Results 241 to 250 of about 1,205,866 (291)

Interpreting weak backscattering signals: new results

International Journal of Remote Sensing, 2018
The interpretation of lidar information was carried out here inverting the weak backscattering signals returned from a homogeneous atmosphere where atmospheric parameters are constant in space. It was performed interpreting weak backscattering signals using the linear approximation and the preliminary calculated value of the extinction coefficient. The
A D Yegorov, I A Potapova, N A Sanotskaya   +2 more
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Weak signal enhancement in radar signal processing

20th International Conference Radioelektronika 2010, 2010
In through wall tracking of multiple targets it is able to detect many times only a target moving closest to the radar antenna system. It results from the fact that the reflections from targets located further from the radar antennas are very week in comparison to that target. The methods for weak signal enhancement can solve the outlined problem.
Jana Rovnakova, Dusan Kocur
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Using Weak Signals

2018
As speed of change accelerates, it becomes increasingly difficult to predict changes with sufficient accuracy and reliability to permit a timely full-scale ...
H. Igor Ansoff, Daniel Kipley, A. O. Lewis, Roxanne Helm-Stevens, Rick Ansoff   +4 more
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GNSS signal acquisition in weak signal condition

2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP), 2014
In this paper, a new method for Global Navigation Satellite System (GNSS) signal acquisition in weak signal condition is considered, mainly on bit transition and accumulation over multiple code periods. The impact of bit transition on the acquisition block is analyzed and an algorithm based on the Discrete Fourier Transform (DFT) operation is proposed ...
Can Zhu, Xiangning Fan
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Exploiting vibrational resonance in weak-signal detection

Physical Review E, 2017
In this paper, we investigate the first exploitation of the vibrational resonance (VR) effect to detect weak signals in the presence of strong background noise. By injecting a series of sinusoidal interference signals of the same amplitude but with different frequencies into a generalized correlation detector, we show that the detection probability can
Ren, Yuhao, Pan, Yan, Duan, Fabing, Chapeau-Blondeau, François, Abbott, Derek   +4 more
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Weak Signals in Information Security Management

2005
Usually, information security management practices do not explicitly take account of weak signals, factors that lie below the detection surface, which may, however, constitute a huge security threat. This study analyses what kinds of weak signals are present in information security, followed by a discussion on their detection. Responses to weak signals
Kajava, Jorma, Savola, Reijo, Varonen, Rauno   +3 more
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Detection of Weak Light Signals*

Journal of the Optical Society of America, 1970
The experimental signal-to-noise ratios (S/N) of four photomultiplier light-detection systems are obtained for two values of the dc anode signal and dc anode dark current. The photodetection systems investigated are dc amplifier, lock-in, noise power, and combined lock-in plus noise power.
Richard J. Anderson, J. Cleary
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Weak and Strong Signals

The Scandinavian Journal of Economics, 2002
Akerlof, Spence and Stiglitz showed that competitive markets can perform very poorly in the presence of informational asymmetry. In this paper I show that if there is a signaling technology which is sufficiently strong (i.e., the marginal cost of signaling declines sufficiently rapidly with quality) the cost of sorting is low and a Nash equilibrium ...
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Ultrafast Detection Of Weak Signals

SPIE Proceedings, 1988
ABSTRACT Femtosecond nonlinear detection techniques for weak signals are discussed. New methods for the characterization of femtosecond sig­ nals, in amplitude and phase, are presented. 1. INTRODUCTION Several nonlinear detection techniques have been developed with the passively mode- locked dye laser as a source, using the com­ bination of Rh6G as ...
J. C. Diels, N. Jamasbi, C. Yan, M. Lai
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Phase conjugation of weak signals

LEOS '95. IEEE Lasers and Electro-Optics Society 1995 Annual Meeting. 8th Annual Meeting. Conference Proceedings, 2002
We describe investigations into the conjugation of weak signals, corresponding to a few photons. We have used a variety of techniques, combining various methods of Brillouin amplification and phase conjugation with a laser pre-amplifier. Four Brillouin phase conjugation techniques were used to amplify or conjugate the signal, and in the case of ...
A.M. Scott, D.C. Jones, K.D. Ridley, G. Cook   +3 more
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