The focus on the risk posed by portable electronic devices carried onboard commercial flights has continued to intensify. Recent measurements and analyses have been useful in developing a better understanding of the issues, but has not allowed one to draw firm conclusions about what is happening in today's revenue flight environments. This report summarizes results of a program that developed an instrumentation package and performed in-flight radio frequency (RF) spectrum measurements in commercial aircraft cabins on revenue flights in select aviation critical and personal electronics frequency bands. Specific objectives were to identify cellular in-flight calls and activity rates, assess maximum levels of received power, and identify areas that deserve further research. Measurements were made on 38 flights over the period September 23 through November 19, 2003. These flights were on Boeing 737 (37 flights) and on Airbus 320 (1 flight) model aircraft. Two major U.S. airlines participated in the flight study. This study provided the first reported characterization of the RF environment in the cabins of commercial airline flights. The key conclusions were that (1) onboard cellular telephone calls were observed in-flight and activity is appreciable; (2) signal activity was observed in the aviation critical frequency bands at field strengths capable on causing interference to onboard avionics; and (3) onboard spectral activity was observed at flight critical phases. These findings carry implications for both future research and public policy. Before the industry moves forward with policy changes, significantly more field measurement and analysis of the potential for interference is urgently needed. These studies should include a consideration of the implications of having many onboard transmitters and the potential risks posed by intermodulation.
In-Flight Ratio Frequency Spectrum Measurements of Commercial Aircraft Cabins
2006
76 pages
Report
Keine Angabe
Englisch
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