Results 1 - 10 of 187

The support vector machine for dielectric target detection through a wall

by F. -f. Wang, Y. -r. Zhang - Progress In Electromagnetics Research Letters , 2011
"... Abstract—In this paper, a novel approach based on the support vector machine (SVM) for dielectric target detection in through-wall scenario is proposed. Through-wall detection is converted to the establishment and use of a mapping between backscattered data and the dielectric parameter of the target ..."
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Abstract—In this paper, a novel approach based on the support vector machine (SVM) for dielectric target detection in through-wall scenario is proposed. Through-wall detection is converted to the establishment and use of a mapping between backscattered data and the dielectric parameter

Through-Wall Radar Image Reconstruction Based on Time-Domain Transient

by Anthony T. S. Ho, W. H. Tham, K. S. Low - Signals in the Presence of Noise,” 2005 IEEE International Geoscience and Remote Sensing Symposium, Proceedings , 2005
"... Abstract ⎯ Through-wall radar imaging has become a keen research topic in recent years. This is due to the emphasis on homeland security, which involves many key areas such as gathering intelligence, concealed weapons detection and domestic counter-terrorism. Other applications of through-wall radar ..."
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Abstract ⎯ Through-wall radar imaging has become a keen research topic in recent years. This is due to the emphasis on homeland security, which involves many key areas such as gathering intelligence, concealed weapons detection and domestic counter-terrorism. Other applications of through-wall

1A Fade Level-based Spatial Model for Radio Tomographic Imaging

by Ossi Kaltiokallio, Maurizio Bocca, Neal Patwari Member
"... Abstract—RSS-based device-free localization (DFL) monitors changes in the received signal strength (RSS) measured by a network of static wireless nodes to locate and track people without requiring them to carry or wear any electronic device. Current models assume that the spatial impact area, i.e., ..."
Abstract - Cited by 6 (5 self) - Add to MetaCart
) system is described which uses channel diversity and the presented models. Experiments in an open indoor environment, in a typical one-bedroom apartment and in a through-wall scenario are conducted to determine the performance of the proposed system. We demonstrate that the new system is capable

1A Multi-Scale Spatial Model for RSS-based Device-Free Localization

by Ossi Kaltiokallio, Maurizio Bocca, Neal Patwari Member
"... Abstract—RSS-based device-free localization (DFL) monitors changes in the received signal strength (RSS) measured by a network of static wireless nodes to locate people without requiring them to carry or wear any electronic device. Current models assume that the spatial impact area, i.e., the area i ..."
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and the presented models. Experiments in an open indoor environment, in a typical one-bedroom apartment and in a through-wall scenario are conducted to determine the accuracy of the system. We demonstrate that the new system is capable of localizing and tracking a person with high accuracy ( ≤ 0.30 m) in all

THROUGH-THE-WALL DETECTION OF STATIONARY HUMAN TARGETS USING DOPPLER RADAR

by R. M. Narayanan, M. C. Shastry, P. -h. Chen, M. Levi
"... Abstract—In homeland security and law enforcement situations, it is often required to remotely detect human targets obscured by walls and barriers. In particular, we are specifically interested in scenarios that involve a human whose torso is stationary. We propose a technique to detect and characte ..."
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and characterize activity associated with a stationary human in through-the-wall scenarios using a Doppler radar system. The presence of stationary humans is identified by detecting Doppler signatures resulting from breathing, and movement of the human arm and wrist. The irregular, transient, non-uniform, and non

COMPUTER SIMULATION OF THERMAL IMPACT OF AIR INFILTRATION THROUGH MULTILAYERED EXTERIOR WALLS

by unknown authors
"... Convective air circulation occurring through wall layers is frequently observed in building envelopes. Significant thermal coupling can take place between the incoming cold/warm air and the wall structure, thereby modifying the thermal performances of the envelope. This paper presents an unsteady th ..."
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Convective air circulation occurring through wall layers is frequently observed in building envelopes. Significant thermal coupling can take place between the incoming cold/warm air and the wall structure, thereby modifying the thermal performances of the envelope. This paper presents an unsteady

1 Ultra wideband radar for through wall detection from the RADIOTECT project

by unknown authors
"... The first section of the paper will introduce the philosophy behind the RADIOTECT project, which includes investigation into through wall applications and through clothes imaging for rescue and security applications. The second section of the paper will shortly introduce the project partners. The th ..."
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The first section of the paper will introduce the philosophy behind the RADIOTECT project, which includes investigation into through wall applications and through clothes imaging for rescue and security applications. The second section of the paper will shortly introduce the project partners

Transition scenario of the round jet in crossflow topology at low velocity ratios

by Tristan Cambonie, Jean-luc Aider
"... We study experimentally a round Jet In CrossFlow (JICF) at low values of the jet-to-crossflow velocity ratio R using instantaneous and time-averaged three-dimensions three-components (3D3C) velocimetry. The difference between instantaneous and time-averaged swirling structures of the JICF is emphasi ..."
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is emphasized. Through the analysis of spatial distribution of instantaneous transverse and longitudinal vortices the main transitions of the JICF are characterized for 0.15 < R < 2.2. A new transition at very low velocity ratio is found (R < 0.3). When R is large enough (R> 1.25), the classic JICF

Throughwall imaging using real-aperture radar

by R. Benjamin, I. J. Craddock, E. Mccutcheon, R. Nilavalan - Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security and Homeland Defense IV, Proceedings of SPIE Volume , 2005
"... There are numerous occasions when it is desirable to inspect the interior of a room or building when physically entering the room may be either impossible or hazardous. These situations include civil engineering, search and rescue and law-enforcement scenarios. This contribution investigates the use ..."
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the use of a relatively low-frequency, synthetically-focussed radar for through-wall imaging, it describes a number of experiments carried out using this radar and presents results from these experiments.

ABSTRACT Title of dissertation: LINEAR AND NONLINEAR ANALYSIS OF A GYRO-PENIOTRON OSCILLATOR AND STUDY OF START-UP SCENARIO

by In A High, Order Mode Gyrotron, Muralidhar Yeddulla
"... The Cyclotron Resonant Maser (CRM) is a device in which electrons gyrating in an external magnetic field produce coherent EM radiation. A DC electron beam current must be converted to an AC beam current to create RF energy. There are two possible approaches: phase bunching (O-type) and spatial segre ..."
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. In spatial segregation, electrons entering the interaction region at different times are deflected in different directions. With an appropriate spatially varying RF field, all electrons can lose energy leading to very high conversion efficiency. A CRM with a smooth walled cylindrical waveguide interaction
Results 1 - 10 of 187