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This Defense Intelligence Reference Document, dated 15 December 2010, is a Defense Intelligence Agency report from its Advanced Aerospace Weapons System Applications (AAWSA) Program. It looks at how many unmanned spacecraft one human pilot could control during future deep-space missions, drawing on research into air traffic control and piloting of multiple unmanned vehicles. It concludes that the limits are about 16 craft for simple tasks, 7 for moderately complex tasks and 4 for complex mixed fleets. It adds that physiological measures can signal when an operator is overloaded.
“Mission Control”7 pages
UNCLASSIFIED/ /F81il 8FFI1il.tzk Wili 8Hklf crash any planes in any of the scenarios - this required approximately 6 hours of practice per participant before the experiment was conducted. Only one of the eight controllers in the Brookings study rated the overload condition as a loss of situational awareness. The results compared the TLX, primary task performance, and physiological measures to low, medium, and high workload conditions, as well as the max or overload condition. Primary task performance is represented in Figure 4 (this chart was recreated visually from the source chart to accurately represent all trends), showing a trending effect for complexity but not volume. Additional results showed that changes in task difficulty (volume or complexity) produced changes in TLX, eye blink rate, respiration rate, and the EEG power spectra. The EEG power spectra were different for changes in volume versus changes in complexity. There were no observed significant correlations with heart rate or heart rate variability. The authors conclude that psychophysiological data can be used to accurately measure workload in real-time, an observation they note confirms earlier work on F4 crew members performing flight tasks of modulated complexity. 32 The Brookings data was reanalyzed by Wilson in 2003 using an artificial neural network approach as well as a stepwise discriminate analysis to classify a physiological state as either operational or overloaded. Wilson successfully classified the overload condition consistently in more than 98% of the cases. The authors admit an issue with psychophysiological variation (day-to-day) that would need to be normalized and further research is required. 33 100 ,-----==---------------;=====.-- 80 60 40 20 0 1-~- Low Medium High Workload □ Volume ■ Complexity □ Overload Max Figure 4. Representation of Performance Results from Brookings Study. 30 Shown are the three scenarios with modulation of traffic volume, complexity, and the overload condition. Note that the Low workload entry for the volume modulation performance (6 planes) was already 80% and this was similar to the 12-plane medium complexity performance. Only the low complexity, 12-plane scenario showed near 100% primary task performance. 13 UNCLASSIFIED//509 QFFI&I.«1k W8& 8HLV
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Report, from the dia collection. The PDF is mirrored here; the original link is above. 31 pages are in the text index: search them above, or from the library's search.