Navigation X-waveband radar ocean wave parameter inversion algorithm based on EOF decomposition

Abstract

The invention relates to a navigation X-waveband radar ocean wave parameter inversion algorithm based on EOF decomposition. The method comprises the following steps: first of all, carrying out EOF decomposition on a navigation X-waveband radar image sequence to obtain different modalities; then by use of a Burg algorithm, obtaining a maximum entropy power spectrum of the main component of a first modality, and according to a spectrum peak value, obtaining a period and a wavelength of ocean waves; by use of a linear relation between a standard deviation of the main component of a modality and an effective wave height, obtaining an effective wave height of the ocean waves; by use of a space function of the first modality and the main component of the first modality, reconstructing a radar image sequence of the first modality of an ocean wave field, performing two-dimensional Fourier transformation on any one image in the sequence, and according to an obtained wave-number spectrum peak value, determining a simulation wave direction; and by use of wave stripe similarities in two adjacent radar images, determining an ocean wave direction. According to the invention, by use of an EOF, the ocean wave field is decomposed into the different modalities, and the wave height, the period, the wavelength and the wave direction of the ocean waves are extracted from major modalities, such that the problem of influences caused by inhomogeneity of the wave field and large noise in case of a low ocean condition is solved.

Description

technical field [0001] The invention belongs to the technical field of marine remote sensing, and relates to a navigation X-band radar sea wave parameter inversion algorithm based on EOF decomposition. Background technique [0002] Waves have an important impact on people's production and life. For example, the construction of near-shore port channels, fishery production, and the navigation of ships in the ocean are closely related to waves. Therefore, ocean wave observation has important practical significance. Traditional observation methods such as buoys can accurately obtain information on changes in ocean waves, but they can only obtain changes in ocean waves at fixed points, and are not easy to manage and maintain. Navigation X-band radar is an all-weather and all-weather high-resolution imaging radar, which can be used to extract information such as wave height, period, wavelength and wave direction of ocean waves from sea clutter images. [0003] Existing methods f...

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Problems solved by technology

[0004] In order to solve the existing technical problems, the purpose of the present invention is to provide a kind of algorithm that can use the navigation X-band radar image sequence to invert the wave parameters of the uniform wave field and the non-uniform wave field under different sea conditions. For this reason, the present invention provides a Inversion Algorithm of Ocean Wave Parameters Based on EOF Decomposition for Navigation X-band Radar

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