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Author : Jay J. Ely
Publisher : Unknown
Page : 200 pages
File Size : 48,8 Mb
Release : 2003
Category : Airplanes
ISBN : NASA:31769000452444
Author : Jay J. Ely,Nasa Technical Reports Server (Ntrs),Et Al
Publisher : BiblioGov
Page : 202 pages
File Size : 49,6 Mb
Release : 2013-08
Category : Electronic
ISBN : 1289276587
To address the concern for cellular phone electromagnetic interference to aircraft radios, a radiated emission measurement process was developed for two dominant digital standards of wireless handsets. Spurious radiated emissions were efficiently characterized from devices tested in either a semi-anechoic or reverberation chamber, in terms of effective radiated power. Eight representative handsets (four from each digital standard) were commanded to operate while varying their radio transmitter parameters (power, modulation, etc.). This report provides a detailed description of the measurement process and resulting data, which may subsequently be used by others as a basis of consistent evaluation of other portable transmitters using a variety of wireless transmission protocols. Aircraft interference path loss and navigation radio interference threshold data from numerous reference documents, standards, and NASA partnerships were compiled. Using these data, a preliminary risk assessment is provided for wireless phone interference to aircraft Localizer, Glideslope, Very High Frequency Omni directional Range, and Global Positioning Satellite radio receivers on typical transport airplanes. The report identifies where existing data for device emissions, interference path loss, and navigation radio interference thresholds need to be extended for an accurate risk assessment for wireless transmitters in aircraft.
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Page : 198 pages
File Size : 55,9 Mb
Release : 2018-06-15
Category : Electronic
ISBN : 1721133267
To address the concern for cellular phone electromagnetic interference to aircraft radios, a radiated emission measurement process was developed for two dominant digital standards of wireless handsets. Spurious radiated emissions were efficiently characterized from devices tested in either a semi-anechoic or reverberation chamber, in terms of effective radiated power. Eight representative handsets (four from each digital standard) were commanded to operate while varying their radio transmitter parameters (power, modulation, etc.). This report provides a detailed description of the measurement process and resulting data, which may subsequently be used by others as a basis of consistent evaluation of other portable transmitters using a variety of wireless transmission protocols. Aircraft interference path loss and navigation radio interference threshold data from numerous reference documents, standards, and NASA partnerships were compiled. Using these data, a preliminary risk assessment is provided for wireless phone interference to aircraft Localizer, Glideslope, Very High Frequency Omni directional Range, and Global Positioning Satellite radio receivers on typical transport airplanes. The report identifies where existing data for device emissions, interference path loss, and navigation radio interference thresholds need to be extended for an accurate risk assessment for wireless transmitters in aircraft. Ely, Jay J. and Nguyen, Truong X. and Koppen, Sandra V. and Beggs, John H. and Salud, Maria Theresa P. Langley Research Center DFTA03-96-X-90001; WU 728-30-10-01
Author : Anonim
Publisher : Unknown
Page : 236 pages
File Size : 53,9 Mb
Release : 2003
Category : Local area networks (Computer networks)
ISBN : NASA:31769000452428
Author : Anonim
Publisher : Unknown
Page : 1106 pages
File Size : 42,5 Mb
Release : 2002
Category : Air traffic control
ISBN : PSU:000046940254
Author : Haim Mazar
Publisher : Universal-Publishers
Page : 330 pages
File Size : 43,7 Mb
Release : 2009
Category : Political Science
ISBN : 9781599427102
This thesis analyses how and why culture and geography influence the allocation and licensing of the radio frequency (RF) spectrum in different nations. Based on a broad comparative study of 235 countries, an inter-disciplinary approach is used to explore regulatory frameworks and attitudes toward risk. In addition, detailed case studies of the UK, France, the US and Ecuador provide deeper insights into the main contrasting regulatory styles. Three alternative sociological theories are used to analyse and explain the results for both the in-depth and broad brush studies. The Cultural Theory of Mary Douglas and co-workers is first used to categorise countries in terms of perceptual filters. The empirical findings indicate some countries to be apparently exceptional in their behaviour. The theory of Bounded Rationality is used to investigate and explain these apparent irrationalities. Finally, Rational Field Theory shows how beliefs and values guide administrations in their RF regulation. A number of key factors are found to dominate and patterns emerge. The European RF harmonisation is unique. Following European unification, wireless regulation is divided into two major camps (the EU and the US), which differ in their risk concerns, approach to top-down mandated standards, allocation of RF spectrum to licence-exempt bands and type approval process. The adoption of 3G cellular (UMTS versus CDMA2000) and digital TV standards (DVB-T/ATSC/ISDB-T) around the world reflects geopolitical and colonial influence. The language of a country is a significant indicator of its analogue TV standard (SECAM/PAL/NTSC). Interestingly, the longitude of a country to a fair extent defines RF allocation: Africa and West Asia follow Europe, whereas the Americas approximate the US. RF regulation and risk tolerability differ between tropical and non-tropical climates. The collectivised/centralised versus the individualised/market-based rationalities result in different regulatory frameworks and contrasting societal and risk concerns. The success of the top-down European GSM and the bottom-up Wi-Fi standards reveal how the central-planning and market-based approaches have thrived. Attitudes to RF human hazards and spurious emissions levels reveal that the US, Canada and Japan are more tolerant of these radiation risks than Europe. Australia, Canada, New Zealand, UK and USA encourage technological innovation. A practical benefit of this study is that it will give regulators more freedom to choose a rational RF licensing protocol, by better understanding the possibly self-imposed boundaries of cultural and geographical factors which are currently shaping allocation. Academically, there is utility in undertaking a cultural and geographic analysis of a topic that is mostly the domain of engineering, economic and legal analysts.
