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Method for detecting water depth of offshore sea by X-band radar

A technology of X-band and detection area, which is applied in the field of using X-band radar to detect the water depth of offshore waters, and achieves the effects of less resource occupation, real-time refined observation, and simple calculation method.

Inactive Publication Date: 2013-09-11
WUHAN UNIV
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Problems solved by technology

[0003] So far, there is no technology to use X-band radar to detect the depth of the ocean

Method used

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  • Method for detecting water depth of offshore sea by X-band radar
  • Method for detecting water depth of offshore sea by X-band radar
  • Method for detecting water depth of offshore sea by X-band radar

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Embodiment

[0027] 1. Input parameters.

[0028] The present invention needs to use the X-band radar to collect the sea surface echo map in the detection area, and save the collected echo image sequence as a three-dimensional image sequence g(x, y, t). The present invention first divides the X-band radar detection area into each small area for the processing of subsequent algorithms, such as: the selected area size of setting is L x * L y m, that is, the X-axis direction is at least divided into N x Equal parts, the resolution is Δx meters; the least division in the Y axis direction is N y The division, that is, the resolution, is also Δy meters. Finally, the water depth information of each small area can be integrated to form the water depth information of all areas detected by the radar. The number of analyzed radar image sequences is selected as N, and considering the time of each frame of image imaging (that is, the time Δt for the radar antenna to make a circle), the time period...

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Abstract

The invention relates to a method for detecting the water depth of an offshore sea by an X-band radar. The method includes the steps: acquiring sea surface echograms of a detection zone by the aid of the X-band radar, and performing three-dimensional FFT (fast Fourier transformation) for the acquired N echo image sequences to obtain transformed image spectra; filtering the image spectra by the aid of corresponding filter technique and separating a signal from noise; transforming the filtered image spectra into two-dimensional wave number spectra under a wave number coordinate (kx, ky) at a fixed frequency; transforming the two-dimensional wave number spectra into sea wave spectra of a frequency area by the aid of two-dimensional inverse FFT and an MTF (modulation transfer function); calculating a wave number corresponding to a single component spectrogram at the fixed frequency; and extracting a water depth information graph from three-dimensional spectra by inverting the water depth according to a sea surface gravity wave dispersion relation. A new method for detecting the water depth is provided, water depth measuring resolution ratio is high, water depth sea graphs of all seas in an area detected by the X-band radar can be formed, and results are straightforward.

Description

technical field [0001] The invention relates to a method for detecting the depth of the offshore sea area by using a radar, in particular to a method for detecting the water depth of the offshore sea area by using an X-band radar. Background technique [0002] X-band shore-based radar and marine radar are widely used in maritime traffic management and maritime navigation, and have gradually developed into a new means for marine environment monitoring in the past three decades. In order to use X-band radar to obtain information such as the wave field, it is necessary to study the echoes that generate the backscatter of radar signals. Since the sea surface is a dynamic and constantly changing plane for radar, the understanding of radar echoes not only requires a suitable model to describe the scattering characteristics of the sea surface, but also requires an in-depth understanding of the complex motion of the ocean. For the X-band radar, the incident electromagnetic wave on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S13/89G01C13/00
Inventor 吴雄斌王立马克涛陈骁锋
Owner WUHAN UNIV
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