Detection method based on Hough transform domain clutter map for small target in heavy clutter region

A detection method and clutter map technology, applied in the field of pre-detection tracking, can solve the problems of inability to directly detect the target and strong clutter correlation.

Inactive Publication Date: 2015-09-23
THE 724TH RES INST OF CHINA SHIPBUILDING IND
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Problems solved by technology

In the clutter environment with fixed objects such as ground objects, the clutter correlation is strong, and the target cannot be directly detected at this time

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  • Detection method based on Hough transform domain clutter map for small target in heavy clutter region

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Embodiment Construction

[0011] The present invention adopts a detection-before-tracking method based on transform-domain clutter diagrams, and the specific implementation steps are as follows (see attached figure 1 ):

[0012] 1. Set the detection area, primary threshold, transformation parameters, and the number of accumulated frames.

[0013] Pre-detection tracking requires joint processing of multi-frame signals, and multi-frame echoes need to be stored. If pre-detection tracking is performed in all directions, a large amount of storage space and calculation is required. TBD treatment is usually performed on key areas. Therefore, it is first necessary to determine the scope of the detection area. Multi-frame storage is performed for echo signals within the range, and traditional detection and processing are performed for echoes outside the range.

[0014] 2. Echo data preprocessing.

[0015] In order to reduce the amount of computation and the probability of false alarms, this paper uses the t...

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Abstract

The invention relates to a detection method based on a Hough transform domain clutter map for a small target in a heavy clutter region. The detection method is mainly suitable for track-before-detect of the small target in the clutter region with strong correlation between sampling. The detection method utilizes correlation difference of the target at interframe positions through joint processing of multiframe echo signals, and realizes echo amplitude non-inherent accumulation of the target. A plurality of frames of the echo signals at adjacent detection intervals are taken out in sequence and subjected to Hough transformation, so as to construct a clutter map in a transform domain. When refers to newly occurred target echoes, point number of moving trajectory parameters, corresponding to lattices of the clutter map, of the target echoes can be increased. The increased number of echo points in the lattices of the clutter map serves as a bases for detecting the target, and the moving trajectory of the target is inverted through parameters corresponding to the lattices.

Description

technical field [0001] The invention belongs to the field of weak and small target detection in the heavy clutter area, in particular to the pre-detection tracking of the weak and small target in the ground clutter area with strong correlation. Background technique [0002] Track-to-detect (TBD) is a new technique for detection and tracking of weak and small targets. Different from Detect Then Track (DBT), TBD technology does not judge whether the target exists in a single frame, but reduces the radar echo signal by a threshold (including signal strength, coordinate position information, etc.) and stores it. After joint processing of multi-frame data, the detection result is announced and the target track is estimated at the same time. There are many TBD implementation algorithms, including three-dimensional matched filter, multi-stage hypothesis testing, Hough transform, dynamic programming algorithm, maximum likelihood estimation, etc., and the Bayes recursive method base...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S13/66
CPCG01S7/414G01S13/66
Inventor 李纪三黄孝鹏夏永红
Owner THE 724TH RES INST OF CHINA SHIPBUILDING IND
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