Results 1 - 10 of 6,836

Energy Efficient Radio Tomographic Imaging

by Mojgan Khaledi, Sneha Kumar Kasera, Neal Patwari, Maurizio Bocca
"... Abstract—In this paper, our goal is to develop approaches to reduce the energy consumption in Radio Tomographic Imaging (RTI)-based methods for device free localization without giving up localization accuracy. Our key idea is to only measure those links that are near the current location of the movi ..."
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Abstract—In this paper, our goal is to develop approaches to reduce the energy consumption in Radio Tomographic Imaging (RTI)-based methods for device free localization without giving up localization accuracy. Our key idea is to only measure those links that are near the current location

Regularization methods for radio tomographic imaging

by Joey Wilson, Neal Patwari, O Guevara Vasquez - in 2009 Virginia Tech Symposium on Wireless Personal Communications , 2009
"... an emerging technology that uses received signal strength measurements to image the attenuation of objects within a wireless network area. RTI is by nature an ill-posed inverse problem, therefore, regularization techniques must be utilized to obtain accurate images. This paper discusses some common ..."
Abstract - Cited by 13 (7 self) - Add to MetaCart
an emerging technology that uses received signal strength measurements to image the attenuation of objects within a wireless network area. RTI is by nature an ill-posed inverse problem, therefore, regularization techniques must be utilized to obtain accurate images. This paper discusses some common

Magnetospheric radio tomographic imaging with IMAGE and Wind

by unknown authors
"... [1] Recent theoretical studies have shown the feasibility and potential scientific value of radio tomographic imaging of Earth’s magnetosphere by measuring Faraday rotation and phase difference (or group delay) of coherent radio wave signals. On 15 August 2000, a 6 W linearly polarized 828 kHz signa ..."
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[1] Recent theoretical studies have shown the feasibility and potential scientific value of radio tomographic imaging of Earth’s magnetosphere by measuring Faraday rotation and phase difference (or group delay) of coherent radio wave signals. On 15 August 2000, a 6 W linearly polarized 828 k

1 Radio Tomographic Imaging with Wireless Networks

by Joey Wilson, Neal Patwari
"... Abstract—Radio Tomographic Imaging (RTI) is an emerging technology for imaging the attenuation caused by physical objects in wireless networks. This paper presents a linear model for using received signal strength (RSS) measurements to obtain images of moving objects. Noise models are investigated b ..."
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Abstract—Radio Tomographic Imaging (RTI) is an emerging technology for imaging the attenuation caused by physical objects in wireless networks. This paper presents a linear model for using received signal strength (RSS) measurements to obtain images of moving objects. Noise models are investigated

Radio tomographic imaging for ambient assisted living

by Maurizio Bocca, Ossi Kaltiokallio, Neal Patwari - in Evaluating AAL Systems Through Competitive Benchmarking, ser. Communications in Computer and Information
"... Abstract. Accurate localization of people in indoor and domestic en-vironments is one of the key requirements for ambient assisted living (AAL) systems. This chapter describes how the received signal strength (RSS) measurements collected by a network of static radio transceivers can be used to local ..."
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to localize people without requiring them to wear or carry any radio device. We describe a technique named radio tomographic imaging (RTI), which produces real-time images of the change in the radio propagation field of the monitored area caused by the presence of people. People’s locations are inferred from

dRTI: Directional Radio Tomographic Imaging

by Bo Wei, Ambuj Varshney, Neal Patwari
"... Radio tomographic imaging (RTI) enables device free local-isation of people and objects in many challenging environ-ments and situations. Its basic principle is to detect the changes in the statistics of radio signals due to the radio link obstruction by people or objects. However, the local-isation ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
Radio tomographic imaging (RTI) enables device free local-isation of people and objects in many challenging environ-ments and situations. Its basic principle is to detect the changes in the statistics of radio signals due to the radio link obstruction by people or objects. However, the local

Enhancing the accuracy of radio tomographic imaging using channel diversity

by Ossi Kaltiokallio, Maurizio Bocca, Neal Patwari - in 9th IEEE International Conference on Mobile Ad hoc and Sensor Systems (MASS , 2012
"... Abstract—Radio tomographic imaging (RTI) is an emerging device-free localization (DFL) technology enabling the localization of people and other objects without requiring them to carry any electronic device. Instead, the RF attenuation field of the deployment area of a wireless network is estimated u ..."
Abstract - Cited by 27 (17 self) - Add to MetaCart
Abstract—Radio tomographic imaging (RTI) is an emerging device-free localization (DFL) technology enabling the localization of people and other objects without requiring them to carry any electronic device. Instead, the RF attenuation field of the deployment area of a wireless network is estimated

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
is experiencing destructive or constructive multipath interference, and of the sign of RSS change. In addition, a measurement model is proposed which calculates for each RSS measurement the probability of a person being located inside the derived spatial impact area. An online radio tomographic imaging (RTI

A test of magnetospheric radio tomographic imaging with IMAGE and WIND

by R. F. Benson, R. Manning, K. Goetz
"... Abstract. Theoretical studies have shown the potential scientific value of multi-spacecraft radio tomographic imaging of the magnetosphere. The <10 RE WIND perigee passes during August 2000 afforded a unique opportunity to test and verify the capabilities of radio tomography by measuring interspa ..."
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Abstract. Theoretical studies have shown the potential scientific value of multi-spacecraft radio tomographic imaging of the magnetosphere. The <10 RE WIND perigee passes during August 2000 afforded a unique opportunity to test and verify the capabilities of radio tomography by measuring

Radio Tomographic Imaging and Tracking of Stationary and Moving People via Kernel Distance

by Yang Zhao, Neal Patwari, Jeff M. Phillips
"... Network radio frequency (RF) environment sensing (NRES) systems pinpoint and track people in buildings using changes in the signal strength measurements made by a wireless sensor network. It has been shown that such systems can locate people who do not participate in the system by wearing any radio ..."
Abstract - Cited by 16 (5 self) - Add to MetaCart
to quantify the difference between two histograms of signal strength measurements. From five experiments, we show that our kernel distance-based radio tomographic localization system performs better than the state-of-the-art NRES systems in different non line-of-sight environments.
Results 1 - 10 of 6,836