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Improved dimension-reduction space-time adaptive processing-based ship-borne high-frequency ground wave radar sea clutter suppression method

A high-frequency ground wave radar, self-adaptive technology, applied to radio wave measurement systems, instruments, etc., can solve problems such as poor clutter suppression effect, large amount of calculation of adaptive processing algorithms, etc., to achieve improved azimuth resolution, good sea Noise suppression effect, effect of improving system degree of freedom

Inactive Publication Date: 2016-03-02
HARBIN INST OF TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of large amount of calculation and poor clutter suppression effect of the prior art adaptive processing algorithm, the present invention further proposes a ship-borne high-frequency ground wave radar based on improved dimensionality reduction space-time adaptive processing IJDL (improved joint domain localized adaptive processing) Sea Clutter Suppression Method

Method used

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  • Improved dimension-reduction space-time adaptive processing-based ship-borne high-frequency ground wave radar sea clutter suppression method
  • Improved dimension-reduction space-time adaptive processing-based ship-borne high-frequency ground wave radar sea clutter suppression method
  • Improved dimension-reduction space-time adaptive processing-based ship-borne high-frequency ground wave radar sea clutter suppression method

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specific Embodiment approach 1

[0024] Specific implementation mode one: the shipborne high-frequency ground wave radar sea clutter suppression method based on the improved space-time adaptive processing of dimension reduction in this embodiment, the specific steps are as follows:

[0025] Step 1, performing range transformation and Doppler transformation on the high-frequency ground wave radar echo baseband signal to form distance unit and Doppler unit data;

[0026] Step 2, using the MUSIC algorithm to perform azimuth processing on any range cell and any Doppler cell data;

[0027] Step 3: Perform dimensionality reduction, space-time adaptive processing on the data processed by the MUSIC algorithm to suppress sea clutter.

[0028] The specific implementation method has beneficial effects:

[0029] In this specific implementation mode, the MUSIC algorithm can be used to realize super-resolution, improve azimuth resolution, and realize sea clutter suppression in azimuth to a certain extent.

specific Embodiment approach 2

[0030] Specific embodiment two: the difference between this embodiment and specific embodiment one is: it is characterized in that described step 2 utilizes the MUSIC algorithm to carry out the steps of azimuth direction processing to any distance unit and any Doppler unit data as follows:

[0031] For any range unit and any Doppler unit, traverse the azimuth angle [0°, 180°], the angle interval is 3°, and calculate the output value P of different azimuth angles MUSIC (φ 0 )

[0032] P M U S I C ( φ 0 ) = 1 | s s ( φ 0 ) H ...

specific Embodiment approach 3

[0034] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that it is characterized in that the noise subspace matrix U is realized by the following steps:

[0035] For any range unit and any Doppler unit, the data d of different antenna elements is defined as

[0036] d=[d 1 , d 2 ,...,d N ] T (1)

[0037] According to the formula (1), the covariance matrix R is obtained 0 for

[0038] R 0 =dd H (2)

[0039] The noise subspace matrix U consists of the covariance matrix R 0 The smallest N in n The eigenvectors of the eigenvalues ​​are formed.

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Abstract

The invention relates to an improved dimension-reduction space-time adaptive processing-based ship-borne high-frequency ground wave radar sea clutter suppression method and belongs to the clutter suppression field. The objective of the invention is to solve the problems of large calculation amount and poor clutter suppression effect of an adaptive processing algorithm in the prior art. The improved dimension-reduction space-time adaptive processing-based ship-borne high-frequency ground wave radar sea clutter suppression method includes the following specific steps that: step one, distance transformation and Doppler transformation are performed on high-frequency ground wave radar echo baseband signals, so that distance unit and Doppler unit data can be formed; step two, azimuth processing is performed on the data of any one distance unit and any one Doppler unit through utilizing the MUSIC algorithm; and step three, dimension-reduction space-time adaptive processing is performed on the data which have been processed by the MUSIC algorithm, so that sea clutter can be suppressed. The improved dimension-reduction space-time adaptive processing-based ship-borne high-frequency ground wave radar sea clutter suppression method of the invention is applied to the clutter suppression field.

Description

technical field [0001] The invention relates to the field of clutter suppression, in particular to a sea clutter suppression method for ship-borne high-frequency ground wave radar based on improved dimensionality reduction space-time adaptive processing. Background technique [0002] The operating frequency of high-frequency ground wave radar is 3-30MHz, which can emit vertically polarized electromagnetic waves, and electromagnetic waves in this frequency band can propagate along the sea surface with relatively small propagation attenuation. The high-frequency ground wave radar has the ability of over-the-horizon detection and tracking of sea targets and low-altitude targets, and can play an early warning role. The main role of shore-based high-frequency ground-wave radar is in coastal monitoring and low-altitude defense, which is also difficult for microwave radar and sky-wave radar to achieve. Vertically polarized transmit antennas are capable of generating surface waves....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 冀振元衣春雷谢俊好袁业术
Owner HARBIN INST OF TECH
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