Target detection method and device under background of sea clutter based on ground wave radar

Abstract

The invention discloses a target detection method and device under the background of sea clutter based on a ground wave radar, and the method comprises the steps: forming an echo spectrum of the ground wave radar; obtaining synchronous sea state data, building the mapping between the sea state information and the echo scattering of the ground wave radar, and constructing a no-target sea clutter spectrum through combining with the sea state in a radar scattering region and a radar system; extracting a sea clutter spectrum boundary from the echo spectrum of the ground wave radar and the sea clutter sensitive features for target detection; carrying out the abnormal detection of the sea clutter sensitive features and determining a detection threshold value; and outputting a detection result ofa sea clutter target. The device comprises a ground wave radar sea clutter spectrum extraction unit, a no-target echo spectrum reconstruction unit, a threshold generating and target detection unit and a target parameter estimation unit. The invention jumps out of the conventional thinking on clutter inhibition, proposes a strategy for the extraction of a sea clutter boundary and the direct detection. While achieving the detection of an external target of the sea clutter, the invention proposes the direct detection method for the data feature abnormality of ground wave radar, thereby avoidingthe target loss caused by the clutter inhibition.

Description

technical field [0001] The invention relates to a ground wave radar target detection method and device, in particular to a ground wave radar target detection method and device under sea clutter background. Background technique [0002] Ground wave radar has the advantages of long detection distance and all-weather continuous detection in the monitoring of moving targets at sea, and has received more and more attention in the field of monitoring and monitoring of maritime targets. Sea clutter severely restricts the ability of ground wave radar to detect targets. [1] , and even cause the "detection blind spot" of the ship, it is necessary to develop a ship target detection method under the sea clutter background to eliminate the sea clutter detection blind spot and improve the detection performance of ground wave radar sea targets. [0003] For the influence of sea clutter on target detection, most of the current researches use the idea of ​​first clutter suppression and then...

AI Technical Summary

Problems solved by technology

These clutter suppression methods are mainly suitable for target detection outside the sea clutter area, and cannot solve the problem of target detection inside the sea clutter

Aiming at the problem of target detection in sea clutter, Lei Zhiyong et al. [5] Using the envelope correlation of the positive and negative first-order peaks of sea clutter, the target that may fall into the first-order peak of sea clutter is detected by least-mean-square adaptive cancellation. The understanding of the characteristics of the left and right sea clutter will eliminate the target in the sea clutter, resulting in missed detection of the target

At present, when faced with the problem of target detection in the background of sea clutter, there are two types of representative ideas mentioned above. There are many sea clutter suppression methods, but target detection in sea clutter is still a difficult problem to be solved.

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