Author : Jonathan Rougier,Lisa J. Hill,Robert Stephen John Sparks
Publisher : Cambridge University Press
Page : 587 pages
File Size : 43,7 Mb
Release : 2013-02-21
Category : Nature
ISBN : 9781107006195
A state-of-the-art overview of natural hazard risk assessment, for researchers and professionals in natural-hazard science, risk management and environmental science.
Author : United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Transportation and Related Agencies Appropriations
Publisher : Unknown
Page : 1814 pages
File Size : 55,9 Mb
Release : 2002
Category : United States
ISBN : MINN:31951D02238627V
Author : United States. Congress. House. Committee on Appropriations. Subcommittee on the Departments of Transportation and Treasury, and Independent Agencies Appropriations
Publisher : Unknown
Page : 1998 pages
File Size : 43,5 Mb
Release : 2004
Category : Government publications
ISBN : LOC:00126997255
Author : United States. Congress. House. Committee on Appropriations. Subcommittee on the Departments of Transportation and Treasury, and Independent Agencies Appropriations
Publisher : Unknown
Page : 1904 pages
File Size : 54,5 Mb
Release : 2004
Category : Political Science
ISBN : MINN:31951D02461572X
Distributed to some depository libraries in microfiche.
Author : United States. Congress. House. Committee on Appropriations. Subcommittee on Dept. of Transportation and Related Agencies Appropriations
Publisher : Unknown
Page : 2004 pages
File Size : 42,7 Mb
Release : 2002
Category : United States
ISBN : LOC:00095379680
Author : United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Transportation and Related Agencies Appropriations
Publisher : Unknown
Page : 2866 pages
File Size : 50,5 Mb
Release : 2002
Category : United States
ISBN : STANFORD:36105050253454
Author : United States. Congress. House. Committee on Appropriations. Subcommittee on the Departments of Transportation and Treasury, and Independent Agencies Appropriations
Publisher : Unknown
Page : 1900 pages
File Size : 42,5 Mb
Release : 2003
Category : United States
ISBN : MINN:31951D02332726G
Author : United States. Congress. House. Committee on Appropriations. Subcommittee on the Departments of Transportation and Treasury, and Independent Agencies Appropriations
Publisher : Unknown
Page : 1124 pages
File Size : 40,5 Mb
Release : 2003
Category : United States
ISBN : LOC:00098793938
Author : Hailong Huang,Andrey V. Savkin,Chao Huang
Publisher : Academic Press
Page : 218 pages
File Size : 48,5 Mb
Release : 2022-01-03
Category : Technology & Engineering
ISBN : 9780323901833
Wireless Communication Networks Supported by Autonomous UAVs and Mobile Ground Robots covers wireless sensor networks and cellular networks. For wireless sensor networks, the book presents approaches using mobile robots or UAVs to collect sensory data from sensor nodes. For cellular networks, it discusses the approaches to using UAVs to work as aerial base stations to serve cellular users. In addition, the book covers the challenges involved in these two networks, existing approaches (e.g., how to use the public transportation vehicles to play the role of mobile sinks to collect sensory data from sensor nodes), and potential methods to address open questions. Gives a comprehensive understanding of the development of mobile robot-supported wireless communication approaches Provides the latest approaches of mobile robot-supported wireless communication, including scheduling approaches with multiple robots and the online and reactive navigation algorithm Covers interesting research scenarios that include the system model, problem statement, solution and results so that readers will be able to design their own system Presents unresolved research issues and future research directions