Ocean wave characteristic parameter extraction method based on radar echo signal
A technology of radar echoes and characteristic parameters, applied in radio wave measurement systems, instruments, etc., can solve problems such as inability to obtain wave observation systems, poor inversion accuracy of high-precision ocean wave surface parameters, etc.
Active Publication Date: 2019-01-01
NAT UNIV OF DEFENSE TECH
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[0003] The technical problem to be solved by the present invention is that the existing conventional wave observation system cannot obtain high-precision ocean wave surface and the parameter inversion accuracy is poor
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[0062] Such as figure 1 As shown, the method for extracting sea wave characteristic parameters based on radar echo signals disclosed by the present invention comprises the following steps:
[0063] Step 1, preprocessing the received two-way radar echo data to obtain the wave image sequence;
[0064]Step 2: Construct the elevation inversion model based on the wave image sequence based on the principle of interferometric altimetry, and use the relationship between the phase of the target reflected echo signal and the signal transmission distance and the random phase of target scattering to obtain the interferometric phase difference of the radar image sequence, and the interferometric The phase difference is substituted into the altimetry model, and then the phase unwrapping process is performed to obtain the instantaneous wave height of the ocean wave, and the effective wave height information of the ocean wave is obtained by counting the distribution of the local maximum value...
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The invention provides an ocean wave characteristic parameter extraction method based on a radar echo signal. The method comprises the following steps of preprocessing two paths of received radar echodata to obtain an ocean wave image sequence; constructing an elevation inversion model for the ocean wave image sequence, calculating the interference phase difference of a radar image sequence, carrying out phase unwrapping processing to obtain the instantaneous wave height of an ocean wave, and acquiring the effective wave height information of the ocean wave through calculating the distribution of the local maximum value of a two-dimensional wave surface wave height; and carrying out three-dimensional Fourier transform on the instantaneous wave height information of the ocean wave to obtain the wavenumber frequency spectrum of the ocean wave, and according to the dispersion relation of a linear wave theory, acquiring an ocean wave frequency direction spectrum, an ocean wave frequency spectrum and an ocean wave direction distribution function so as to obtain the characteristic parameter of the ocean wave. By using the extraction method, ocean wave characteristic parameter information can be accurately and effectively acquired, and effective means and the method are provided for acquiring the high-precision ocean wave characteristic parameter information.
Description
technical field [0001] The invention relates to a method for processing radar echo signals, in particular to a method for extracting sea wave characteristic parameters based on radar echo signals. Background technique [0002] At present, the use of radar echo signals to obtain ocean wave parameters has been widely used, but conventional wave observation systems have the problems of being unable to obtain high-precision ocean wave surfaces and poor parameter inversion accuracy. Therefore, it is necessary to design an extraction method of sea wave characteristic parameters that can accurately and effectively obtain sea wave characteristic parameter information, and provide effective means and methods for obtaining high-precision sea wave characteristic parameter information. Contents of the invention [0003] The technical problem to be solved by the present invention is that the existing conventional wave observation system cannot obtain high-precision ocean wave surface a...
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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 陈希李妍毛科峰胡冬李振锋朱科澜武海浪萧中乐
Owner NAT UNIV OF DEFENSE TECH