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Wave steep function component judgment-based sea wave number spectrum reconstruction method

A wave number spectrum and function technology, applied in the field of ocean wave wave number spectrum reconstruction method, can solve problems such as energy promotion, radar wave detection result error, etc., achieve the effect of being widely applicable and improving the accuracy of ocean wave inversion

Active Publication Date: 2021-02-23
CHINA SHIP DEV & DESIGN CENT
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Problems solved by technology

The measured data show that in sea areas where mixed waves exist, there is often a more obvious energy boost in the low wave number range of the wave number spectrum. to large error

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  • Wave steep function component judgment-based sea wave number spectrum reconstruction method
  • Wave steep function component judgment-based sea wave number spectrum reconstruction method
  • Wave steep function component judgment-based sea wave number spectrum reconstruction method

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with accompanying drawing:

[0040] Please refer to figure 1 , figure 2 , the Doppler spectrum of coherent microwave radar echoes based on measured data can be characterized by a synthetic power spectrum statistical model. Since the radar echo in a certain irradiation area is the comprehensive result of electromagnetic waves reflected by various random sea waves in this area, the echo pulse sequence received by the radar can be regarded as the amplitude and phase of the carrier pulse modulated within the effective time period. . Let the modulation function be A(t), and its corresponding spectrum is the radar echo Doppler spectrum, which is a complex spectrum. Assume that the power spectrum form of the radar ocean echo signal is:

[0041]

[0042] Since the radar echo is always interfered by various noises, the synthetic power spectrum statistical model of the noise and signal in the radar echo ...

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Abstract

The invention discloses a wave steep function component judgment-based sea wave number spectrum reconstruction method. The method comprises the following steps that: each Doppler spectrum is estimatedby adopting a spectral moment method to obtain central frequencies; the obtained central frequency sequence is converted into a speed sequence, primary Fourier transform is performed to obtain a speed spectrum, and the speed spectrum is multiplied by an analytic function to obtain an original sea wave number spectrum; a judgment threshold is determined by adopting a wave steep function componentjudgment criterion, the right side of the judgment threshold of the wave number spectrum is a stormy wave component, and the left side of the judgment threshold is a non-stormy wave component; effective wave height and full-spectrum peak energy P2 are calculated according to a wind speed simulation PM wave number spectrum; if peak energy P1 is smaller than the peak energy P2 of a stormy wave system on the right side of the original spectrum, the non-stormy wave component on the left side of the threshold is replaced with the corresponding part of the Gauss wave number spectrum; and if the PM peak energy P1 is greater than the PM peak energy P2, the non-stormy wave component on the left side of the threshold is replaced with a corresponding part of the PM wave number spectrum. The sea waveinversion precision of a coherent wave-measuring radar can be improved. The method is suitable for shore-based and shipborne microwave Doppler radar systems of various coherent systems.

Description

technical field [0001] The invention belongs to the field of radar signal processing, and in particular relates to a sea wave wave number spectrum reconstruction method based on wave steepness function discrimination Background technique [0002] The ocean covering 71% of the earth's surface is rich in various resources, and all coastal countries in the world are turning their attention to the ocean. In recent years, the United States, Britain, France, Germany and other countries have been working hard to promote the research of shore-based (and ship-borne) radar ocean remote sensing technology to obtain undirected wave spectrum, wave statistics (such as effective wave height, wave period, wave direction), etc. Kinetic elements. [0003] With the development of radio ocean sounding technology, shore-based (and ship-borne) coherent microwave wave-measuring radar has been deeply used in telemetry of ocean wave dynamics parameters. This type of radar obtains the echo Doppler ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88G01S13/95
CPCG01S13/88G01S13/958Y02A90/10
Inventor 陈曦谭辉王硕威陶理奚秀娟
Owner CHINA SHIP DEV & DESIGN CENT
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