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Portable Wireless LAN Device and Two-Way Radio Threat Assessment for Aircraft VHF Communication Radio Band
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
Published: 2018-06-03
Total Pages: 94
ISBN-13: 9781720663874
DOWNLOAD EBOOK →This document summarizes the safety analysis performed on a Flight Guidance System (FGS) requirements model. In particular, the safety properties desired of the FGS model are identified and the presence of the safety properties in the model is formally verified. Chapter 1 provides an introduction to the entire project, while Chapter 2 gives a brief overview of the problem domain, the nature of accidents, model based development, and the four-variable model. Chapter 3 outlines the approach. Chapter 4 presents the results of the traditional safety analysis techniques and illustrates how the hazardous conditions associated with the system trace into specific safety properties. Chapter 5 presents the results of the formal methods analysis technique model checking that was used to verify the presence of the safety properties in the requirements model. Finally, Chapter 6 summarizes the main conclusions of the study, first and foremost that model checking is a very effective verification technique to use on discrete models with reasonable state spaces. Additional supporting details are provided in the appendices.Nguyen, Truong X. and Koppen, Sandra V. and Ely, Jay J. and Williams, Reuben A. and Smith, Laura J. and Salud, Maria Theresa P.Langley Research CenterLOCAL AREA NETWORKS; VERY HIGH FREQUENCIES; WIRELESS COMMUNICATION; PORTABLE EQUIPMENT; RADIO COMMUNICATION; AVIONICS; AIRCRAFT COMMUNICATION; THREAT EVALUATION; REVERBERATION CHAMBERS; FREQUENCIES; COLLISION AVOIDANCE; SAFETY; ELECTROMAGNETIC INTERFERENCE; DATA REDUCTION
Portable Integrated Wireless Device Threat Assessment to Aircraft Radio Systems
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
Published: 2018-06-03
Total Pages: 94
ISBN-13: 9781720663669
DOWNLOAD EBOOK →An assessment was conducted on multiple wireless local area network (WLAN) devices using the three wireless standards for spurious radiated emissions to determine their threat to aircraft radio navigation systems. The measurement process, data and analysis are provided for devices tested using IEEE 802.11a, IEEE 802.11b, and Bluetooth as well as data from portable laptops/tablet PCs and PDAs (grouping known as PEDs). A comparison was made between wireless LAN devices and portable electronic devices. Spurious radiated emissions were investigated in the radio frequency bands for the following aircraft systems: Instrument Landing System Localizer and Glideslope, Very High Frequency (VHF) Communication, VHF Omnidirectional Range, Traffic Collision Avoidance System, Air Traffic Control Radar Beacon System, Microwave Landing System and Global Positioning System. Since several of the contiguous navigation systems were grouped under one encompassing measurement frequency band, there were five measurement frequency bands where spurious radiated emissions data were collected for the PEDs and WLAN devices. The report also provides a comparison between emissions data and regulatory emission limit.Salud, Maria Theresa P. and Williams, Reuben A. (Technical Monitor)Langley Research CenterELECTRONIC EQUIPMENT; RADIO FREQUENCY INTERFERENCE; AIRCRAFT COMMUNICATION; WIRELESS COMMUNICATION; PORTABLE EQUIPMENT; COMMUNICATION EQUIPMENT; LOCAL AREA NETWORKS; VERY HIGH FREQUENCY RADIO EQUIPMENT; INSTRUMENT LANDING SYSTEMS; MICROWAVE LANDING SYSTEMS; COLLISION AVOIDANCE; GLOBAL POSITIONING SYSTEM; RADAR BEACONS
Symposium Record
23rd DASC
Proceedings
22nd DASC
Wireless Phone Threat Assessment and New Wireless Technology Concerns for Aircraft Navigation Radios
Author: Jay J. Ely
Publisher: BiblioGov
Published: 2013-08
Total Pages: 202
ISBN-13: 9781289276584
DOWNLOAD EBOOK →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.
Wireless Phone Threat Assessment and New Wireless Technology Concerns for Aircraft Navigation Radios
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
Published: 2018-06-15
Total Pages: 198
ISBN-13: 9781721133260
DOWNLOAD EBOOK →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
Third Generation Wireless Phone Threat Assessment for Aircraft Communication and Navigation Radios
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
Published: 2018-06-27
Total Pages: 214
ISBN-13: 9781721944514
DOWNLOAD EBOOK →Radiated emissions in aircraft communication and navigation bands are measured from third generation (3G) wireless mobile phones. The two wireless technologies considered are the latest available to general consumers in the US. The measurements are conducted using reverberation chambers. The results are compared against baseline emissions from laptop computers and personal digital assistant devices that are currently allowed to operate on aircraft. Using existing interference path loss data and receivers interference threshold, a risk assessment is performed for several aircraft communication and navigation radio systems. In addition, cumulative interference effects of multiple similar devices are conservatively estimated or bounded. The effects are computed by summing the interference power from individual devices that is scaled according to the interference path loss at its location. Nguyen, Truong X. and Koppen, Sandra V. and Smith, Laura J. and Williams, Reuben A. and Salud, Maria Theresa P. Langley Research Center DTFA03-96-X-90001; 23R-772-96
