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SCIENTIFIC AND TECHNICAL AEROSPACE REPORTS

A Biweekly Publication of the National Aeronautics and Space Administration
VOLUME 44, ISSUE 4 - February 24, 2006

NASA STAR REPORTS: 02/24/06
Aeronautics

02 Aerodynamics

03 Air Transportation and Safety

04 Aircraft Communications and Navigation

05 Aircraft Design, Testing and Performance

06 Avionics and Instrumentation

07 Aircraft Propulsion and Power

04 AIRCRAFT COMMUNICATIONS AND NAVIGATION
Includes all modes of communication with and between aircraft; air navigation systems (satellite and ground based); and air traffic control.

For related information see also 06 Avionics and Aircraft Instrumentation; 17 Space Communications, Spacecraft Communications, Command and Tracking; and 32 Communications and Radar.


20060006319 Defence Science and Technology Organisation, Melbourne, Australia

Detection and Identification of Simultaneous Communications in a Simulated Flying Task

McAnally, Ken; Martin, Russell; Doman, Jodie; Eberle, Geoff; Parker, Simon; New Directions for Improving Audio Effectiveness; April 2005, pp. 31-1 - 31-6; In English; See also 20060006290; Original contains black and white illustrations; Copyright; Avail.: CASI:

Operators of military flight vehicles are often required to attend to more than one source of communications signal. Previous research has shown that the intelligibility of a speech message in a background of speech distractors is improved if the signals are presented using a 3-dimensional (3-d) audio display rather than the traditional diotic configuration. However, whether infrequent target messages (e.g., callsigns) are more reliably detected in a continuous monitoring task with high temporal uncertainty when using a 3-d audio display has not been examined. This study examined participants' ability to detect a target callsign and identify a colour/number combination associated with it while engaged in a 20-minute, simulated formation-flying task. Participants were required to monitor 5 communications channels in each of which messages were presented at random intervals. (On average, 2.4 channels were simultaneously active.) Thirty targets were presented over the 20-minute period. There were three audio display conditions: diotic, all channels in front, and channels separated in azimuth (3-d). Detection of target callsigns was significantly higher in the 3-d condition compared to the other conditions. Detections and false alarms were combined to calculate sensitivity and criterion measures using signal detection theory. Sensitivity was significantly higher in the 3-d condition compared with the other conditions, but there were no differences in criterion. Also, consistent with previous results, correct identification of the target number/colour combination was significantly higher in the 3-d condition compared with the other conditions. Author

Signal Detection; Channels (Data Transmission); Formation Flying; Intelligibility; Azimuth

Source: NASA


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