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Method for measuring ocean wave parameter based on sea coherent radar

A technology of coherent radar and ocean waves, which is applied in measuring devices, radio wave measurement systems, and utilizing re-radiation, etc., can solve the problems of low parameter accuracy and high computational complexity of non-coherent radar, and achieve high distance resolution and reduce Computational complexity, high-precision effects

Inactive Publication Date: 2019-04-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of large computational complexity and low accuracy of parameters obtained based on non-coherent radar, and propose a method for measuring sea wave parameters based on marine coherent radar

Method used

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  • Method for measuring ocean wave parameter based on sea coherent radar
  • Method for measuring ocean wave parameter based on sea coherent radar
  • Method for measuring ocean wave parameter based on sea coherent radar

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specific Embodiment approach 1

[0027] Specific implementation mode one: combine figure 1 Describe this embodiment, the specific process of this embodiment is based on the method for measuring sea wave parameters with marine coherent radar:

[0028] Step 1: Using the wave radial velocity to reconstruct the sea surface wave height field;

[0029] Step 2: Select and standardize the sub-images of the reconstructed sea surface wave height field sequence to obtain the reconstructed sea surface wave height field sub-image sequence;

[0030] Step 3: Perform three-dimensional Fourier transform on the sub-image sequence of the reconstructed sea surface wave height field to obtain the three-dimensional ocean wave spectrum;

[0031] Step 4: Combining the empirical relationship, perform high-pass filtering on the three-dimensional ocean wave spectrum to remove noise, and obtain the three-dimensional ocean wave power spectrum after noise removal;

[0032] Step 5: According to the frequency dispersion relationship, per...

specific Embodiment approach 2

[0035] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in the step one, the sea surface wave height field is reconstructed by using the wave radial velocity; the specific process is:

[0036] Step 11. Integrate the radial velocity of a wave in the entire radar observation range at a certain moment in the distance dimension to obtain the velocity potential function

[0037]

[0038] Among them, r min is the radar blind area, u(r,θ,t) is the radial velocity of the sea wave, r is the radial distance, θ is the azimuth, and t is the time;

[0039] Step 12: According to the small-amplitude wave theory and the kinematic boundary conditions of the free sea surface, determine the reconstructed sea surface wave height field as

[0040]

[0041] in, g is the acceleration due to gravity, ω η is the vertical velocity of the water particle on the free surface;

[0042] Assuming that the observed sea surface satisfies the linear ...

specific Embodiment approach 3

[0046] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in the step two, sub-image selection and standardization are carried out on the reconstructed sea surface wave high field sequence, and the reconstructed sea surface wave high field sub image sequence is obtained; the specific process is as follows :

[0047] Because the radar echo is shadowed by high sea waves, the echo will be lost to a certain extent. This phenomenon is called shadow modulation. Shading modulation makes the radial velocity of sea waves farther away from the radar missing or inaccurate, which in turn causes inaccurate reconstruction of sea surface wave height. In order to avoid the influence of shadow modulation and boundary area on the estimation of wave parameters, the following operations should be performed on the reconstructed sea surface wave height field sequence.

[0048] Step 21. Select sub-images for the reconstructed sea surface wav...

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Abstract

The invention provides a method for measuring ocean wave parameters based on sea coherent radar, and relates to a method for measuring ocean wave parameters. The invention aims to solve the problem that the obtained parameter precision is low based on the large calculation complexity of non coherent radar. The method comprises the following steps of: step 1, reconstructing a sea surface wave height field by using the radial velocity of the wave; step 2, performing sub-image selection and standardization on the reconstructed sea surface wave height field sequence; step 3, performing a three-dimensional Fourier transform on the reconstructed sea surface wave height field sub-image sequence to obtain a three-dimensional wave spectrum; step 4, high-pass filtering the three-dimensional wave spectrum to remove noise; step 5, bandpass filtering a three-dimensional wave power spectrum after the noise is removed, again removing the noise, and obtaining a three-dimensional wave spectrum relatedto the ocean wave; step 6, performing frequency dimension integration on the obtained the three-dimensional sea wave spectrum related to the sea waves to obtain a two-dimensional wave direction spectrum; and step 7, obtain the wave parameters according to the two-dimensional wave direction spectrum. The method is used for the field of measuring the sea coherent radar.

Description

technical field [0001] The invention relates to a method for measuring ocean wave parameters. Background technique [0002] The measurement of wave parameters such as surface velocity, wave direction and significant wave height has a vital impact on coastal protection, shipping and offshore industrial operations. Accurate marine environmental monitoring data can provide effective guidance and reference for the above work, so as to ensure the rational exploitation of marine resources and the safety of maritime shipping. [0003] The working frequency of X-band marine radar is 8-12GHz, and the standard working wavelength is 3cm. Compared with single-point measurement equipment such as traditional buoys and gauges, X-band radar has the characteristics of wide monitoring range, low maintenance cost, and high imaging resolution. In view of the above advantages, the development of X-band marine radar in the field of ocean remote sensing is particularly rapid, and it is gradually...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88G01S13/89G01S7/41
CPCG01S7/415G01S13/88G01S13/89
Inventor 谢俊好李美薇姚国伟席堃
Owner HARBIN INST OF TECH
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