Results 51 to 60 of about 90,878 (176)

Numerical Investigation of the Time Discretization Impact on the Accuracy of a Point Target Localization by UWB Radar

EPJ Web of Conferences, 2018
UWB radar technologies enable localization of moving persons (targets) situated behind nonmetallic obstacles. Under exact knowledge of the propagation times, from the transmitting to the receiving antennas, of the radar emitted electromagnetic wave (time
Buša Ján, Kocur Dušan, Švecová Mária   +2 more
doaj   +1 more source

Autonomous orbit determination and navigation for formations of CubeSats beyond LEO [PDF]

, 2017
This paper investigates the use of the Time Of Arrival (TOA) and Doppler shift to allow a small formation of CubeSats to navigate beyond low Earth orbit (LEO).
Grey, Stuart, Serra, Romain, Torre, Francesco, Vasile, Massimiliano   +3 more
core   +2 more sources

Time‐Domain Computation of Propagation Characteristics of Partial Discharge in Cross‐Linked Polyethylene High‐Voltage Cable Incorporating Modified Frequency‐Dependent Parameters

High Voltage, EarlyView.
ABSTRACT The propagation characteristics of partial discharge (PD) in cables impact PD detection sensitivity, defect localisation accuracy and defect severity evaluation. Currently, the effects of semiconducting materials' frequency‐dependent properties and corrugated aluminium sheath structures on PD signal propagation in high‐voltage (HV) cables ...
Weisheng He, Yang You, Zhaoguo Wu, Zhe Hou, Xiong Liu, Xiao Ren, Yuan Yan   +6 more
wiley   +1 more source

Comparison of different X‐ray‐based scanning electron microscopy methods to detect sub‐nanometre ultra‐thin InAs layers deposited on top of GaAs

Journal of Microscopy, EarlyView.
Abstract We compare three different methods of X‐ray analysis in a scanning electron microscope (SEM): energy‐dispersive X‐ray spectroscopy (EDX), wavelength‐dispersive X‐ray spectroscopy (WDX) and micro X‐ray fluorescence (μXRF). These methods are all applied to the same gallium arsenide (GaAs) wafer with a 0.8 nm layer of indium arsenide (InAs) on ...
Thomas Walther, Stuart Creasey‐Gray, Stephan Boehm, Heath Young, Yang Yang   +4 more
wiley   +1 more source

Time of Arrival Based on Chirp Pulses as a means to Perform Localization in IEEE 802.15.4a Wireless Sensor Networks

Advances in Electrical and Computer Engineering, 2010
This paper introduces the technology Time of Arrival (TOA) based on chirp pulses (according to IEEE 802.15.4a) as a means to perform localization in Wireless Sensor Networks (WSN's) active at 2.4 GHz.
NAUWELAERS, B., De STRYCKER, L., GOEMAERE, J.-P., WYFFELS, J., Van NIEUWENHUYSE, A.   +4 more
doaj   +1 more source

A novel time of arrival estimation algorithm using an energy detector receiver in MMW systems

EURASIP Journal on Advances in Signal Processing, 2017
This paper presents a new time of arrival (TOA) estimation technique using an improved energy detection (ED) receiver based on the empirical mode decomposition (EMD) in an impulse radio (IR) 60 GHz millimeter wave (MMW) system.
Xiaolin Liang, Hao Zhang, Tingting Lyu, Han Xiao, T. Aaron Gulliver   +4 more
doaj   +1 more source

Determining bismuth content in GaAsBi alloys by energy‐dispersive X‐ray spectroscopy: A case study with multiple sets of k*‐factors for analytical transmission electron microscopy

Journal of Microscopy, EarlyView.
Abstract Measuring the bismuth (Bi) content of ternary gallium arsenide bismuthide (GaAsBi) alloys is important because it sensitively influences their bandgap, and Bi is known to segregate vertically to the surface and sometimes also laterally during growth, so elemental distribution maps need to be quantified.
T. Walther
wiley   +1 more source

A Review of Linear Multilateration Techniques and Applications

IEEE Access
In multilateration, distances between an unknown location and several known points are used to determine the location of the unknown point. Papers on algorithms for multilateration, such as time of arrival (TOA), time difference of arrival (TDOA), and ...
Eric Widdison, David G. Long
doaj   +1 more source

A Closed-Form Localization Algorithm and GDOP Analysis for Multiple TDOAs and Single TOA Based Hybrid Positioning

Applied Sciences, 2019
Cellular communication systems support mobile phones positioning function for Enhanced-911 (E-911) location requirements, but the positioning accuracy is poor. The fifth-generation (5G) cellular communication system can use indoor distribution systems to
Zhongliang Deng, Hanhua Wang, Xinyu Zheng, Xiao Fu, Lu Yin, Shihao Tang, Fuxing Yang   +6 more
doaj   +1 more source

Proteus II: design and evaluation of an integrated power-efficient underwater sensor node [PDF]

, 2015
We describe the design and evaluation of an integrated low-cost underwater sensor node designed for reconfigurability, allowing continuous operation on a relatively small rechargeable battery for one month.
Havinga, Paul J.M., Kleunen, Wouter A.P. van, Meratnia, Nirvana, Moseley, Niels A.   +3 more
core   +6 more sources