Results 251 to 260 of about 861,138 (294)

Weak signal detection in SPC

Applied Stochastic Models in Business and Industry, 2019
AbstractChanges in the behavior of dynamic systems are detected based on changes in the monitored quantities or their characteristics. This detection usually takes place by monitoring the time evolution of a variable and detecting the change at the time when a predetermined threshold is exceeded.
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A weak signal detection system: Design and simulation

2015 IEEE International Conference on Information and Automation, 2015
In many cases, the signal of interest is obscured by noise. Noise such as the inherent noise of system and the interference of the external environment is inevitable, so a weak signal detection system is designed in this paper to solve the de-noising problem in strong noise backgrounds.
Tingxuan Hu, Dong Zhang, Jianhe Lei, Qiang Wei   +3 more
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Optimum distributed detection of weak signals in dependent sensors

IEEE Transactions on Information Theory, 1992
Locally optimum (LO) distributed detection is considered for observations that are dependent from sensor to sensor. The necessary conditions are presented for LO distributed sensor detector designs. and a locally optimum fusion rule for an N-sensor parallel distributed detection system with dependent sensor observations is given. Specific solutions are
Rick S. Blum, Saleem A. Kassam
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Frequency sensitivity in weak signal detection

Physical Review E, 1999
The phenomenon of frequency sensitivity in weak signal detection has been studied via numerical simulation in the cases of a single neuron and a neuronal network, respectively. The membrane potential undergoes a damping oscillation to the quiescent state with a frequency of 11--33 Hz under a subthreshold bias.
Feng Liu, JiaFu Wang, Wei Wang
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SDHT for Fast Detection of Weak GNSS Signals

IEEE Journal on Selected Areas in Communications, 2015
Successful and fast Global Navigation Satellite System (GNSS) positioning in indoor environments can enable many location based services (LBS). However, fast indoor GNSS positioning has been one of the biggest challenges for GNSS receivers due to the huge computational cost.
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A combined method of weak signal detection

2009 Asia-Pacific Conference on Computational Intelligence and Industrial Applications (PACIIA), 2009
In this paper, we present a new method based on the theory of chaotic oscillator and wavelet transform. Chaotic systems are sensitive to certain signals and immune to noise at the same time, the properties of which demonstrate their potential application in weak signal frequency detection.
null Lv Huiying, null Cao Zhiyu, null Yan Xiaopeng, null Li Ping   +3 more
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Asymptotically stable detection of a weak signal

International Journal of Adaptive Control and Signal Processing, 2013
SUMMARYTo design highly efficient and robust detectors of a weak signal, an asymptotic approach to stable estimation exploiting redescending score functions is used. Two new indicators of robustness of detection, the detection error sensitivity and detection stability, are introduced.
Shevlyakov, Georgy, Shin, Vladimir, Lee, Seokhyoung, Kim, Kiseon   +3 more
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Methods for Detecting Weak Light Signals

Journal of the Optical Society of America, 1968
Theoretical and experimental evaluation of three low-level photodetection techniques, namely, lock-in, noise-voltage, and electron-pulse counting are presented. The 992 cm−1 Raman band of benzene excited by a 4.2-mW He–Ne laser operating at 6328 A provided a weak light signal which was detected by an EMI 9558 A, cooled photomultiplier.
R. R. Alfano, N. Ockman
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Application of Chaos in Weak Signal Detection

2011 Third International Conference on Measuring Technology and Mechatronics Automation, 2011
Chaos theory has extensive applications in many fields, and the research on this technique has important theory and practice value, which especially more and more demonstrates its superiority in the weak signal detection. In this paper, application methods of chaos in weak signal detection are instructed.
Nie Chunyan, Wang Zhuwen
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Current progress on weak signal detection

2013 International Conference on Quality, Reliability, Risk, Maintenance, and Safety Engineering (QR2MSE), 2013
In machinery condition monitoring, weak signal is a type of signal that has very low signal-to-noise ratio (SNR). Therefore, it is necessary to develop effective methods so as to enhance or extract useful information from the noisy signal. These methods aim to solve the problem of de-noising and separation of mixed-signal.
Jie Wang, Lu Yang, Long Gao, Qiang Miao
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