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Method for inversion of surge wave height by high frequency ground wave radar

A high-frequency ground wave radar and surge technology, which is used in the reflection/re-radiation of radio waves, radio wave measurement systems, and the use of re-radiation, etc., can solve the problems of poor offshore observation accuracy and weak time continuity at fixed points To achieve the effect of improving the observation accuracy

Inactive Publication Date: 2019-05-21
国家海洋局北海预报中心
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Problems solved by technology

Satellite observation means can obtain large-scale swell information, but the continuity of fixed-point time is not strong, and the accuracy of offshore observation is often poor

Method used

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  • Method for inversion of surge wave height by high frequency ground wave radar
  • Method for inversion of surge wave height by high frequency ground wave radar
  • Method for inversion of surge wave height by high frequency ground wave radar

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Embodiment Construction

[0058] The present invention proposes a method for extracting surge wave height through second-order Doppler spectrum inversion of high-frequency ground wave radar echo. The method includes the following steps:

[0059] Step 1: Select the high-frequency ground wave radar echo spectrum used for inversion, and calculate separately for each radar echo spectrum to determine its local noise level at that time.

[0060] The calculation is based on the assumption of white noise. According to the characteristics that the average power spectral density of white noise is equal to the standard deviation:

[0061]

[0062] In the formula, x is the spectral value of the noise, the horizontal bar represents the average value, and N sum is the sample size.

[0063] In the calculation process, the data points of each radar echo spectrum are arranged from small to large, and the noise data is gradually included in the calculation. When the above white noise conditions are met, the noise le...

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Abstract

The invention discloses a method for inversion of a surge wave height by a high frequency ground wave radar. The method comprises the following steps: selecting a high frequency ground wave radar echoDoppler spectrum for inversion and performing independent calculation on each radar echo Doppler spectrum to determine a noise level at a given time and place; with a high-energy Bragg single peak asa reference, carrying out de-ocean-current processing on the radar echo Doppler spectrum; screening out a spectrum capable of carrying out follow-up spectrum shape analysis; identifying a surge spectrum peak in the spectrum; determining an actual measured position of the spectrum peak; carrying out quality checking on the actual measured position of the spectrum peak; carrying out calculation toobtain a surge angle; and calculating the surge wave height. According to the invention, with the high-frequency ground wave radar for observing the surge, a novel way is provided for providing surgeobservation data and the observation precision of the sea surface wave is improved by assisting the way effectively. The method has the important practical and scientific values.

Description

technical field [0001] The invention relates to the field of ocean observation, in particular to a method for retrieving the height of surge waves through high-frequency ground wave radar. Background technique [0002] The effective wave height technology applied to the observation of the overall sea surface wave by high-frequency surface wave radar has been widely used and great achievements have been made. However, in practical applications, it is found that the observation accuracy of the overall significant wave height often fails to meet the requirements for operational use. An important reason for this phenomenon is the presence of irregular swells on the sea surface, which distorts the wave spectrum model on which many traditional inversion models are based. [0003] A swell is a wave generated by a distant storm and travels a certain distance into a local area. The important influence of swell waves on ocean dynamics is attracting more and more attention. For exam...

Claims

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Application Information

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IPC IPC(8): G01S13/95
CPCY02A90/10
Inventor 王炜荔
Owner 国家海洋局北海预报中心
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