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Sea clutter suppression method for two-dimensional shipborne high-frequency ground wave radar based on improved oblique projection

A high-frequency ground wave radar and clutter suppression technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of poor sea clutter suppression effect and achieve good sea clutter suppression effect

Active Publication Date: 2017-11-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem that the sea clutter suppression effect of the orthogonal projection algorithm and the oblique projection algorithm is poor, and then proposes a two-dimensional shipborne high-frequency ground wave radar sea clutter suppression method based on the improved oblique projection

Method used

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  • Sea clutter suppression method for two-dimensional shipborne high-frequency ground wave radar based on improved oblique projection
  • Sea clutter suppression method for two-dimensional shipborne high-frequency ground wave radar based on improved oblique projection
  • Sea clutter suppression method for two-dimensional shipborne high-frequency ground wave radar based on improved oblique projection

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specific Embodiment approach 1

[0014] Specific Embodiments 1. In this embodiment, the sea clutter suppression method of two-dimensional shipborne high-frequency ground wave radar based on improved oblique projection is realized according to the following steps:

[0015] Step 1: Perform range transformation and Doppler transformation on the baseband signal data of the high-frequency ground wave radar echo of any antenna element to form range unit data and Doppler unit data;

[0016] Step 2: Using the data obtained in Step 1, perform Doppler domain sea clutter suppression on any range unit and any antenna element;

[0017] Step 3: Use the data obtained in Step 2 to perform oblique projection processing on the antenna element data of any range unit and any Doppler unit to suppress sea clutter.

specific Embodiment approach 2

[0018] Specific embodiment two, this embodiment is different from specific embodiment one, it is characterized in that described step two utilizes the data obtained in step one to perform Doppler domain sea clutter for any distance unit and any antenna array element inhibition;

[0019] For any distance unit r, any antenna element n∈{1 , 2,...,N}, where N represents the largest antenna element label, any Doppler frequency f 0 The sea clutter suppression formula is as follows:

[0020]

[0021] in,

[0022]

[0023] R n =x LPRn x LPRn H (3)

[0024] x LPRn =T H x n (4)

[0025] x n =[x n1 …x nM ] T (5)

[0026] T=[h⊙s t (f -1 ),h⊙s t (f 0 ),h⊙s t (f 1 )] (6)

[0027] the s 0 =T H the s t (f 0 ) (7)

[0028]

[0029] Among them, y in formula (1) n (f 0 ) represents the Doppler frequency f 0 Doppler domain sea clutter suppression results at , where n represents the label of the antenna element, w n is the adaptive weight vector for sea ...

specific Embodiment approach 3

[0030] Specific embodiment three, this embodiment is different from specific embodiment two, it is characterized in that, described step 3 utilizes the data that step two obtains, the antenna array element data of any range unit and any Doppler unit is oblique Projection processing suppresses sea clutter as in formula (9);

[0031] For any range unit r and any Doppler frequency f 0 Oblique projection processing of antenna element data to suppress sea clutter;

[0032]

[0033] in,

[0034] y(f 0 ) = [y 1 (f 0 ),y 2 (f 0 )...y N (f 0 )] T (10)

[0035]

[0036]

[0037] Among them, in formula (9) y(f 0 ) is the sea clutter suppression result of any range unit r in the Doppler domain, w1(f 0 ) is the Doppler frequency f 0 The weight vector of the oblique projection algorithm; in formula (10) y N (f 0 ) represents the Nth antenna element at Doppler frequency f 0 Sea clutter suppression results at , N≥1; set the Doppler frequency f 0 The corresponding fi...

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Abstract

The invention provides a two-dimension high-frequency ground wave radar sea clutter suppression method, belonging to the field of clutter suppression. The problem that the sea clutter suppression effect based on an orthogonal projection algorithm and an inclined projection algorithm is bad, and further a two-dimension boat-carrying high-frequency ground wave radar sea clutter suppression method based on the inclined projection is provided. The method includes that step (1) distance unit data and doppler unit data are formed by performing distance transformation and doppler transformation on the high-frequency ground wave radar echo baseband signal data of any one antenna array element; step (2) by means of the data obtained from step 1, any one distance unit and any one antenna array element are subjected to the doppler domain sea clutter suppression; and step (3) by means of the data obtained from step 2, the inclined projection processing is carried out on the antenna array element data of any one distance unit and any one antenna array to suppress the sea clutter. The method is applicable to the sea clutter suppression.

Description

technical field [0001] The invention relates to the field of clutter suppression, in particular to a two-dimensional shipborne high-frequency ground wave radar sea clutter suppression method based on improved oblique projection. Background technique [0002] The ship-borne high-frequency ground wave radar has the ability of over-the-horizon detection and tracking of sea surface targets and low-altitude targets, and the ship-borne high-frequency ground wave radar can play an early warning role for sea surface targets and low-altitude targets. Shipborne high-frequency ground wave radar is mainly used for coastal monitoring and low-altitude defense, while microwave radar and sky-wave radar are difficult to achieve coastal monitoring and low-altitude defense. [0003] Shipborne high-frequency ground wave radar has better maneuverability and survivability. With the movement of the platform, the first-order sea clutter spectrum broadens significantly. When the platform moves slow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/02G01S7/41
CPCG01S7/023G01S7/414
Inventor 冀振元衣春雷谢俊好袁业术
Owner HARBIN INST OF TECH
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