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Subband ANMF (Adaptive Normalized Matched Filter) based method for detecting moving object in sea clutter

A technology of moving target detection and sea clutter, applied in the field of physics, can solve the problems of unsuitable multi-pulse accumulation detection, affecting the detection performance of the detector, and the limited number of clutter samples, so as to ensure the invariance of the statistical model and overcome the assumptions Conditional restrictions, the effect of improving detection performance

Inactive Publication Date: 2010-11-17
XIDIAN UNIV
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  • Application Information

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Problems solved by technology

The main deficiency of this patent application is: its implicit condition is that it must be applicable in a spatially stable sea clutter environment, and is affected by the non-stationarity of the speckle component
In practice, the high-resolution sea clutter is spatially non-stationary, which leads to a limited number of clutter samples on adjacent distance units available for this patent application, thus affecting the improvement of the detection performance of the detector
In addition, this patent application is not suitable for multi-pulse accumulation detection

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  • Subband ANMF (Adaptive Normalized Matched Filter) based method for detecting moving object in sea clutter
  • Subband ANMF (Adaptive Normalized Matched Filter) based method for detecting moving object in sea clutter
  • Subband ANMF (Adaptive Normalized Matched Filter) based method for detecting moving object in sea clutter

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Embodiment Construction

[0020] Reference figure 1 , First input the sea surface pulse echo signal received by the radar, for the input radar echo signal x=[x(1), x(2),..., x(N)] T It is composed of N pulse echoes, where the superscript T represents transpose. Echo signal x=[x(1), x(2),..., (N)] T May contain only sea clutter signal c=[c(1), c(2),..., c(N)] T , It may also be the sea clutter signal c=[c(1), c(2),..., c(N)] T And target signal s=[s(1), s(2),...,s(N)] T the mix of. Then the echo signal realizes target detection in sea clutter through the following steps.

[0021] Step 1. The sea surface pulse echo signal x received by the radar passes through the discrete Fourier transform DFT modulation filter bank to realize sub-band decomposition, ensuring the invariance of the statistical model of the sub-band sea clutter.

[0022] Before realizing sub-band decomposition, it is necessary to design a low-pass prototype filter first. Its design should make the linear phase DFT modulation filter bank have h...

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Abstract

The invention provides a subband ANMF (Adaptive Normalized Matched Filter) based method for detecting a moving object in sea clutter, which comprises the following steps of: (1) processing sea surface pulse echo signals received by a radar by a discrete Fourier transform modulated filter bank to realize subband decomposition; (2) carrying out down-sampling extraction on signals subjected to subband decomposition to obtain decomposed and down-sampled subband signals; (3) constructing the detection statistics of all subbands of a subband ANMF detector based on the decomposed and downsampled subband signals, and independently determining the detection threshold of each subband; and (4) comparing the detection statistics of each subband with the detection threshold of a corresponding subband,and judging whether the object exists. The method reduces the non-stationarity of the speckle component of subband sea clutter, overcomes the difficulty of limited available reference samples, eliminates the trouble of limited pre-supposed conditions, and is applicable to moving object detection in various sea conditions.

Description

Technical field [0001] The invention belongs to the field of physics, and particularly relates to a subband-based adaptive normalized matched filter ANMF moving target detection method under the background of sea clutter. Background technique [0002] In the field of target detection, sea clutter is the backscattered echo from the sea surface. Its function is to conceal ship targets and at the same time produce distracting false signals. [0003] At present, the target detection technology under the background of sea clutter mainly includes the detection method of using the average period to realize the small target at sea. For example, the invention patent applied by Beijing University of Aeronautics and Astronautics, the detection method of the small target at sea based on the average period (Patent Application No. 200810247554.6, publication number CN 101452075A). This patent application first extracts the average period of the sea surface echo of each distance unit, uses the d...

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Application Information

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IPC IPC(8): G01S13/04G01S7/41
Inventor 水鹏朗时艳玲
Owner XIDIAN UNIV
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