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Proceedings Paper

Issues in simultaneous HMD display of multireference frames for helicopter applications
Author(s): Edward N. Bachelder; R. John Hansman Jr.
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Paper Abstract

A preliminary study was conducted to investigate the use of reference markers found in the head-fixed frame as an aid to reference frame awareness during aircraft flight while using a helmet mounted display. Three reference-cueing displays were compared: (1) Sparse Reference display: all cockpit and airframe markers removed except for the instrument panel, (2) Cockpit Reference display: entire cockpit environment visible, and (3) Geo/Cockpit Reference display: cockpit environment visible with the addition of a surrounding wire-frame globe. The visual scenery was displayed to subjects using a helmet-mounted virtual reality device that had a 40 X 50 degree field of view liquid crystal display. The study involved six pilots. The task was to locate targets from aural alert information. The aural alerts were based in either the Aircraft reference frame (i.e. target clock position relative to the aircraft nose), or the World reference frame (i.e. target bearing). These tasks were conducted while the subject rode through abrupt maneuvering flight at low level in a fixed-based Cobra helicopter simulator. Performance measures of the pilot's ability to discriminate the intended target from secondary targets in the visual field were collected, as well as subjective ratings for each reference display. The Geo/Cockpit Reference display produced the highest target detection scores for both Aircraft and World-reference alerts. The highest overall detection scores were produced when World-referenced alerts were issued while using the Geo/Cockpit display. The Cockpit display scores were higher than the Sparse display's for both alert types. Subjective scores showed pilot preference for the Geo/Cockpit Reference display over the two displays for both Aircraft and World-reference alerts. A secondary exploratory experiment using the same tasking as the initial experiment was also conducted which observed the effect of peripheral cues. Target detection scores for both alert types decreased when peripheral cues were removed from the Cockpit display. Detection scores also decreased with the removal of peripheral cues from the Geo/Cockpit display during the Aircraft-referenced alerts.

Paper Details

Date Published: 31 May 1996
PDF: 9 pages
Proc. SPIE 2736, Enhanced and Synthetic Vision 1996, (31 May 1996); doi: 10.1117/12.241035
Show Author Affiliations
Edward N. Bachelder, Massachusetts Institute of Technology (United States)
R. John Hansman Jr., Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 2736:
Enhanced and Synthetic Vision 1996
Jacques G. Verly, Editor(s)

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