A Human Subject Evaluation of Airport Surface Situational Awareness Using Prototypical Flight Deck Electronic Taxi Chart Displays
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1995-11-01
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Edition:Final Report August 1993 - August 1995
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Abstract:A study was conducted to test the effect on airport surface situational awareness of GPS derived position information ; depicted on a prototypical electronic taxi chart display. The effect of position error and position uncertainty ; symbology were also tested. Situational awareness was assessed by asking 12 airline pilots a series of probe questions ; about their location on the airport surface. The pilots used static "snapshot" images of a north-up electronic taxi ; chart as well as a supporting out-the-window view and an aircraft heading display to answer the situational awareness ; probe questions. ; Four levels of GPS position error were tested ranging from 4.5 to 90 meters. Two types of position uncertainty ; symbology were also tested. The variable radius uncertainty circle displayed an estimate of the current GPS position ; accuracy while the constant radius uncertainty circle displayed a worst-case system accuracy of 100 meters. ; Situational awareness, as indicated by probe question response accuracy, increased when aircraft position information ; was displayed on the electronic taxi chart. In addition, response time was also found to improve with the presence of ; aircraft position information. Response accuracy improved as position error decreased from 90 to 22.5 meters and stayed ; relatively constant from the 22.5 to 4.5 meter case. Pilots were faster at responding to the probe questions with the ; variable radius uncertainty symbology. In addition, pilots subjectively preferred the variable radius uncertainty ; circle.
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Main Document Checksum:urn:sha256:1640c6b95d84379e9bb2c3b4869694fb1f450eb298bdd2fad41fa97e4a3af282