High-frequency radar target joint detection method using time-frequency analysis and constant false alarm technology

A radar target and joint detection technology, which is applied in the direction of using re-radiation, measuring devices, radio wave measurement systems, etc., can solve the problem of low detection probability of radar targets, so as to increase the number of target detection, increase the number and probability of detection, and improve the detection rate. effect of ability

Active Publication Date: 2021-01-05
WUHAN UNIV
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Problems solved by technology

[0006] The present invention proposes a high-frequency radar target joint detection method using time-frequency analysis and constant false alarm technology, which is used to solve or at least partly solve the technical problem of low radar target detection probability in the methods of the prior art

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  • High-frequency radar target joint detection method using time-frequency analysis and constant false alarm technology
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  • High-frequency radar target joint detection method using time-frequency analysis and constant false alarm technology

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Embodiment Construction

[0038] The inventors of the present application have found through a large amount of research and practice that traditional constant false alarm technology usually detects ship signals on the range Doppler spectrum, and the Doppler information of moving targets and background clutter are two factors that affect target detection. a key factor.

[0039] The inventors found that in the frequency domain, the superimposition of clutter and interference on the spectral peak of the ship signal will reduce the probability of radar target detection. In the time-frequency domain, clutter and interference will be randomly distributed throughout the time-frequency domain, while the energy of the target signal is concentrated in a limited time and frequency range, which is beneficial to the detection of non-stationary targets and weak targets.

[0040] In order to detect ship targets, high-frequency ground wave radar echo signals have been coherently accumulated for a long time, resulting ...

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Abstract

The invention provides a high-frequency radar target joint detection method using time-frequency analysis and a constant false alarm technology. Firstly, radar echo signals are preprocessed to conveniently extract a time-frequency ridge. The preprocessing process comprises the following steps: performing time-frequency representation on radar echo signals, performing binarization processing, performing vertical projection on a binary image, determining an approximate time-frequency ridge extraction area, and extracting the time-frequency ridge. After the time-frequency ridge is obtained, a CFAR detector is used for carrying out first-stage detection on time-frequency points on the time-frequency ridge, whether the time-frequency points on the time-frequency ridge are target points or not is judged, then the number of the target points is accumulated, second-stage detection is carried out, and if the accumulation number reaches a second threshold value set by a binary accumulation algorithm, it is judged that the time-frequency ridge is a ship target. Verification is carried out through actual radar data and AIS information, and under the condition of the same false alarm rate, a union set of ship targets matched by TF-CFAR and CFAR methods is taken, so that the radar target matching number can be greatly improved, and the radar target detection probability is further improved.

Description

technical field [0001] The invention relates to the technical field of high-frequency ground wave radar sea targets, in particular to a joint detection method for high-frequency radar targets using time-frequency analysis and constant false alarm technology. Background technique [0002] my country is a large oceanic country, with more than 18,000 kilometers of mainland coastline, more than 11,000 islands, and an exclusive economic zone of more than 3 million square kilometers. While the ocean brings us abundant resources, it also brings great challenges in ocean monitoring. An important part of marine monitoring is the monitoring of ships at sea. High-frequency ground-wave radar utilizes the characteristics of small attenuation of vertically polarized electromagnetic waves in the high-frequency band (3-15MHz) along the surface, and can detect moving targets on the sea beyond the horizon. In the echo signal received by the compact high-frequency ground wave radar, in addit...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/04G01S13/87G01S7/02G01S7/41
CPCG01S13/04G01S13/87G01S7/021G01S7/414Y02A90/10
Inventor 周浩杨智清文必洋
Owner WUHAN UNIV
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