The Experts below are selected from a list of 48024 Experts worldwide ranked by ideXlab platform
Sean V. Hum - One of the best experts on this subject based on the ideXlab platform.
-
An Ultra-Wideband Spatial Filter for Time-of-Arrival Localization in Tunnels
IEEE Transactions on Antennas and Propagation, 2013Co-Authors: Natalie A. Jones, Sean V. HumAbstract:An ultra-wideband (UWB) Spatial Filter is proposed to mitigate multipath effects in a one-way time-of-arrival (TOA) localization system that localizes along one dimension inside a tunnel. The Spatial Filter is a two-dimensional weighted array of judiciously placed antennas that exploits the fact that electromagnetic waves propagate as modes in a tunnel by selectively extracting these mode(s). The design of several Spatial Filters is presented alongside vigorous analyses to characterize the localization performance afforded by them in a noisy environment. The Filters are evaluated using data from an analytical equation waveguide model, a ray tracer model and measurements. These Spatial Filters deliver accurate localization estimates across distance and well-designed Filters can operate at higher signal-to-noise ratios (SNRs) than single sensors and their performance is comparable to basic time-reversal (TR) systems. Moreover, the use of the Spatial Filter in the localization system allows for relatively simple signal processing of received signals in comparison to alternative receiver architectures, such as Rake and TR. Insights into successful Spatial Filter design are provided in this contribution and this Spatial Filtering technique has created a new branch of multipath-aware localization systems.
-
ICUWB - An ultra-wideband Spatial Filter for a tunnel environment
2012 IEEE International Conference on Ultra-Wideband, 2012Co-Authors: Natalie T. Jones, Sean V. HumAbstract:An ultra-wideband (UWB) Spatial Filter concept is proposed for one-dimensional time-of-arrival (TOA) localization in a tunnel environment. The Spatial Filter exploits the fact that electromagnetic waves travel as modes in a tunnel and that these modes can be Filtered using a sparse array of antennas. It is shown that the Spatial Filter delivers centimeter ranging accuracy at moderate to high signal-to-noise ratio (SNR) values even when the tunnel is heavily overmoded. Results generated using an analytical equation model and ray tracing model are used to evaluate the performance of the Spatial Filter.
Natalie A. Jones - One of the best experts on this subject based on the ideXlab platform.
-
An Ultra-Wideband Spatial Filter for Time-of-Arrival Localization in Tunnels
IEEE Transactions on Antennas and Propagation, 2013Co-Authors: Natalie A. Jones, Sean V. HumAbstract:An ultra-wideband (UWB) Spatial Filter is proposed to mitigate multipath effects in a one-way time-of-arrival (TOA) localization system that localizes along one dimension inside a tunnel. The Spatial Filter is a two-dimensional weighted array of judiciously placed antennas that exploits the fact that electromagnetic waves propagate as modes in a tunnel by selectively extracting these mode(s). The design of several Spatial Filters is presented alongside vigorous analyses to characterize the localization performance afforded by them in a noisy environment. The Filters are evaluated using data from an analytical equation waveguide model, a ray tracer model and measurements. These Spatial Filters deliver accurate localization estimates across distance and well-designed Filters can operate at higher signal-to-noise ratios (SNRs) than single sensors and their performance is comparable to basic time-reversal (TR) systems. Moreover, the use of the Spatial Filter in the localization system allows for relatively simple signal processing of received signals in comparison to alternative receiver architectures, such as Rake and TR. Insights into successful Spatial Filter design are provided in this contribution and this Spatial Filtering technique has created a new branch of multipath-aware localization systems.
Kuaisheng Zou - One of the best experts on this subject based on the ideXlab platform.
-
Performance of a simplified slit Spatial Filter for large laser systems
Optics express, 2014Co-Authors: Han Xiong, Xiao Yuan, Xiang Zhang, Kuaisheng ZouAbstract:A new-type slit Spatial Filter system with three lenses was proposed, in which the focal spot was turned into focal line by adding cylindrical lenses to increase focal area and then lower the focal intensity. Its performances on image relay, aperture matching and Spatial Filtering are comprehended by detailed theoretical calculations and numerical simulation. According to transmission Spatial Filter in national ignition facility, we present a replaceable slit Spatial Filter, which can reduce the overall length of laser system, improve the beam quality and suppress or even avoid the pinhole (slit) closure in the Spatial Filter.
Han Xiong - One of the best experts on this subject based on the ideXlab platform.
-
Characteristics and performance of a two-lens slit Spatial Filter for high power lasers
Optics Communications, 2017Co-Authors: Han Xiong, Xiang Zhang, Fan Gao, Zhenwu Zhuang, Jianjun Zhao, Xiao YuanAbstract:Abstract The characteristics of a two-lens slit Spatial Filtering system on image relay and Spatial Filtering are discussed with detailed theoretical calculation and numerical simulation. The slit Spatial Filter can be used as the cavity Spatial Filter in large laser systems, such as National Ignition Facility, which can significantly decrease the focal intensity in cavity Spatial Filter and suppress or even avoid the pinhole (slit) closure while keeping the output power and beam quality. Additionally, the overall length of the cavity Spatial Filter can be greatly reduced with the use of the two-lens slit Spatial Filter.
-
Performance of a simplified slit Spatial Filter for large laser systems
Optics express, 2014Co-Authors: Han Xiong, Xiao Yuan, Xiang Zhang, Kuaisheng ZouAbstract:A new-type slit Spatial Filter system with three lenses was proposed, in which the focal spot was turned into focal line by adding cylindrical lenses to increase focal area and then lower the focal intensity. Its performances on image relay, aperture matching and Spatial Filtering are comprehended by detailed theoretical calculations and numerical simulation. According to transmission Spatial Filter in national ignition facility, we present a replaceable slit Spatial Filter, which can reduce the overall length of laser system, improve the beam quality and suppress or even avoid the pinhole (slit) closure in the Spatial Filter.
Xiao Yuan - One of the best experts on this subject based on the ideXlab platform.
-
Characteristics and performance of a two-lens slit Spatial Filter for high power lasers
Optics Communications, 2017Co-Authors: Han Xiong, Xiang Zhang, Fan Gao, Zhenwu Zhuang, Jianjun Zhao, Xiao YuanAbstract:Abstract The characteristics of a two-lens slit Spatial Filtering system on image relay and Spatial Filtering are discussed with detailed theoretical calculation and numerical simulation. The slit Spatial Filter can be used as the cavity Spatial Filter in large laser systems, such as National Ignition Facility, which can significantly decrease the focal intensity in cavity Spatial Filter and suppress or even avoid the pinhole (slit) closure while keeping the output power and beam quality. Additionally, the overall length of the cavity Spatial Filter can be greatly reduced with the use of the two-lens slit Spatial Filter.
-
Performance of a simplified slit Spatial Filter for large laser systems
Optics express, 2014Co-Authors: Han Xiong, Xiao Yuan, Xiang Zhang, Kuaisheng ZouAbstract:A new-type slit Spatial Filter system with three lenses was proposed, in which the focal spot was turned into focal line by adding cylindrical lenses to increase focal area and then lower the focal intensity. Its performances on image relay, aperture matching and Spatial Filtering are comprehended by detailed theoretical calculations and numerical simulation. According to transmission Spatial Filter in national ignition facility, we present a replaceable slit Spatial Filter, which can reduce the overall length of laser system, improve the beam quality and suppress or even avoid the pinhole (slit) closure in the Spatial Filter.
