Clutter intensity divided self-adaptive dynamic target detection

A moving target detection and adaptive technology, applied in the field of target detection, can solve the problems of loss, influence Doppler calculation, response difference and so on

Active Publication Date: 2013-05-01
CNGC INST NO 206 OF CHINA ARMS IND GRP
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Using the weighted FFT algorithm, in order to obtain a larger ground clutter improvement factor, no matter it is in the clutter area or in the non-clutter area, it needs to be weighted. Most of them are realized by window function, and the signal-to-noise ratio generally ...

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  • Clutter intensity divided self-adaptive dynamic target detection
  • Clutter intensity divided self-adaptive dynamic target detection
  • Clutter intensity divided self-adaptive dynamic target detection

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Embodiment Construction

[0039] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0040] step one:

[0041] For pulse Doppler radar echo data of M times in a coherent processing interval, data arrangement is performed to obtain rearrangement data S cp , the S cp Contains M rows and N columns of data, M is the number of echoes, and N is the number of distance units; the M is the nth power of 2;

[0042] Step two:

[0043] Step 1: For data S cp , take the column as the unit, use M-point FFT to process, and calculate the modulus value, and obtain the range-Doppler plane data X of the auxiliary channel f ; the X f Contains M d xN data, M d is the Doppler channel, which is equal to the number of echoes M in value; select Doppler channels 1, 2, 3, 4, M d -2, M d -1, M d As the ground clutter channel, the remaining Doppler channel is the meteorological clutter channel;

[0044] Step 2:

[0045] Select the maximum value of the ground clutter...

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Abstract

The invention relates to clutter intensity divided self-adaptive dynamic target detection. An M times echo data of pulse Doppler radar in a coherent processing interval is rearranged, the arranged data is divided into primary and secondary channels, wherein the auxiliary channel adopts an FFT (Fast Fourier Transform Algorithm) to process, and an auxiliary channel clutter map is established as the basis of the selection of the primary channel fir filter bank weight coefficient; the primary channel is realized by adopting the fir filter bank; and the number of the weight coefficients of each filter is 4 which respectively correspond to different ground clutter and weather clutter situations, and one of the four weight coefficients is selected as the fir filter weight coefficient of the primary channel according to the auxiliary channel clutter map. The self-adaptive dynamic target detection provided by the invention has the advantages that the primary and secondary channels are adopted to process, the auxiliary channel is processed by adopting FFT, and the primary channel is realized by adopting the fir filter bank; and the auxiliary channel clutter map is established to indicate the current clutter background of the radar, and the weight coefficient of the primary channel fir filter is selected according to the clutter intensity.

Description

technical field [0001] The invention belongs to the technical field of target detection in radar signal processing, and in particular relates to an adaptive moving target detection with clutter strength division. Background technique [0002] Object detection is an essential component of radar signal processing systems. The traditional moving target detection method of pulse Doppler radar mainly includes two methods such as weighted FFT and MTI+weighted FFT. The processing method has a small amount of calculation and is easy to implement. Using the weighted FFT algorithm, in order to obtain a larger ground clutter improvement factor, no matter it is in the clutter area or in the non-clutter area, it needs to be weighted. Most of them are realized by window function, and the signal-to-noise ratio generally has a loss of about 1.5dB. . As for the MTI+FFT method, although the multi-pulse cancellation method can better suppress the influence of ground clutter, it will cause di...

Claims

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Application Information

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IPC IPC(8): G01S7/41
Inventor 袁子乔罗丁利
Owner CNGC INST NO 206 OF CHINA ARMS IND GRP
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