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Section 3.4.3

Theory

In long and fairly complex reports and articles, especially theoretical and experimental reports wherethe purpose of the document is to apply, verify, or illustrate oneor more theories, include a separate section presenting relevanttheoretical formulae and the techniques by which any experimental results are predicted. Whenintroducing equations, be sure to define all symbols used in them.


Attitude Display Implementation

The graphics display created for this experiment presented attitude information to the pilot in theHMD [helmet-mounted display]. For the purpose of the experiment, no other information (e.g.,airspeed, altitude) was presented during the actual data collection. The attitude display consistedof a pitch ladder, velocity vector symbol, and waterline symbol (fig. 3).

With the conformal attitude presentation, the appearance of the displayed information wasdependent on the head position of the pilot. The displayed horizon line of the attitude symbology,if it was in view, would always overlay the horizon of the outside scene. If the line of sight of thepilot was not aligned with the body axis of the airplane, the attitude of theairplane . . . could not always be easily obtained from the displayedsymbology.

With the body-axis concept, no matter which direction the pilot moved his head, the display appearedas if the pilot was looking directly out the front of the airplane. In essence, the body-axis conceptwas analogous to physically mounting a HUD [head-up display] to the helmet. With this concept,the pilot could always directly determine the attitude of the airplane. However, in situations wherethe line of sight of the pilot was not aligned with the body axis of the airplane, the displayed horizonline of the attitude symbology, if it was in view, would not overlay the horizon of the outsidescene.

--D. Jones et al., "Concepts for Conformal and Body-Axis Attitude Information for SpatialAwareness Presented in a Helmet-Mounted Display," National Aeronautics and SpaceAdministration


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