Results 221 to 230 of about 146,386 (253)
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Optics Letters, 2012
We propose and experimentally demonstrate a photonic approach to the measurement of the time-difference-of-arrival (TDOA) and the angle-of-arrival (AOA) of a microwave signal. In the proposed system, the TDOA and the AOA are equivalently converted into a phase shift between two replicas of a microwave signal received at two cascaded modulators.
Xihua, Zou +5 more
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We propose and experimentally demonstrate a photonic approach to the measurement of the time-difference-of-arrival (TDOA) and the angle-of-arrival (AOA) of a microwave signal. In the proposed system, the TDOA and the AOA are equivalently converted into a phase shift between two replicas of a microwave signal received at two cascaded modulators.
Xihua, Zou +5 more
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Distributed time and frequency difference of arrival tracking in clutter
2012 Workshop on Sensor Data Fusion: Trends, Solutions, Applications (SDF), 2012We consider passive surveillance using time and frequency difference of arrival signals received by mobile receiver pairs. Signals received by a pair of receivers are correlated in time and frequency, followed by a detection process. In addition to the target (emitter) measurements, we may also create a number of spurious detections in each scan.
Darko Musicki +2 more
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Navigation from time differences of arrival
The Journal of the Acoustical Society of America, 2004A brief history and a few modern developments are given for hyperboliclike navigation systems in which location is estimated from measurements of the difference in the propagation time of a signal from two or more known locations. Today, hyperbolic navigation is used in locating ships, calling animals, GPS receivers, cellular telephones, and other ...
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The Journal of the Acoustical Society of America, 2007
Much research has been done in the area of estimating time-difference-of-arrival (TDOA) and frequency-difference-of-arrival (FDOA) and their use in locating a radiating source. Early work in this area focused on locating acoustic sources using passive sonar processing.
Mark L. Fowler, Xi Hu
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Much research has been done in the area of estimating time-difference-of-arrival (TDOA) and frequency-difference-of-arrival (FDOA) and their use in locating a radiating source. Early work in this area focused on locating acoustic sources using passive sonar processing.
Mark L. Fowler, Xi Hu
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Indoor Localization Using 802.11 Time Differences of Arrival
IEEE Transactions on Instrumentation and Measurement, 2016This paper proposes a novel time-based method for determining the position of an IEEE 802.11g transmitter using multiple mutually synchronized 802.11g receivers. By means of baseband signal processing, the proposed algorithm obtains a high-resolution estimate of the time of arrival (TOA) of the long training sequence symbol at each receiver.
Ahmed Makki +4 more
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Geolocation by time difference of arrival using hyperbolic asymptotes
2004 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2004The paper proposes a new simplified algorithm to estimate the location of an emitter by utilizing time difference of arrival (TDOA) measurements. This is achieved by recasting the estimation problem in prolate spheroidal coordinates. Prolate spheroidal coordinates greatly simplify the TDOA equations, producing a set of linear equations in the far field
Samuel P. Drake, Kutluyil Dogançay
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Array Shape Observability From Time Differences of Arrival
IEEE Transactions on Aerospace and Electronic Systems, 2011In this paper, we study the observability conditions for the relative position of a set of passive sensors from the measured time differences of arrival (TDOA) of signals from a set of noncooperative sources lying in the same plane. The sources are broadband to measure the TDOA and far enough to consider each source is detected in the same line of ...
Claude Jauffret +2 more
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Time Difference of Arrival Enhancement with Ray Tracing Simulation
2018A Hybrid technique is proposed to improve the Time Difference of Arrival (TDoA) Localization systems in Non-line of Sight situation. A Ray tracing simulation tool is used to extract the time of arrival difference characteristic from the environment and binding with the TDoA a multilateration sensor scheme to estimate the position of an electromagnetic ...
Marcelo N. de Sousa +2 more
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State-space modeling and estimation of time differences of arrival
IEEE Transactions on Acoustics, Speech, and Signal Processing, 1986We propose a new method for time differences of arrival (TDOA's) estimation of multiple sources whose spectra are unknown. In the first part, we show how state-space techniques can be used to easily arrive at an exact discrete global model of the transfer between the source inputs and sensor outputs for sources having rational spectra and for integer ...
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COMPARISON OF QUEUES WITH DIFFERENT DISCRETE-TIME ARRIVAL PROCESSES
Probability in the Engineering and Informational Sciences, 2001Traveling times in a FIFO-stochastic event graph are compared in increasing convex ordering for different arrival processes. As a special case, a stochastic lower bound is obtained for the sojourn time in a tandem network of FIFO queues with a Markov arrival process.
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