Graphical Analysis of Electromagnetic Coupling on B-737 and B-757 Aircraft for VOR and LOC IPL Data

摘要

The use of portable wireless technology has increased dramatically over the past few years. PEDs may act as transmitters and their signals may be detected by the various radio receiver antennas installed on the aircraft. Measurement of the radiated field coupling between passenger cabin locations and aircraft communication and navigation receivers, via their antennas is defined herein as interference path loss (IPL). Personnel from NASA Langley Research Center and Delta Air Lines recently completed extensive IPL measurements on several Boeing 757 airplanes. Prior research includes analysis of measurements on United Airlines Boeing 737 airplanes as well. Compared to the B-737, the B-757 is composed of a longer fuselage, more exit doors, windows, emergency exits and the aircraft antenna placements are different. Figure I shows the interior schematics of both B-737 and B-757 where the nose is on the left of both schematics. The objective of this paper is to analyze the IPL data measured, to better understand the impact on coupling levels based on the different locations of the aircraft radio antennas on the B-757 and B-737 airplanes, and to provide a basis for future fuzzy logic modeling of airplane IPL. This effort will build upon previous frizzy modeling of IPL data for B-737 airplane data. Systems studied and compared include the Instrument Landing System Localizer (LOC) and VHF Omniranging (VOR) system.