Noise reduction method of close-range active millimeter wave column scanning imaging system

A technology of scanning imaging and imaging system, which is applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc. It can solve the problems of complex use, limitation, and difficult quantitative expression of signal characteristic information, etc., to suppress noise The effect of weight

Active Publication Date: 2014-03-12
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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Problems solved by technology

Although wavelet transform (WAVELET) can extract the non-stationary features of the signal, it is also linear, and the representation of WAVELET is often non-adaptive. In addition, traditional WAVELET feature extraction methods often use complex and extracted signal feature information Difficult to express quantitatively, which limits its application to some extent

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  • Noise reduction method of close-range active millimeter wave column scanning imaging system
  • Noise reduction method of close-range active millimeter wave column scanning imaging system
  • Noise reduction method of close-range active millimeter wave column scanning imaging system

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[0019] The present invention will be described in detail below in conjunction with the accompanying drawings. The present invention is achieved through the following technical solutions: the noise model of the short-distance active millimeter-wave cylindrical scanning imaging system is introduced into the ICA model to expand the observation data of the imaging system. Blind source separation (BBS) is performed on multi-dimensional noise-added observation signals to obtain useful signals and realize the printing of system noise.

[0020] Such as figure 2 As shown, the noise reduction method of a close-range active millimeter-wave cylindrical scanning imaging system is:

[0021] Step 1: Establish the noise model of the short-range active millimeter-wave cylindrical scanning imaging system. The noise model is composed of internal system noise during system operation, external fixed target interference signals, and interference signals introduced by multipath effects.

[0022] e...

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Abstract

The invention discloses a noise reduction method of a close-range active millimeter wave column scanning imaging system. The noise reduction method comprises the steps of introducing a noise model of the close-range active millimeter wave column scanning imaging system into an independent component analysis (ICA) model to expand the observation data of the imaging system; carrying out blind source separation (BBS) on an observation signal by high-order accumulation to obtain a useful signal and realize the inhibition of system noise, wherein the noise is added into the observation signal in a multi-dimensional way. After the noise reduction method is adopted, the noise component in the imaging system can be effectively inhibited, and the complete information of the useful signal can be maintained.

Description

technical field [0001] The invention relates to a noise reduction method for a short-distance active millimeter-wave cylindrical scanning imaging system. Background technique [0002] With the continuous promotion of short-distance active millimeter-wave cylindrical scanning imaging systems, the noise signal in the imaging system limits the imaging quality of the system and the effective detection of dangerous goods. How to effectively suppress the noise signal in the imaging system has become a short-distance active millimeter The key technology of wave cylindrical scanning imaging. [0003] At present, the noise reduction methods used in the application and related academic papers can be divided into: coherent average method, distance window and background cancellation method, Fourier transform separation method and target feature extraction method based on statistical characteristics. The traditional coherent averaging method requires the mean value of the noise signal t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36G01S13/89
CPCG01S7/021G01S7/36G01S13/89
Inventor 温鑫方维海费鹏年丰
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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