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Three-dimensional detection method for target in ground wave radar sea clutter

A technology of ground wave radar and three-dimensional detection, which is applied in the direction of radio wave measurement system, radio wave reflection/reradiation, measurement device, etc., can solve the problem of unsatisfactory target detection effect and achieve the effect of improving detection performance

Active Publication Date: 2020-03-31
THE FIRST INST OF OCEANOGRAPHY SOA
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Problems solved by technology

This kind of two-dimensional detection method usually needs to divide the area in practical application, and then adopt different threshold detection methods for different clutter areas and types to achieve better detection performance, but the target detection effect in the sea clutter is still not good. ideal

Method used

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  • Three-dimensional detection method for target in ground wave radar sea clutter
  • Three-dimensional detection method for target in ground wave radar sea clutter
  • Three-dimensional detection method for target in ground wave radar sea clutter

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Embodiment Construction

[0029] Below in conjunction with formula and accompanying drawing, method of the present invention is described further:

[0030] like figure 1 As shown, the first-order echo spectrum extraction method under the strong interference environment using the multi-domain information of high-frequency ground wave radar mainly includes echo spectrum construction and sea clutter area extraction, multi-stage airspace filtering and spectrum synthesis, target detection and parameter estimation , and finally output the detected target range, Doppler and orientation information. The specific steps are as follows:

[0031] Step 1: Using ground wave radar multi-channel down-converted signals with a period of T seconds (the present invention takes 291s as an example), form a channel-distance-Doppler spectrum after matched filtering and coherent accumulation processing. Two-dimensional signal-to-noise ratio method is used to extract the sea clutter area, denoted as x(c,r,f), its physical qua...

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Abstract

The invention discloses a three-dimensional detection method for a target in ground wave radar sea clutter, and the method comprises the steps: constructing a ground wave radar channel-distance-Doppler echo spectrum, extracting a sea clutter region, and constructing a multi-stage spatial domain filter through an oblique projection technology; feeding the ground wave radar channel-distance-Dopplerecho spectrum to each spatial domain filter, taking each direction covered by the ground wave radar by each filter as a potential target direction, and filtering in sequence; and performing synthesisoperation of taking a minimum value on the spectrum data subjected to spatial filtering to obtain a synthesis spectrum, performing three-dimensional detection on a distance-Doppler-azimuth spectrum ofthe synthesis spectrum to suppress non-uniform sea clutters, searching for a peak value, and finally outputting azimuth, distance and Doppler parameters of a ship target. According to the invention,azimuth dimension detection is expanded on the basis of traditional distance-Doppler dimension target two-dimensional detection, azimuth-distance-Doppler dimension target detection is further formed,and the target detection capability in sea clutter is improved by combining echo differences of sea clutter and a target in the three combined dimensions.

Description

technical field [0001] The invention relates to a method for detecting targets in sea clutter of ground wave radar, in particular to a three-dimensional detection method for targets in sea clutter of ground wave radar. Background technique [0002] Ground wave radar is the main means of large-scale, over-the-horizon, and continuous detection of maritime targets. It uses the characteristics of vertically polarized high-frequency electromagnetic waves (3-30MHz) to diffract along the surface to achieve over-the-horizon detection of maritime targets. Ground wave radar sea clutter is the signal scattered back by the high-frequency radio waves emitted by the radar interacting with ocean waves, which can be divided into first-order, second-order and higher-order sea clutter. Among them, the first-order sea clutter appears as a pair of broadened double peaks, with strong energy, causing blind spots for ship detection [1] , reducing the detection rate. Therefore, it is necessary to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/292G01S7/35G01S7/41G01S13/937
CPCG01S7/2927G01S7/354G01S7/414Y02A90/10
Inventor 王祎鸣纪永刚
Owner THE FIRST INST OF OCEANOGRAPHY SOA
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