Method for sea clutter suppression and moving target detection based on FRFT (Fractional Fourier Transform) domain non-coherent accumulation

A non-coherent accumulation and moving target detection technology, applied in the field of moving target detection of sea detection radar, can solve the problems of weakening target energy, false alarm, weak target echo, etc., and achieve suppression of sea clutter and low computational complexity The effect of improving the signal-to-clutter ratio

Active Publication Date: 2011-08-31
NAVAL AVIATION UNIV
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AI Technical Summary

Problems solved by technology

At present, the time-domain clutter map CFAR detection technology mainly has two defects: first, for slow-moving targets, the amplitudes stored in different scan periods are basically the same, and the clutter map is effective in eliminating fixed ground clutter and sea clutter. At the same time, it also greatly weakens the energy of the target; the second is that in the background of strong sea clutter, the target echo is extremely weak, and a large number of peaks of sea clutter cause serious false alarms, resulting in a decline in the detection performance of the time-domain clutter map CFAR

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  • Method for sea clutter suppression and moving target detection based on FRFT (Fractional Fourier Transform) domain non-coherent accumulation
  • Method for sea clutter suppression and moving target detection based on FRFT (Fractional Fourier Transform) domain non-coherent accumulation
  • Method for sea clutter suppression and moving target detection based on FRFT (Fractional Fourier Transform) domain non-coherent accumulation

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specific Embodiment approach 1

[0027] Specific implementation mode 1: sea clutter suppression and moving target detection method based on FRFT domain mean value accumulation

[0028] The following is attached with the manual figure 2 For further detailed description. The specific implementation of the sea clutter suppression and moving target detection method based on FRFT domain mean value accumulation is divided into the following steps:

[0029] (1) The echo signal of the radar antenna is amplified and mixed to obtain zero intermediate frequency data, which is sent to the storage device 1 for preprocessing, so as to obtain the N-dimensional input signal vector x(n) formed by N sampling points at n time =[x(n), x(n-1), ..., x(n-N+1)] T .

[0030] (2) The storage device 2 delays the input signal vector of the storage device 1 by a certain time τ. In order to ensure that the energy of the moving target before and after the cancellation of the clutter map in the FRFT domain is basically not weakened, th...

specific Embodiment approach 2

[0051] Specific implementation mode 2: sea clutter suppression and moving target detection method based on single-pole feedback accumulation in FRFT domain

[0052] The following is attached with the manual image 3 For further detailed description. The specific implementation of the sea clutter suppression and moving target detection method based on single-pole feedback accumulation in the FRFT domain is divided into the following steps:

[0053] (1) The echo signal of the radar antenna is amplified and mixed to obtain zero intermediate frequency data, which is sent to the storage device 1 for preprocessing, so as to obtain the N-dimensional input signal vector x(n) formed by N sampling points at n time =[x(n), x(n-1), ..., x(n-N+1)] T .

[0054] (2) The storage device 3 delays the input signal vector of the storage device 1 by a certain time τ. In order to ensure that the energy of the moving target before and after the cancellation of the clutter map in the FRFT domain ...

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Abstract

The present invention discloses a method for sea clutter suppression and moving target detection based on FRFT domain non-coherent accumulation, and belongs to the field of radar signal processing and detecting technology. A conventional time domain clutter map cancellation technology is difficult to detect a target moving at a low speed, and under the background of strong sea clutter, signal-to-clutter ratio in a target unit is quite low and sea clutter peak is easy to cause false alarm, thus detecting performance is decreased. Therefore, a moving target detecting technology based on the FRFT provided in the invention respectively employs an FRFT domain mean value accumulation method and an FRFT domain simple pole feedback accumulation method to finish the non-coherent accumulation via iterative smoothing of FRFT domain delay data, and the technology carries out cancellation of FRFT domain signal and accumulated data to suppress the sea clutter and improve the signal-to-clutter ratio, with the amplitude of output signal being taken as detection statistics. A detector provided in the invention has an ability to detect a weakly moving target, with no need of the prior information of an optimum transformation angle, and can estimate the motion parameter of the target, being suitable for the condition of low signal-to-clutter ratio, being simple in realization and having popularization and application values.

Description

1. Technical field [0001] The invention belongs to the technical field of radar signal processing and detection, in particular to the moving target detection technology of sea detection radar. 2. Background technology [0002] The detection of weak moving targets in the marine environment is a research hotspot and engineering technical difficulty in ocean detection technology, and it is of great significance in both military and civilian applications. In the detection of weak moving targets in the sea, the radar cross section (Radar Cross Section, RCS) of a moving small ship is very small, and its echo is often submerged in sea clutter and noise. At this time, the traditional CFAR (Constant False Alarm Rate, CFAR) method based on spatial domain processing is adopted, such as Cell Averaging-CFAR (CA-CFAR), Order Statistics CFAR (Order Statistics CFAR, OS-CFAR), etc., use the sampling values ​​of some reference units adjacent to the detection unit to estimate the clutter inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
Inventor 关键陈小龙黄勇何友
Owner NAVAL AVIATION UNIV
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