Sea surface flow inversion method based on X waveband radar image

A radar image, sea surface technology, applied in the reflection/re-radiation of radio waves, radio wave measurement system, use of re-radiation and other directions, can solve the problems of large measurement error, singular value, unstable measurement result, etc.

Active Publication Date: 2012-02-15
哈尔滨哈船导航技术有限公司
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Problems solved by technology

[0019] The current surface flow measurement algorithm has the following shortcomings: ① When the flow rate is low, the error of the measu

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  • Sea surface flow inversion method based on X waveband radar image
  • Sea surface flow inversion method based on X waveband radar image
  • Sea surface flow inversion method based on X waveband radar image

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Embodiment Construction

[0067] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0068] A sea surface current inversion method based on X-band radar images disclosed in the present invention, such as figure 2 As shown, it specifically includes the following steps:

[0069] (1) The radar works in the short-pulse mode, and N consecutive images of sea clutter in the space domain with a continuous acquisition time length of t are used as a sequence (N is calculated according to the continuous sampling time length t and the radar speed, and its value is the continuous sampling time length t is divided by the radar rotation speed and taken as an integer), and then the analysis area is selected to form a sub-image sequence I (3) (x, y, t). In the literature, Zhou Bei's master's thesis, in 2008, in the study of X-band radar sea surface current information extraction technology, it is given that the continuous acquisition time length t should b...

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Abstract

The invention discloses a sea surface flow inversion method based on an X waveband radar image. The method comprises the following steps that: (1), sea clutter images in a time-space domain are collected and are used as a sequence, so that a sub-image sequence is obtained; (2), three-dimensional fourier transform is carried out on the sub-image sequence; (3), a band pass filer is constructed according to a dispersion relation; (4), correction is carried out on a non-linear influence of an image spectrum; (5), a degree of membership is calculated; (6), weighted calculation is carried out; (7),initial flow estimation carried out; (8), iteration flow estimation is carried out. Compared with a current flow inversion algorithm, the sea surface flow inversion method enables a flow inversion accuracy to be improved and especially a flow inversion accuracy at a slow flow speed to be improved; moreover, stability on an inversion result is improved. According to the invention, a dispersion relation band bass filter that depends on a maximum flow speed is utilized to carry out noise filtering on an image spectrum and the denoising capability is strong; besides, correction is carried out on the image spectrum to obtain a sea state spectrum, so that real sea state information can be reflected; and then, the sea state spectrum is utilized as one of weights of a least square method to calculate a flow, so that a flow inversion result approaches a real sea state.

Description

technical field [0001] The invention belongs to the technical field of sea wave parameter inversion, and in particular relates to a sea surface current inversion method based on an X-band radar image. Background technique [0002] Ocean currents are due to the long-term differences in temperature, density, and pressure of seawater between adjacent seas or the long-term effect of directional winds, which cause seawater to flow in a horizontal direction. It has a very close relationship with marine fishery, marine engineering construction, maritime navigation safety and military operations. [0003] When the X-band radar works in the short-pulse mode, the emitted electromagnetic waves meet the micro-scale waves on the sea surface and undergo Bragg scattering, which generates back echoes and is received by the radar receiver to form sea clutter images. Sea clutter images contain a wealth of information about waves and currents. Many domestic units have carried out related rese...

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Application Information

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IPC IPC(8): G01S7/41G01S13/89
Inventor 刘利强贾瑞才戴运桃卢志忠
Owner 哈尔滨哈船导航技术有限公司
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