Extraction method of wave propagation direction based on water surface state continuous imaging system

Abstract

The invention relates to an extraction method of the wave propagation direction based on a water surface state continuous imaging system. The extraction method comprises the following steps that (1) detection area wave echoes are collected by using the water surface state continuous imaging system, and the continuously collected echoes are sampled and imaged so that N frames (the general values of N are 32, 64, 128, etc.) of echo image sequences are formed; (2) the collected echo image sequences are preprocessed and the background noise in the images is filtered; (3) optical flow motion estimation is performed on the preprocessed image sequences so that the motion vector set of N frames of echo image sequence pixel points is obtained; (4) the motion speed of all the pixel points in the motion vector set acts as the weight, and weighted averaging is performed on all the pixel point directions so that the overall motion direction of the set of all the pixel points is acquired; and (5) relative coordinate correction is performed on the overall motion direction so that the final wave propagation direction calculation result can be obtained. A new method is provided for extraction of the wave propagation direction based on the water surface state continuous imaging system. Meanwhile, the method is simple and efficient, less in resource occupation, suitable for various types of X-band radar and also suitable for infrared and visible light imaging systems so as to have wide application value.

Description

technical field [0001] The present invention relates to the technical field of radio remote sensing, in particular to the technical field of water surface remote sensing of a water surface state continuous imaging system, and specifically refers to a method for extracting wave propagation directions based on a water surface state continuous imaging system. Background technique [0002] The state of the water surface includes the state of the lake, sea and river. With the development of science and technology and the increase of human interest and demand for new energy and ocean exploration, the remote sensing technology of the state of the lake, river and sea has gradually become a research hotspot for scientists. [0003] At present, the traditional maritime X-band navigation radar is widely used in remote sensing detection of the sea surface. The so-called X-band radar (X Band Radar, abbreviated as XBR) is a general term for fire control and target tracking radars. Next, t...

AI Technical Summary

Problems solved by technology

Due to the inaccuracy of ocean current estimation, this will cause the band-pass filter based on ocean current to fail, which will affect the final frequency direction spectrum

At the same time, due to the existence of shadow modulation, track modulation, hydrodynamic modulation, and tilt modulation, there are differences between the wave image spectrum obtained from radar images and the wave spectrum measured by tools such as in-situ buoys, and the empirical modulation transfer function is used to obtain When adjusting for this difference, the selection of the empirical modulation transfer function itself will also bring errors to the wave direction inversion results

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