The Experts below are selected from a list of 354 Experts worldwide ranked by ideXlab platform
Chengyu Cao - One of the best experts on this subject based on the ideXlab platform.
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hawk an unmanned mini helicopter based aerial Wireless kit for localization
IEEE Transactions on Mobile Computing, 2014Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, HAWK, for conducting aerial localization. HAWK is a programmable mini helicopter Draganflyer X6 armed with a Wireless Sniffer Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for HAWK to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve-based flight route to the hot area for a fine-grained localization of a target of interest. We have conducted extensive experiments to validate the feasibility of HAWK and our theory. A demo of HAWK in autonomous fly is available at http://www.youtube.com/watch?v=ju86xnHbEq0.
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2012 Proceedings IEEE INFOCOM HAWK: An Unmanned Mini Helicopter-based Aerial Wireless Kit for Localization
2013Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:Abstract—This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, HAWK, for conducting aerial localization. HAWK is a programmable mini helicopter- Draganflyer X6- armed with a Wireless Sniffer-Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for HAWK to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve based flight route to the hot area for a fine-grained localization of a target of interest. Therefore, HAWK does not rely on a positioning infrastructure for localization. We have conducted extensive experiments to validate the feasibility of HAWK and our theory. A demo of HAWK in autonomous fly is available a
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hawk an unmanned mini helicopter based aerial Wireless kit for localization
International Conference on Computer Communications, 2012Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, HAWK, for conducting aerial localization. HAWK is a programmable mini helicopter - Draganflyer X6 - armed with a Wireless Sniffer - Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for HAWK to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve based flight route to the hot area for a fine-grained localization of a target of interest. Therefore, HAWK does not rely on a positioning infrastructure for localization. We have conducted extensive experiments to validate the feasibility of HAWK and our theory. A demo of HAWK in autonomous fly is available at http://www.youtube.com/watch?v=ju86xnHbEq0.
Zhongli Liu - One of the best experts on this subject based on the ideXlab platform.
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Effective RSS Sampling for Forensic Wireless Localization
2016Co-Authors: Yinjie Chen, Zhongli Liu, Wei ZhaoAbstract:Abstract. In many applications such as Wireless crime scene investiga-tion, we want to use a single device moving along a route for accurate and efficient localization without the help of any positioning infrastructure or trained signal strength map. Our experiments show that in a complicated environment, such as building corridors and downtown areas, triangula-tion or trilateration cannot be used for accurate localization via single device. A simple approach, which is better and robust, is to use where the maximum RSS (received signal strength) is sensed as the target’s lo-cation. The question is how to make sure the maximum RSS is received while moving. Our novel RSS sampling theory presented in this paper an-swers this question: if RSS samples can reconstruct a target transmitter’s power distribution over space, the location corresponding to the peak of such power distribution is the target’s location. We apply the Nyquist sampling theory to the RSS sampling process, and derive a mathematical model to determine the RSS sampling rate given the target’s distance and its packet transmission rate. To validate our RSS sampling theory, we developed BotLoc, which is a programmable and self-coordinated robot armed with a Wireless Sniffer. We conducted extensive simulations and real-world experiments and the experimental results match the theory very well. A video of BotLoc is a
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hawk an unmanned mini helicopter based aerial Wireless kit for localization
IEEE Transactions on Mobile Computing, 2014Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, HAWK, for conducting aerial localization. HAWK is a programmable mini helicopter Draganflyer X6 armed with a Wireless Sniffer Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for HAWK to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve-based flight route to the hot area for a fine-grained localization of a target of interest. We have conducted extensive experiments to validate the feasibility of HAWK and our theory. A demo of HAWK in autonomous fly is available at http://www.youtube.com/watch?v=ju86xnHbEq0.
