Detection of extremely weak NQR signals using stochastic resonance and neural network theories

TY - JOUR

T1 - Detection of extremely weak NQR signals using stochastic resonance and neural network theories

AU - Shao, Weihang

AU - Barras, Jamie

AU - Kosmas, Panagiotis

PY - 2017/7/12

Y1 - 2017/7/12

N2 - Nuclear Quadrupole Resonance (NQR) signal detection is widely used for searching related substances of interest, such as explosives, petroleum, drugs, etc. NQR responses from these substances are usually very weak compared to background noise. Moreover, in some applications such as landmine detection, NQR responses decay with time quickly, and the required scanning times are usually prohibitively long. This paper presents a novel approach which can detect NQR signals of very low SNRs in such scenarios, by combining a stochastic resonance framework and neural network theory. Firstly, the approach relies on the design of a stochastic resonance (SR) system which can transform the original data into a nonlinear waveform with special SR features. Secondly, a (feedforward) robust neural network is trained to discern this nonlinear waveform accurately, in order to identify the NQR signal. Our results demonstrate that the neural network approach outer-performs traditional signal processing detection and estimation methods. Moreover, this stochastic resonance neural network approach (SRNN) can be designed to detect a variety of NQR signals which have similar NQR parameters but not identical resonant bands. The SRNN approach can also be effective in cases where both noise and radio frequency interference are strong relative to the NQR response.

AB - Nuclear Quadrupole Resonance (NQR) signal detection is widely used for searching related substances of interest, such as explosives, petroleum, drugs, etc. NQR responses from these substances are usually very weak compared to background noise. Moreover, in some applications such as landmine detection, NQR responses decay with time quickly, and the required scanning times are usually prohibitively long. This paper presents a novel approach which can detect NQR signals of very low SNRs in such scenarios, by combining a stochastic resonance framework and neural network theory. Firstly, the approach relies on the design of a stochastic resonance (SR) system which can transform the original data into a nonlinear waveform with special SR features. Secondly, a (feedforward) robust neural network is trained to discern this nonlinear waveform accurately, in order to identify the NQR signal. Our results demonstrate that the neural network approach outer-performs traditional signal processing detection and estimation methods. Moreover, this stochastic resonance neural network approach (SRNN) can be designed to detect a variety of NQR signals which have similar NQR parameters but not identical resonant bands. The SRNN approach can also be effective in cases where both noise and radio frequency interference are strong relative to the NQR response.

U2 - 10.1016/j.sigpro.2017.06.027

DO - 10.1016/j.sigpro.2017.06.027

M3 - Article

SN - 0165-1684

VL - 142

SP - 96

EP - 103

JO - SIGNAL PROCESSING

JF - SIGNAL PROCESSING

ER -