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X-band radar ocean current inversion method based on cross-spectrum analysis

An X-band and cross-spectrum technology, which is applied in the field of X-band radar ocean current inversion based on cross-spectrum analysis, can solve the problems of low observation accuracy of ocean currents and inability to obtain vector flow fields, and achieves the effect of satisfying operational observations.

Active Publication Date: 2019-01-29
NANJING UNIV OF INFORMATION SCI & TECH
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[0010] Purpose of the invention: The present invention provides a simple and easy method of using X-band radar images to invert the sea surface flow field, so as to solve the problem of the low accuracy of X-band radar observation of ocean currents in the prior art and the use of a set of coherent X-band radar The problem that the vector flow field cannot be obtained

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  • X-band radar ocean current inversion method based on cross-spectrum analysis
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  • X-band radar ocean current inversion method based on cross-spectrum analysis

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[0033] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention.

[0034] Such as figure 1 As shown, the present invention provides a method for inversion of X-band radar ocean currents based on cross-spectrum analysis, specifically comprising the following steps:

[0035] Step 1: Select the X-band radar image sequence I, and perform cross-spectrum analysis on two adjacent images to obtain the coherence coefficient

[0036]

[0037] and phase

[0038] Φ ij (k,φ)=arg(S ij), i,j=1,2,...,n (2)

[0039] where I i (x, y) is the intensity value of the radar image, x and y are the abscissa and ordinate of the point in the image, i and j are the sequence of images, n is the number of images, k and Composition of frequen...

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Abstract

The invention provides an X-band radar ocean current inversion method based on cross-spectrum analysis, which comprises the steps of firstly respectively performing cross-spectrum analysis on two adjacent images in an X-band radar image to obtain a coherent coefficient spectrum and a phase spectrum; then respectively averaging the coherent coefficient spectrum and the phase spectrum, determining the number of dominant waves according to the peak value of the coherent coefficient spectrum, and eliminating the direction ambiguity of the dominant wave direction by using the average phase; selecting different wave directions, establishing a mode according to the phase velocity obtained from a frequency dispersion relation, and solving the model according to a least squares method to obtain anocean current vector. The X-band radar ocean current inversion method can solve the problems of low accuracy of the X-band radar in observing sea surface flow field and inability of obtaining the vector flow field by using a set of coherent X-band radar in the prior art, thereby meeting the requirements of business-oriented observation for the coastal marine environment and services for marine production and life and the like.

Description

technical field [0001] The invention belongs to the technical field of ocean remote sensing, and in particular relates to an X-band radar ocean current inversion method based on cross-spectrum analysis. Background technique [0002] The sea surface current field is an important ocean dynamics parameter. It not only affects marine engineering, ship navigation, marine aquaculture and entertainment, but also is closely related to the occurrence and development of marine disasters such as marine oil spill pollution and red tides that have become increasingly serious in recent years. Correlation, so the observation of ocean currents is of great significance. Sea current meters and acoustic Doppler current profilers (ADCP) are widely used in the observation of ocean currents, but they can only obtain point or line ocean current changes, difficult installation and maintenance, and high costs, especially in complex sea areas that people care about Or it may not be usable in extreme...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02G01S13/88
CPCG01S7/02G01S13/88Y02A10/40
Inventor 何宜军陈忠彪张彪
Owner NANJING UNIV OF INFORMATION SCI & TECH
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