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2012 Proceedings IEEE INFOCOM HAWK: An Unmanned Mini Helicopter-based Aerial Wireless Kit for Localization
2013Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:Abstract—This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, HAWK, for conducting aerial localization. HAWK is a programmable mini helicopter- Draganflyer X6- armed with a Wireless Sniffer-Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for HAWK to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve based flight route to the hot area for a fine-grained localization of a target of interest. Therefore, HAWK does not rely on a positioning infrastructure for localization. We have conducted extensive experiments to validate the feasibility of HAWK and our theory. A demo of HAWK in autonomous fly is available a
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theory underlying measurement of aoa with a rotating directional antenna
International Conference on Computer Communications, 2013Co-Authors: Yinjie Chen, Zhongli Liu, Benyuan Liu, Wei ZhaoAbstract:In many Wireless localization applications, we rotate a directional antenna to derive the angle of arrival (AOA) of Wireless signals transmitted from a target mobile device. The AOA corresponds to the direction in which the maximum received signal strength (RSS) is sensed. However, an unanswered question is how to make sure the directional antenna picks up packets producing the maximum RSS while rotating. We propose a set of novel RSS sampling theory to answer this question. We recognize the process that a directional antenna measures RSS of Wireless packets while rotating as the process that the radiation pattern of the directional antenna is sampled. Therefore, if RSS samples can reconstruct the antenna's radiation pattern, the direction corresponding to the peak of the radiation pattern is the AOA of the target. We derive mathematical models to determine the RSS sampling rate given the target's packet transmission rate. Our RSS sampling theory is applicable to various types of directional antennas. To validate our RSS sampling theory, we developed BotLoc, which is a programmable and self-coordinated robot armed with a Wireless Sniffer. We conducted extensive real-world experiments and the experimental results match the theory very well. A video of BotLoc is at www.youtube.com/watch?v=WtUt0IqhXRU&feature=youtu.be.
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hawk an unmanned mini helicopter based aerial Wireless kit for localization
International Conference on Computer Communications, 2012Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, HAWK, for conducting aerial localization. HAWK is a programmable mini helicopter - Draganflyer X6 - armed with a Wireless Sniffer - Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for HAWK to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve based flight route to the hot area for a fine-grained localization of a target of interest. Therefore, HAWK does not rely on a positioning infrastructure for localization. We have conducted extensive experiments to validate the feasibility of HAWK and our theory. A demo of HAWK in autonomous fly is available at http://www.youtube.com/watch?v=ju86xnHbEq0.
Yinjie Chen - One of the best experts on this subject based on the ideXlab platform.
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Effective RSS Sampling for Forensic Wireless Localization
2016Co-Authors: Yinjie Chen, Zhongli Liu, Wei ZhaoAbstract:Abstract. In many applications such as Wireless crime scene investiga-tion, we want to use a single device moving along a route for accurate and efficient localization without the help of any positioning infrastructure or trained signal strength map. Our experiments show that in a complicated environment, such as building corridors and downtown areas, triangula-tion or trilateration cannot be used for accurate localization via single device. A simple approach, which is better and robust, is to use where the maximum RSS (received signal strength) is sensed as the target’s lo-cation. The question is how to make sure the maximum RSS is received while moving. Our novel RSS sampling theory presented in this paper an-swers this question: if RSS samples can reconstruct a target transmitter’s power distribution over space, the location corresponding to the peak of such power distribution is the target’s location. We apply the Nyquist sampling theory to the RSS sampling process, and derive a mathematical model to determine the RSS sampling rate given the target’s distance and its packet transmission rate. To validate our RSS sampling theory, we developed BotLoc, which is a programmable and self-coordinated robot armed with a Wireless Sniffer. We conducted extensive simulations and real-world experiments and the experimental results match the theory very well. A video of BotLoc is a
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hawk an unmanned mini helicopter based aerial Wireless kit for localization
IEEE Transactions on Mobile Computing, 2014Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, HAWK, for conducting aerial localization. HAWK is a programmable mini helicopter Draganflyer X6 armed with a Wireless Sniffer Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for HAWK to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve-based flight route to the hot area for a fine-grained localization of a target of interest. We have conducted extensive experiments to validate the feasibility of HAWK and our theory. A demo of HAWK in autonomous fly is available at http://www.youtube.com/watch?v=ju86xnHbEq0.
