During the 2011 Desert Research and Technology Studies (D-RATS) field tests, NASA and Honeywell conducted a series of special standalone demonstrations of two different heads up display technologies that are being considered for incorporation into the next generation spacesuit. These were conducted in anticipation of the need to provide a robust informational system that will facilitate increased crewmember autonomy by providing them an expanded set of information through visual and other means. This information includes but is not limited to life support system status information, navigational instructions, emergency alarms, and procedures. The two technologies tested were quite distinct from one another. One was a see-through display using a sophisticated waveguide and laser light source, and the other was a direct view, fully occluded display using more conventional LCD display technology. Since no spacesuits were used during these demonstrations, both displays were packaged in head worn goggles. Quantitative and qualitative data relating to perceived resolution and contrast was collected and analyzed for each device. Evaluations of the hardware started with notional status displays used during walkarounds, and were followed with performance of procedures that used Apollo heritage mockup hardware. A viewfinder function was also evaluated for each device. Questionnaires were administered to capture user opinions and perceived workload. The testing yielded numerous specific findings and increased confidence that heads up display technology will be appropriate in the future spacesuit. While both devices successfully delivered information to the users, and there was no obvious consensus as to which display type was preferred, the recommendation is that near-term future development testing focus on a see-through solution. This is due to the belief that see-through displays have many advantages, while their shortcomings can be overcome through future design enhancements.
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