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Method for X-band radar wave retrieval based on empirical orthogonal decomposition

A technology of empirical orthogonal decomposition and wave inversion, which is applied in the field of X-band radar wave inversion based on empirical orthogonal decomposition, which can solve problems such as wave result error, and achieves low resource occupation, good robustness, and simple and efficient algorithm. Effect

Inactive Publication Date: 2015-10-14
NO 719 RES INST CHINA SHIPBUILDING IND
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Problems solved by technology

At the same time, due to the existence of various interferences, there are always certain errors in the results of ocean waves inverted by using the spectral transformation method

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  • Method for X-band radar wave retrieval based on empirical orthogonal decomposition
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  • Method for X-band radar wave retrieval based on empirical orthogonal decomposition

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[0027] Below in conjunction with accompanying drawing, the present invention is described in further detail, and specific implementation is as follows:

[0028] Such as figure 2 As shown, an X-band radar ocean wave inversion method based on empirical orthogonal decomposition, the specific process is:

[0029] 1. After obtaining the X-band radar echo image, select figure 1 The length and width shown in are L×M bins (L and M are the pixels of the selected X-band radar echo image in the X direction and Y direction respectively), and then the X-band radar at the same position is selected to rotate continuously The N radar echo images obtained by N transformations constitute a matrix with a size of (L×M, N), denoted as L×M=P, and the radar echo for subsequent analysis can be expressed as H(X m ,T n ). Among them, X m =(x, y), m=1~P, represents the coordinates of P space points, n=1~N, represents the time series length is N, T 1 -T n Represents the N radar images obtained by...

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Abstract

The invention provides a method for X-band radar wave retrieval based on empirical orthogonal decomposition. The method includes constructing a covariance matrix by utilizing X-band radar echo data, conducting empirical orthogonal function decomposition on the covariance matrix, obtaining characteristic vector and characteristic root of main mode through determination, establishing a relation between the wave height He, the main modal characteristic root and the average signal to noise ratio SNR of radar echo, fitting by utilizing simulation or actual measurement data to obtain a relation coefficient, establishing a relation between the wave direction Di and phase of the main modal characteristic vector, fitting by utilizing simulation or actual measurement data to obtain a relation coefficient, and carrying out real-time wave parameter retrieval according to the established relation between the wave height and wave direction. The method is complementary to a conventional spectrum analysis retrieval algorithm, and improves the precision for X-band radar wave retrieval.

Description

technical field [0001] The invention belongs to the technical field of radio ocean remote sensing and digital signal processing, and specifically relates to an X-band radar ocean wave inversion method based on empirical orthogonal decomposition, which is mainly suitable for improving the accuracy and reliability of the X-band ocean wave inversion result. Background technique [0002] X-band radar has gradually developed into a new means for marine environment monitoring in the past three decades. When the X-band wave-measuring radar electromagnetic wave is incident on the sea surface, those capillary waves caused by the wind that are equivalent to the radar wavelength produce Bragg scattering, and the backscattered echoes are received by the radar receiver to form "sea clutter", and the wavelength is relatively small. Long gravitational waves appear on sea clutter images through hydrodynamic modulation, tilt modulation, and shadow modulation on capillary waves. Therefore, X-...

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Application Information

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IPC IPC(8): G01S13/89
CPCG01S13/89
Inventor 沈志奔彭亮邓海华董梁王赟
Owner NO 719 RES INST CHINA SHIPBUILDING IND
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