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2012 Proceedings IEEE INFOCOM HAWK: An Unmanned Mini Helicopter-based Aerial Wireless Kit for Localization
2013Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:Abstract—This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, HAWK, for conducting aerial localization. HAWK is a programmable mini helicopter- Draganflyer X6- armed with a Wireless Sniffer-Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for HAWK to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve based flight route to the hot area for a fine-grained localization of a target of interest. Therefore, HAWK does not rely on a positioning infrastructure for localization. We have conducted extensive experiments to validate the feasibility of HAWK and our theory. A demo of HAWK in autonomous fly is available a
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theory underlying measurement of aoa with a rotating directional antenna
International Conference on Computer Communications, 2013Co-Authors: Yinjie Chen, Zhongli Liu, Benyuan Liu, Wei ZhaoAbstract:In many Wireless localization applications, we rotate a directional antenna to derive the angle of arrival (AOA) of Wireless signals transmitted from a target mobile device. The AOA corresponds to the direction in which the maximum received signal strength (RSS) is sensed. However, an unanswered question is how to make sure the directional antenna picks up packets producing the maximum RSS while rotating. We propose a set of novel RSS sampling theory to answer this question. We recognize the process that a directional antenna measures RSS of Wireless packets while rotating as the process that the radiation pattern of the directional antenna is sampled. Therefore, if RSS samples can reconstruct the antenna's radiation pattern, the direction corresponding to the peak of the radiation pattern is the AOA of the target. We derive mathematical models to determine the RSS sampling rate given the target's packet transmission rate. Our RSS sampling theory is applicable to various types of directional antennas. To validate our RSS sampling theory, we developed BotLoc, which is a programmable and self-coordinated robot armed with a Wireless Sniffer. We conducted extensive real-world experiments and the experimental results match the theory very well. A video of BotLoc is at www.youtube.com/watch?v=WtUt0IqhXRU&feature=youtu.be.
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hawk an unmanned mini helicopter based aerial Wireless kit for localization
International Conference on Computer Communications, 2012Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, HAWK, for conducting aerial localization. HAWK is a programmable mini helicopter - Draganflyer X6 - armed with a Wireless Sniffer - Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for HAWK to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve based flight route to the hot area for a fine-grained localization of a target of interest. Therefore, HAWK does not rely on a positioning infrastructure for localization. We have conducted extensive experiments to validate the feasibility of HAWK and our theory. A demo of HAWK in autonomous fly is available at http://www.youtube.com/watch?v=ju86xnHbEq0.
Benyuan Liu - One of the best experts on this subject based on the ideXlab platform.
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hawk an unmanned mini helicopter based aerial Wireless kit for localization
IEEE Transactions on Mobile Computing, 2014Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, HAWK, for conducting aerial localization. HAWK is a programmable mini helicopter Draganflyer X6 armed with a Wireless Sniffer Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for HAWK to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve-based flight route to the hot area for a fine-grained localization of a target of interest. We have conducted extensive experiments to validate the feasibility of HAWK and our theory. A demo of HAWK in autonomous fly is available at http://www.youtube.com/watch?v=ju86xnHbEq0.
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2012 Proceedings IEEE INFOCOM HAWK: An Unmanned Mini Helicopter-based Aerial Wireless Kit for Localization
2013Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:Abstract—This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, HAWK, for conducting aerial localization. HAWK is a programmable mini helicopter- Draganflyer X6- armed with a Wireless Sniffer-Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for HAWK to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve based flight route to the hot area for a fine-grained localization of a target of interest. Therefore, HAWK does not rely on a positioning infrastructure for localization. We have conducted extensive experiments to validate the feasibility of HAWK and our theory. A demo of HAWK in autonomous fly is available a
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theory underlying measurement of aoa with a rotating directional antenna
International Conference on Computer Communications, 2013Co-Authors: Yinjie Chen, Zhongli Liu, Benyuan Liu, Wei ZhaoAbstract:In many Wireless localization applications, we rotate a directional antenna to derive the angle of arrival (AOA) of Wireless signals transmitted from a target mobile device. The AOA corresponds to the direction in which the maximum received signal strength (RSS) is sensed. However, an unanswered question is how to make sure the directional antenna picks up packets producing the maximum RSS while rotating. We propose a set of novel RSS sampling theory to answer this question. We recognize the process that a directional antenna measures RSS of Wireless packets while rotating as the process that the radiation pattern of the directional antenna is sampled. Therefore, if RSS samples can reconstruct the antenna's radiation pattern, the direction corresponding to the peak of the radiation pattern is the AOA of the target. We derive mathematical models to determine the RSS sampling rate given the target's packet transmission rate. Our RSS sampling theory is applicable to various types of directional antennas. To validate our RSS sampling theory, we developed BotLoc, which is a programmable and self-coordinated robot armed with a Wireless Sniffer. We conducted extensive real-world experiments and the experimental results match the theory very well. A video of BotLoc is at www.youtube.com/watch?v=WtUt0IqhXRU&feature=youtu.be.
