Results 31 to 40 of about 1,454,719 (294)

Symmetries and time operators [PDF]

, 2010
All covariant time operators with normalized probability distribution are derived. Symmetry criteria are invoked to arrive at a unique expression for a given Hamiltonian.
Hegerfeldt, G. C., Muga, J. G.
core   +1 more source

Time-of-arrival distributions from position-momentum and energy-time joint measurements [PDF]

, 1999
The position-momentum quasi-distribution obtained from an Arthurs and Kelly joint measurement model is used to obtain indirectly an ``operational'' time-of-arrival (TOA) distribution following a quantization procedure proposed by Kocha\'nski and W ...
A. D. Baute, A.D. Baute, A.J. Bracken, C.R. Leavens, D.M. Appleby, D.M. Appleby, E. Arthurs, E.B. Davies, G.R. Allcock, G.R. Allcock, G.R. Allcock, G.S. Agarwal, H. Martens, I. Egusquiza, I. L. Egusquiza, J. Finkelstein, J. G. Muga, J. Halliwell, J. Kijowski, J. Kijowski, J. Oppenheim, J. von Neumann, J.G. Muga, J.G. Muga, J.G. Muga, J.G. Muga, J.J. Halliwell, K. Wódkiewicz, L. Cohen, L. Cohen, L. Cohen, M. Toller, M.G. Raymer, P. Busch, P. Busch, P. Kochański, P. Kochański, P. Törmä, R. Sala, R. Sala Mayato, R. Werner, R. Werner, R.F. O’Connell, S. Stenholm, S.L. Braunstein, U. Leonhardt, V. Delgado, W.L. Power, Y. Aharonov, Y. Aharonov, Y. Aharonov   +50 more
core   +2 more sources

A Novel Position Estimation Method Based on Displacement Correction in AIS

Sensors, 2014
A new position estimation method by using the signals from two automatic identification system (AIS) stations is proposed in this paper. The time of arrival (TOA) method is enhanced with the displacement correction, so that the vessel’s position can be ...
Yi Jiang, Shufang Zhang, Dongkai Yang
doaj   +1 more source

Free motion time-of-arrival operator and probability distribution [PDF]

, 1999
We reappraise and clarify the contradictory statements found in the literature concerning the time-of-arrival operator introduced by Aharonov and Bohm in Phys. Rev. {\bf 122}, 1649 (1961).
A. Galindo, A.S. Holevo, D.T. Pegg, E. Recami, G. Ludwig, G.R. Allcock, G.R. Allcock, G.R. Allcock, H. Paul, I. L. Egusquiza, J. G. Muga, J. Kijowski, J. Kijowski, J. León, J. Oppenheim, J.G. Muga, J.G. Muga, J.G. Muga, J.G. Muga, M. Razavi, M. Toller, N. Grot, N.I. Akhiezer, P. Busch, P. Busch, R. Giannitrapani, R. Sala, R. Werner, V. Delgado, V.S. Olkhovsky, Y. Aharonov, Y. Aharonov   +31 more
core   +2 more sources

High-Resolution Time of Arrival Estimation With Small Samples Considering Time-Varying Channel Fading Coefficient Correlation in OFDM

IEEE Access, 2019
This paper proposes a new method using orthogonal frequency division multiplexing (OFDM) signals for time-of-arrival (TOA) estimation in complex environments, such as electromagnetic interference and short burst received signals. Under that circumstance,
Peng Zhang, Bin Ba, Wei-Jia Cui
doaj   +1 more source

A Comprehensive Survey on Short-Distance Localization of UAVs

Drones
The localization of Unmanned Aerial Vehicles (UAVs) is a critical area of research, particularly in applications requiring high accuracy and reliability in Global Positioning System (GPS)-denied environments.
Luka Kramarić, Niko Jelušić, Tomislav Radišić, Mario Muštra   +3 more
doaj   +1 more source

Underground positioning method of single base station DOA and TOA based on single reflectio

Gong-kuang zidonghua, 2015
In view of problem of big error in underground single base station positioning system due to wireless signal influenced by multipath effect and non-line of sight, a joint estimation positioning method of DOA and TOA based on single reflection was ...
HUANG Kai, ZHAI Yanrong, ZHANG Pengcheng, ZHU Mengying   +3 more
doaj   +1 more source

Sensor Localization Using Time of Arrival Measurements in a Multi-Media and Multi-Path Application of In-Situ Wireless Soil Sensing

Inventions, 2021
The problem of localization of nodes of a wireless sensor network placed in different physical media (anchor nodes above ground and sensor nodes underground) is addressed in this article.
Herman Sahota, Ratnesh Kumar
doaj   +1 more source

Multipath-Assisted Ultra-Wideband Vehicle Localization in Underground Parking Environment Using Ray-Tracing

Sensors
In complex underground parking scenarios, non-line-of-sight (NLOS) obstructions significantly impede positioning signals, presenting substantial challenges for accurate vehicle localization.
Shuo Hu, Lixin Guo, Zhongyu Liu, Shuaishuai Gao   +3 more
doaj   +1 more source

Radio frequency Echo mapping with cellular devices

Scientific Phone Apps and Mobile Devices, 2018
In this paper, a method is presented that employs portable cellular devices to perform three-dimensional localization of metallic objects from a set of time-delayed signals.
Isahar Gabay, Meir Danino, Zeev Zalevsky
doaj   +1 more source