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

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

Inactive Publication Date: 2013-02-13
XIDIAN UNIV
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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

Method used

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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] refer to 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 is composed of N pulse echoes, where the superscript T represents transposition. Echo signal x=[x(1), x(2),..., (N)] T may contain only sea clutter signals c=[c(1), c(2), ..., c(N)] T , it may also be the sea clutter signal c=[c(1), c(2),..., c(N)] T with the target signal s = [s(1), s(2), ..., s(N)] T the mix of. The echo signal then goes through the following steps to achieve target detection in sea clutter.

[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 the sub-band decomposition, which ensures the invariance of the statistical model of the sub-band sea clutter.

[0022] Before realizing the sub-band decomposition, it is necessary to design the low-pass prototype filter earlier, and its design should make...

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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 in particular 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 of the sea surface, and its function is to cover up the ship's target and generate distracting false signals at the same time. [0003] At present, the target detection technology under the background of sea clutter mainly includes the detection method of small targets at sea by using the average period. CN 101452075A). The patent application first extracts the average period of the sea surface echo of each distance unit, uses the distance unit adjacent to the distance unit to be detected to calculate the detection threshold, and compares the threshold value with the average period extracted by the distance unit to be detected to obtain the detection resu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/04G01S7/41
Inventor 水鹏朗时艳玲
Owner XIDIAN UNIV
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