Marine target detection method based on power spectrum box dimension

A target detection and power spectrum technology, which is applied in the field of radar signal processing, can solve the problems of detection performance degradation and achieve the effects of overcoming detection performance degradation, improving target detection performance, and improving target signal-to-clutter ratio

Active Publication Date: 2018-03-30
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0004] The technical problem of the present invention is: to overcome the problem of detection performance degradation caused by model mismatch based on the statistical model method, the method starts from the fractal characteristics of sea clutter, and improves the shortcomings of the existing time-d

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  • Marine target detection method based on power spectrum box dimension
  • Marine target detection method based on power spectrum box dimension
  • Marine target detection method based on power spectrum box dimension

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Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] Such as figure 1 As shown, the present invention provides a maritime target detection method based on the dimension of the power spectrum box. Specific steps are as follows:

[0032] (1) Obtain the power spectrum sequence S of sea clutter J range unit echoes j , j∈[1,J], J is the number of range units of the radar echo; specifically:

[0033] (1.1) Obtain the echo time series X of the jth range unit of sea clutter j ={x kj ,k=1,2,3,...,l}, l is the length of sea clutter time series;

[0034] (1.2), according to the sea clutter jth distance unit echo time series X j , using the periodogram method to calculate the sequence X j The power spectrum S j (f), the corresponding discrete sequence is the power spectrum sequence S of the echo of the jth range unit of the sea clutter j , S j (f) The expression is:

[0035]

[0036] A...

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Abstract

The invention discloses a marine target detection method based on the power spectrum box dimension, and belongs to the technical field of radar signal processing. The method includes obtaining a timesequence X of sea clutter echoes, and adopting a periodogram method to calculate a power spectrum S(f) of the sea clutter echoes to obtain a power spectrum sequence S of the sea clutter echoes; performing maximum value normalization processing on the power spectrum sequence S to obtain a normalized power spectrum sequence Su; and setting the grid size delta of the box dimension, calculating the box dimension D of the power spectrum sequence, using the box dimension D as statistics inspection amount to design a nonparametric constant false alarm detector, and completing radar target detection.Detection performance of the method is better than a statistical model-based detection algorithm and an existing time domain fractal dimension detection algorithm, and improves detection performance of a marine target under a low signal to clutter ratio condition.

Description

technical field [0001] The invention relates to a sea target detection method based on power spectrum box dimension. The method is used to improve the performance of target detection under the background of sea clutter, is suitable for early warning radar in the sea working mode, and belongs to the technical field of radar signal processing. Background technique [0002] The traditional target detection method under the background of sea clutter is based on the amplitude statistical distribution model of sea clutter, and the detection scheme and detection threshold factor are determined through the model matching results. The most typical method is the mean constant false alarm detection method (ML- CFAR), including: unit average constant false alarm (CA-CFAR), unit average selected large constant false alarm (GO-CFAR) and unit average selected small constant false alarm (SO-CFAR). Existing literature studies on measured sea clutter data show that sea clutter has nonlinear a...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/414
Inventor 范一飞李渝李财品王伟伟杨晓超黎薇萍李奇
Owner XIAN INSTITUE OF SPACE RADIO TECH
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