VH into the full-connection branch of the deep residual neural network model to obtain the sea wave significant wave height corresponding to the to-be-estimated SAR image. The sea wavesignificant wave height estimation method provided by the invention has the advantages of simplicity, convenience, quickness and high precision.

Description

technical field [0001] The invention relates to the field of significant wave height estimation of sea waves, in particular to a method and system for estimating significant wave height of Gaofen-3 full-polarization SAR data. Background technique [0002] Ocean waves are one of the most common ocean phenomena, and they are also an indirect manifestation of ocean disasters such as typhoons and the energy inside the ocean. Accurate observation of significant wave height is of great significance to offshore engineering construction, early warning and forecasting of marine disasters, and guarantee of marine navigation. Compared with the traditional single-point measurement methods such as buoys and ships, the Synthetic Aperture Radar (SAR) remote sensing satellite has become an important Satellite remote sensing ocean wave observation means. [0003] Gaofen-3, which was successfully launched on August 10, 2016, is my country's first C-band SAR satellite. The GF-3 satellite ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S13/95
CPCG01S13/90G01S13/95Y02A90/10
Inventor 王贺李尉尉朱建华
Owner STATE OCEAN TECH CENT
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