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Proceedings Paper

Theoretical issues relevant to helmet-mounted display attitude symbology
Author(s): Joseph Armstrong; Sion A. Jennings; Greg Craig
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Paper Abstract

This paper discusses theoretical issues that are relevant to Helmet-Mounted Display (HMD) attitude direction indicator (ADI) design. An ADI shows the relationship between the aircraft wings and the horizon and pilots use it to determine aircraft attitude (pitch and roll). The ADI is used for maintaining an aircraft attitude, capturing a precise attitude and recovering from an unusual attitude. An attitude indicator is an essential instrument because it provides pilots with orientation information that they do not normally have in instrument flight conditions. Recent work suggests that humans orient themselves within a fixed world-reference frame. We will discuss the relationship between the reference frames used by the human orientation system, the reference frames implemented in existing ADIs, and the reference frames available in a helmet-mounted display. A head tracked HMD system allows a system designer to implement symbology in many reference frames including the head, aircraft, and world reference frames. Traditional head down attitude symbology may not be appropriate for HMD use, and it may conflict with the reference frame used by human orientation systems. Based on the author's review of ADIs and frames of reference, research topics are discussed that examine the role of HMD ADI symbology.

Paper Details

Date Published: 23 June 2000
PDF: 8 pages
Proc. SPIE 4021, Helmet- and Head-Mounted Displays V, (23 June 2000); doi: 10.1117/12.389160
Show Author Affiliations
Joseph Armstrong, Carleton Univ. (Canada)
Sion A. Jennings, National Research Council Canada (Canada)
Greg Craig, National Research Council Canada (Canada)


Published in SPIE Proceedings Vol. 4021:
Helmet- and Head-Mounted Displays V
Ronald J. Lewandowski; Loran A. Haworth; Henry J. Girolamo, Editor(s)

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