X-waveband wave observation radar ocean current inversion preprocessing method

Abstract

The invention provides an X-waveband wave observation radar ocean current inversion preprocessing method based on the ocean gravity wave dispersion relation. Firstly, a relation expression formula which can meet angular frequency and spatial wave number of the dispersion relation is determined through the ocean gravity wave dispersion relation and a corresponding geometrical relation. Secondly, a series of curved line clusters which can meet the relation formula is determined through the determined angular frequency and the spatial wave number for each direction. The determined curved line clusters are judged to find out curved lines which can meet the dispersion relation. Finally, the determined dispersion relation curved lines are used for carrying out ocean inversion to get accurate ocean current information. The X-waveband wave observation radar ocean current inversion preprocessing method based on the ocean gravity wave dispersion relation is simple in algorithm and high-efficiency and provides the preprocessing method for ocean dynamics parameter inversion of a shore-based X-waveband wave observation radar and a boat-mounted X-waveband wave observation radar and improves accuracy of parameter inversion of ocean currents and ocean waves.

Description

technical field [0001] The invention belongs to the technical fields of radio physics and marine science, and in particular relates to a method for preprocessing X-band wave-measuring radar ocean current inversion by utilizing the dispersion relationship of ocean gravity waves. Background technique [0002] X-band wave measuring radar is widely used in maritime traffic management and maritime navigation, and has gradually developed into a new method for marine environment monitoring in the past 30 years. When the X-band wave measuring radar electromagnetic wave is incident on the sea surface, the capillary waves caused by the wind that are equivalent to the radar wavelength will produce Bragg scattering, and the backscattered echoes will be received by the radar receiver to form "sea clutter", while the wavelength Longer gravitational waves appear on sea clutter images through hydrodynamic modulation, tilt modulation, and shadow modulation on capillary waves. Therefore, X-ba...

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Problems solved by technology

[0004] The traditional ocean current inversion algorithm based on X-band wave measuring radar is based on the weighted least squares method. All frequency points of the spectrum transformed by 3D FFT will participate in the calculation. Due to the interference, the ocean current results will be inaccurate, which will lead to the inversion The obtained wave parameters are not accurate

In order to obtain accurate current information, it is necessary to preprocess the radar data and select a relatively accurate frequency point that satisfies the dispersion relationship. At present, the preprocessing of radar data is limited by the maximum current velocity. However, the maximum possible current in the observed sea area The current velocity is unknown, or for the shipborne X-band wave measuring radar, it will be invalid to use the current velocity to limit the echo spectrum

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