NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Head-Mounted and Head-Up Display GlossaryOne of the problems in head-up and helmet-mounted display (HMD) literature has been a lack of standardization of words and abbreviations. Several different words have been used for the same concept; for example, flight path angle, flight path marker, velocity vector, and total velocity vector all refer to the same thing. In other cases, the same term has been used with two different meanings, such as binocular field-of-view which means the field-of-view visible to both left and right eyes according to some or the field-of-view visible to either the left or right eye or both according to others. Many of the terms used in HMD studies have not been well-defined. We need to have a common language to ensure that system descriptions are communicated. As an example, the term 'stabilized' has been widely used with two meanings. 'Roll-stabilized' has been used to mean a symbol which rotates to indicate the roll or bank of the aircraft. 'World-stabilized' and 'head-stabilized' have both been used to indicate symbols which move to remain fixed with respect to external objects. HMDs present unique symbology problems not found in HUDs. Foremost among these is the issue of maintaining spatial orientation of the symbols. All previous flight displays, round dial instruments, HDDs, and HUDs have been fixed in the cockpit. With the HMD, the flight display can move through a large angle. The coordinates use in transforming from the real-world to the aircraft to the HMD have not been consistently defined. This glossary contains terms relating to optics and vision, displays, and flight information, weapons and aircraft systems. Some definitions, such as Navigation Display, have been added to clarify the definitions for Primary Flight Display and Primary Flight Reference. A list of HUD/HMD related abbreviations is also included.
Document ID
20020064448
Acquisition Source
Ames Research Center
Document Type
Other
Authors
Newman, Richard L.
(Crew Systems Consultants San Marcos, TX United States)
Allen, J. Edwin W.
Date Acquired
August 20, 2013
Publication Date
October 1, 1997
Subject Category
Administration And Management
Report/Patent Number
Crew-Systems-TR-97-17
AFDD/TR-98-A-005
Funding Number(s)
PROJECT: RTOP 581-31-22
CONTRACT_GRANT: NAS2-14151
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available