Positioning techniques and telematic applications in the 2.4 GHz-band — Indoor and outdoor analysis results based on a commercial wide band location system

2010 ◽  
Author(s):  
Robert Richter ◽  
Oliver Michler ◽  
Richard Weber ◽  
Sven Zeisberg
Keyword(s):  
Wide Band ◽  
Location System ◽  
Indoor And Outdoor

scholarly journals A BOOK RETRIEVAL AND LOCATION SYSTEM BASED ON REAL-SCENE 3D

2019 ◽  
Vol XLII-2/W13 ◽  
pp. 903-908
Author(s):  
S. Wei ◽  
B. Li ◽  
Z. Guo ◽  
S. Guo ◽  
L. Cheng
Keyword(s):  
Indoor Environment ◽  
Moving Objects ◽  
Spatial Location ◽  
Building Structures ◽  
Human Beings ◽  
Location System ◽  
3D Space ◽  
Real Scene ◽  
3D Information ◽  
Indoor And Outdoor

<p><strong>Abstract.</strong> With the development of urbanization, the building structures are more and more complex, and various moving objects, such as human beings, robots and unmanned aerial vehicles, often travel through indoor and outdoor 3D space, which puts forward higher requirements for the accurate search and location in indoor and outdoor space. At present, most of the spatial location methods for indoor entities are carried out through 2D maps. However, the indoor environment is a complex 3D space, which increases the difficulty of the search process. In addition, 2D map cannot accurately display the 3D spatial position of the entity. Therefore, it is difficult for 2D maps to search and locate in complex environment. Therefore, how to quickly and effectively carry out spatial location query in complex indoor environment has become an urgent problem to be solved. Taking the library of Beijing University of Civil Engineering and Architecture as an example, this paper obtains the indoor 3D information of the library based on SLAM, processes and publishes the acquired 3D information on IndoorViewer, and uses its API in the book retrieval system. Finally, a book retrieval and location system based on real-scene 3D is finished.</p>

scholarly journals Control and application of accuracy positioning estimation based real-time location system

2019 ◽  
Vol 9 (2) ◽  
pp. 82-88
Author(s):  
Ahmet Aktaş
Keyword(s):  
Occupational Health ◽  
Real Time ◽  
Control Algorithm ◽  
Health And Safety ◽  
Wide Band ◽  
Occupational Health And Safety ◽  
Ultra Wide Band ◽  
Location System ◽  
Real Time Location System ◽  
Location Systems

Nowadays, with the development of ultra-wide band antennas and internet of thing technologies, tracing systems are being developed in many fields such as security, health, mining and transportation. The accuracy location estimation issue is becoming very important in areas of application where occupational health and safety are high. In these applications, the transfer of information between the target and the manager, whose location must be accuracy known, has become indispensable. Especially when the target person is human, the movement parameters such as speed, acceleration, position and altitude compose the calculation parameters of the central management system. The information to be sent by the worker in emergency situations and warnings explain the need for real-time location systems to avoid a possible occupational accident. This paper includes real-time location system structure and improved accuracy location control algorithm, which are being used in occupational health and safety, hospital, storage, mine and tracing areas. The real-time location system was designed using a DWM1000 location sensor module with an ultra-wide band integrated antenna. Product usage time has been extended in designed real-time location cards with low power consuming processors. An accuracy positioning control algorithm has been improved to quickly and exactly locate the target to be tracked. With this algorithm, a new approach to real-time location systems has been introduced and worker tracing, information and warning systems are made with fast response time. The control cards developed in a sample workspace were tested and the application results on the developed computer virtual map interface were given.

An Experimental Evaluation of IEEE 802.15.4a Ultra Wide Band Technology for Precision Indoor Ranging

2012 ◽  
Vol 4 (2) ◽  
pp. 48-63 ◽  
Author(s):  
Tingcong Ye ◽  
Michael Walsh ◽  
Peter Haigh ◽  
John Barton ◽  
Alan Mathewson ◽  
...  
Keyword(s):  
Wide Band ◽  
Ultra Wide Band ◽  
Line Of Sight ◽  
Network Localization ◽  
Outdoor Environments ◽  
Ieee 802.15.4A ◽  
Indoor And Outdoor Environments ◽  
First Time ◽  
Fine Time ◽  
Indoor And Outdoor

Ultra Wide Band (UWB) wireless transmission has recently been the object of considerable attention in the field of next generation location aware wireless sensor networks (WSNs). This is due to its fine time resolution, energy efficiency and robustness to interference in harsh environments. This paper presents a thorough applied examination of prototype IEEE 802.15.4a impulse UWB transceiver technology to quantify the effect of line of sight (LOS) and non line of sight (NLOS) ranging in real indoor and outdoor environments. The results included draw on an extensive array of experiments that fully characterize the 802.15.4a UWB transceiver technology, its reliability and ranging capabilities for the first time. The goal of this work is to validate the technology as a dependable wireless communication mechanism for the subset of sensor network localization applications where reliability and precision positions are key concerns.

A lightweight semantic-location system for indoor and outdoor behavior modelling

2021 ◽  
Author(s):  
Aritz Bilbao Jayo ◽  
Xabier Cantero ◽  
Aitor Almeida ◽  
Luca Fasano ◽  
Teodoro Montanaro ◽  
...  
Keyword(s):  
Location System ◽  
Outdoor Behavior ◽  
Indoor And Outdoor ◽  
Semantic Location

Seven-colour photometry at the Geneva Observatory

1966 ◽  
Vol 24 ◽  
pp. 262-266 ◽  
Author(s):  
M. Golay
Keyword(s):  
Wide Band ◽  
Electric System ◽  
Band Type

During the last 5 years, we have developed a seven-colour photometry at the Geneva Observatory. Our multicolour photo-electric system is of a wide-band type; the bandwidth being about 500Å for four filters. The three others are similar to theUBVsystem. In Table 1 we give the filter combinations used in our photometry (1).

TEM and cathodoluminescence of precipitates in II-VI semiconductors

1988 ◽  
Vol 46 ◽  
pp. 488-489
Author(s):  
Joanna L. Batstone
Keyword(s):  
Crystal Growth ◽  
Band Gap ◽  
Local Strain ◽  
Wide Band ◽  
Optoelectronic Device ◽  
Wide Band Gap ◽  
Bulk Crystal Growth ◽  
Transmission Electron ◽  
Device Applications ◽  
Stoichiometry Control

Interest in II-VI semiconductors centres around optoelectronic device applications. The wide band gap II-VI semiconductors such as ZnS, ZnSe and ZnTe have been used in lasers and electroluminescent displays yielding room temperature blue luminescence. The narrow gap II-VI semiconductors such as CdTe and HgxCd1-x Te are currently used for infrared detectors, where the band gap can be varied continuously by changing the alloy composition x.Two major sources of precipitation can be identified in II-VI materials; (i) dopant introduction leading to local variations in concentration and subsequent precipitation and (ii) Te precipitation in ZnTe, CdTe and HgCdTe due to native point defects which arise from problems associated with stoichiometry control during crystal growth. Precipitation is observed in both bulk crystal growth and epitaxial growth and is frequently associated with segregation and precipitation at dislocations and grain boundaries. Precipitation has been observed using transmission electron microscopy (TEM) which is sensitive to local strain fields around inclusions.

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