A Wave Group Detection Method for Navigation X-band Radar Based on Wave Theory

A technology of wave theory and detection method, applied in radio wave measurement system, radio wave reflection/re-radiation, measurement device, etc., can solve the problem of navigating X-band radar image to obtain local wave height, and achieve a wide range of applications

Active Publication Date: 2019-09-03
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for extracting wave group parameters by using the navigation X-band radar image sequence, so as to solve the problems in the prior art that the navigation X-band radar image can only obtain local wave heights and need experience to select the threshold, which has become the technical field. urgent problems in

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[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] Such as figure 1 As shown, a navigation X-band radar wave group detection method based on wave theory, the implementation process is mainly divided into two parts: the first part is to calibrate the navigation X-band radar image sequence to obtain large-area wave height information, and the second part is to detect The wavefront obtains the wave group parameters.

[0032] Part 1: Calibration of large areas using wave heights measured at single points by buoys

[0033] 1. Select a set of navigation X-band radar image sequences, for example, an image sequence containing 32 images. Decompose the 32 images by empirical orthogonal function, select the first mode, and use its time coefficient W(r,θ) and space function V(r,θ) to reconstruct the wave field:

[0034] Z(r,θ)=V(r,θ)·W(r,θ),

[0035] Among them, r is the distance from the point ...

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Abstract

The invention discloses a navigation X-band radar wave group detection method based on wave theory. First, the navigation X-band radar image sequence is decomposed by empirical orthogonal functions, the main mode is selected to reconstruct the wave field, and the wave field is calibrated to obtain the observed sea area. The displacement of the wave surface at different positions in the center; for a wave surface in a radial direction, the extreme value is detected by the change of the displacement gradient, and the wave height at different positions is obtained according to the difference between two adjacent maximum and minimum values; the difference between the two sine functions And fitting the wave surface between adjacent minimal wave heights, when the fitting parameters are consistent with the wave theory, the area is identified as a wave group; combined with observations at different times, the amplitude, length and group velocity of the wave group can be obtained. The present invention first uses buoys to calibrate the main mode of the wave field to obtain wave height information of a large area in the observed sea area; based on the wave theory, two sinusoidal functions with close frequencies are used to judge the wave group, and the threshold value is not required to be selected empirically, which is simple and easy to implement , a wide range of applications and other advantages.

Description

technical field [0001] The invention belongs to the technical field of marine remote sensing, and relates to a wave group detection method for navigation X-band radar image sequences based on wave theory. Background technique [0002] A wave group is a superposition of a series of simple waves with close frequencies moving in the same direction. Wave groups can excite the resonant frequency of offshore structures, causing serious damage to offshore platforms, breakwaters, and ships. Furthermore, the velocity of wave energy in the ocean is equal to the velocity of the wave group. Therefore, the monitoring of wave groups is of great significance to marine engineering and marine scientific research. [0003] The traditional wave group observation method is to use instruments such as buoys to continuously measure the wave surface at a fixed point, and then analyze the measured values ​​to obtain wave group parameters. The disadvantage of this method is that it can only measur...

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/58G01S13/88G01S7/41
Inventor 陈忠彪何宜军张彪刘保昌
Owner NANJING UNIV OF INFORMATION SCI & TECH
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