Method for inverting undirected sea wave spectrum by using multi-frequency high-frequency radar ocean echoes

A wave spectrum, multi-frequency technology, applied in the direction of re-radiation, radio wave reflection/re-radiation, radio wave measurement system, etc., can solve the problems of low accuracy, fixed detection range, performance limited by sea conditions, etc., to achieve The effect of great research and application value

Active Publication Date: 2021-06-18
WUHAN UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems that the traditional single-frequency high-frequency radar inversion of undirected ocean wave spectrum has low accuracy, the performance is limited by the sea state and the detection range is fixed. Undirected Wave Spectrum Method

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  • Method for inverting undirected sea wave spectrum by using multi-frequency high-frequency radar ocean echoes
  • Method for inverting undirected sea wave spectrum by using multi-frequency high-frequency radar ocean echoes
  • Method for inverting undirected sea wave spectrum by using multi-frequency high-frequency radar ocean echoes

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[0068] In order to more clearly illustrate the purpose, technical solutions and beneficial effects of the present invention, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments. It should be understood that particular embodiments of the invention are not limited to the exemplary descriptions herein. as attached figure 1 As shown, the specific steps are as follows:

[0069] A method for inverting undirected ocean wave spectrum by using multi-frequency high-frequency radar ocean echo, comprising the following steps:

[0070] Step 1: According to the distance resolution and angle resolution determined by the single-frequency high-frequency radar parameters, the radar detection area is divided into multiple fan-shaped marine units to be measured at equal intervals and angles.

[0071] Step 2: The original echo data obtained by the single-frequency high-frequency radar is sequentially processed through the first FFT ra...

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Abstract

The invention discloses a method for inverting an undirected sea wave spectrum by using multi-frequency high-frequency radar ocean echoes. The method comprises the following steps of: dividing a fan-shaped to-be-measured ocean unit; extracting a relatively strong side first-order peak of a fan-shaped to-be-measured ocean unit echo Doppler spectrum of a single-frequency high-frequency radar; separating out a corresponding outer second-order spectrum region, and calculating the ratio of the region to the stronger side first-order peak energy; linearizing the outer second-order spectrum region, and obtaining an undirected sea wave spectrum coefficient matrix of the single-frequency radar sea echo; and repeating the steps for different radar transmitting frequencies to obtain an undirected sea wave spectrum coefficient matrix of the multi-frequency radar ocean echo, solving the pseudo-inverse of the undirected sea wave spectrum coefficient matrix through singular value decomposition, and inverting the undirected sea wave spectrum. The method has the advantages that the method can adapt to complex and changeable marine environments with large sea condition changes, the requirement for accurately inverting the undirected wave spectrum under various sea conditions is met, and the problems that the accuracy of inverting the undirected wave spectrum by a traditional single-frequency high-frequency radar is not high, and the performance is limited by the sea conditions are solved.

Description

technical field [0001] The invention belongs to the field of high-frequency radar ocean remote sensing, and in particular relates to a method for retrieving undirected ocean wave spectrum by using multi-frequency high-frequency radar ocean echoes. Background technique [0002] In recent years, high-frequency ground wave radar has been widely used in marine environment monitoring, which has the characteristics of wide detection coverage, all-weather, all-weather and high measurement accuracy. High-frequency ground wave radar interacts with the ocean surface through vertically polarized electromagnetic waves that diffract and propagate along the ocean surface with minimal attenuation to generate Bragg scattering, and obtain echo Doppler spectra that reflect the state of the ocean surface, and then can extract rich ocean parameters. The most important ocean parameters are wave parameters, including wave height, wave period, etc. At present, the extraction of wave height parame...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/41Y02A90/10G01S7/354G01S7/356G01S13/88Y02A90/40
Inventor 赵晨邓敏陈泽宗丁凡李健
Owner WUHAN UNIV
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