Ship kelvin wake elevation extraction method based on satellite-borne interference imaging altimeter

Abstract

The invention discloses a ship Kelvin wake elevation extraction method based on a satellite-borne interference imaging altimeter, and the method comprises the steps: 1), obtaining a wake mask image based on two-channel correlation coefficient images of the satellite-borne interference imaging altimeter through Radon transformation and mathematical morphology processing; 2) carrying out interference processing on the two registered channel complex images, and carrying out inversion to obtain elevation images of the sea surface and the wake; 3) performing two-dimensional filtering denoising and mean value removal on the elevation images of the sea surface and the wake to obtain a three-dimensional elevation deviation value of the sea surface and the wake, and multiplying the three-dimensional elevation deviation value with the wake mask image to obtain an initial elevation image of the wake; and 4) carrying out two-dimensional frequency domain processing on the wake initial elevation image, and extracting a ship Kelvin wake elevation image. According to the method, the defect that the Kelvin wake height change cannot be obtained in the existing ship wake monitoring technology is overcome, and a new way for extracting the ship Kelvin wake elevation based on the small-incidence-angle and short-baseline satellite-borne interference imaging altimeter is provided.

Description

technical field [0001] The invention relates to the field of remote sensing image processing technology and interference information extraction technology, especially for small incident angle, short baseline space-borne interferometric imaging altimeters, which can realize the extraction of ship Kelvin wake elevation of such altimeter data products, and specifically relates to a space-based A method for extracting ship Kelvin wake elevations from interferometric imaging altimeters. Background technique [0002] The monitoring of ships moving at sea is one of the important applications of ocean remote sensing, which is of great significance to maritime economic and military activities. The traces left by a moving ship on the water surface are called wakes. Compared with ships, the wake has a larger time and space scale, and the position of the ship can be obtained according to the wake. Therefore, ship wake feature extraction can be used as one of the methods for ship target...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defect that the sea surface height change of the Kelvin wake cannot be obtained in the existing ship wake monitoring technology, and the space-borne interferometric imaging altimeter based on the small incident angle and short baseline can obtain the characteristics of high-precision sea surface elevation, thereby proposing a Extraction Method of Ship Kelvin Wake Elevation Based on Spaceborne Interferometric Imaging Altimeter

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