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hawk an unmanned mini helicopter based aerial Wireless kit for localization
International Conference on Computer Communications, 2012Co-Authors: Zhongli Liu, Yinjie Chen, Benyuan Liu, Chengyu CaoAbstract:This paper presents a fully functional and highly portable mini Unmanned Aerial Vehicle (UAV) system, HAWK, for conducting aerial localization. HAWK is a programmable mini helicopter - Draganflyer X6 - armed with a Wireless Sniffer - Nokia N900. We developed custom PI-Control laws to implement a robust waypoint algorithm for the mini helicopter to fly a planned route. A Moore space filling curve is designed as a flight route for HAWK to survey a specific area. A set of theorems were derived to calculate the minimum Moore curve level for sensing all targets in the area with minimum flight distance. With such a flight strategy, we can confine the location of a target of interest to a small hot area. We can recursively apply the Moore curve based flight route to the hot area for a fine-grained localization of a target of interest. Therefore, HAWK does not rely on a positioning infrastructure for localization. We have conducted extensive experiments to validate the feasibility of HAWK and our theory. A demo of HAWK in autonomous fly is available at http://www.youtube.com/watch?v=ju86xnHbEq0.
Chávez, Carlos Orlando - One of the best experts on this subject based on the ideXlab platform.
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Influencia de la radiación solar sobre el desempeño de las redes wi-fi en la banda de los 5 ghz (802.11a)
Universidad Rafael Belloso Chacín, 2007Co-Authors: Chávez, Carlos OrlandoAbstract:The fundamental intention of this investigation was the analysis of the influence of the solar radiation on the Wi-Fi networks performance that operate in the 5 GHz band (802.11a), with the purpose of determining to what extent the incident solar radiation affects the performance of these networks in terms of throughput and the percentage of lost packages. For the data collection of performance a test Wi-Fi network was designed and implemented operating in the 5 GHz band formed in Ad-Hoc mode and, with the aid of a Wireless Sniffer, throughput and loss of package were obtained; at the same time the data of solar radiation provided by the weather station of the Faculty of Architecture and Design of the University of Zulia was analyzed. The obtained results indicate that the solar radiation exerts a significant influence on the performance of the Wi-Fi networks that operate in the 5 GHz band. In order to reach this conclusion, a performance index was created based on throughput and the loss of packages that, once quantified, was tabulated together with the values solar radiation values later to make a statistical analysis of regression and correlation of variables. The obtained finding serves as reference to companies as to network professionals, in order that they take in consideration this meteorological parameter at the moment of implementing networks that operate in the 5 GHz bands in geographical areas with the climatic characteristics of the Maracaibo.El propósito fundamental de esta investigación fue el análisis de la influencia de la radiación solar sobre el desempeño de las redes WI-FI que operan en la banda de los 5 GHz (802.11a), con el fin de determinar en qué medida la radiación solar incidente afecta el desempeño de estas redes en términos de throughput y porcentaje de paquetes perdidos. Para la recolección de datos de desempeño se diseñó e implementó una red WI-FI de prueba operando en la banda de 5 GHz configurada en modo Ad-Hoc donde, con la ayuda de un Sniffer inalámbrico, se obtuvieron las métricas del throughput y pérdida de paquetes; a la vez que se analizaron los datos de radiación solar suministrados por la estación meteorológica de la Facultad de Arquitectura y Diseño de la Universidad del Zulia. Los resultados obtenidos mediante el análisis estadístico de correlación y regresión de variables, indican que la radiación solar ejerce una significativa influencia sobre el desempeño de las redes Wi-Fi que operan en la banda de 5 GHz. El hallazgo obtenido sirve de referencia tanto a empresas como a profesionales de redes, para que tomen en consideración este parámetro meteorológico a la hora de implementar estas redes que operen en la banda de 5 GHz en áreas geográficas con las características climáticas de la ciudad de Maracaibo
