AAWSAP DIRD, Cognitive Limits on Simultaneous Control of Multiple Unmanned Spacecraft, December 2010

This Defense Intelligence Reference Document, DIA-08-1101-001, is dated 15 December 2010. The Defense Intelligence Agency's Defense Warning Office produced it under the Advanced Aerospace Weapons System Applications program. It asks how many unmanned spacecraft one pilot could control in a future deep-space fleet, drawing on air traffic control and multiple unmanned vehicle research. It concludes the limits are about 16 craft for simple tasks, 7 for moderately complex ones and 4 for complex heterogeneous craft. It adds that physiological measures can signal operator overload.

From the source: Release of 2026-09-18 Incident: 12/15/10, Las Vegas, Nevada. Released with redactions. This document is a Defense Intelligence Reference Document (DIRD), a technical reference format used by the Defense Intelligence Agency (DIA) to capture baseline knowledge on a specific topic for later analytic use. DIRDs are best understood as reference and synthesis products rather than as original research. It is one of 38 DIRDs produced under the Advanced Aerospace Weapon System Applications Program (AAWSAP) between 2009 and 2011. Because AAWSAP’s scope permitted a broad range of supporting topics, not every DIRD in the series directly concerns aerospace systems or future threat assessment. The following summary reflects the DIRD’s scope and framing at the time of writing and should not be read as implying current validation of the concepts discussed. This DIRD examines how many unmanned spacecraft a single human operator could realistically supervise or control at once, using research from air traffic control and multi-vehicle remote piloting as rough analogs. The report argues that the practical limit depends heavily on task complexity: about 16 craft for simple monitoring or destination assignment, about 7 for moderately complex piloting or mission tasks, and about 4 for complex heterogeneous operations. It places particular emphasis on the operator’s ability to maintain a coherent mental “big picture” of multiple vehicles at once, and it suggests that automation and external displays can help by offloading working-memory demands, though not eliminating them. The document also highlights physiological workload measures as a possible way to detect or predict operator overload in real time. Overall, it presents multi-spacecraft control as a human-factors and systems-integration problem in which progress depends on managing cognitive limits through interface design, automation, and workload monitoring.

UNCLASSIFIED/ /FOR OSSICIAl WSE 8HLY
audio processing, and this is where multiple resource theory enters: different resources
can be considered independent if demands on one resource do not tax the availability of
capacity of the other. Performance of a task can be high or low: in general if spare
capacity is available, performance is high, and if capacity is limited or exceeded,
performance is low. Moreover, task demand enforces a fixed theoretical relationship
between mental workload and task performance: this is shown in Figure l.
Relationship between Workload and Task Performance
High Performance
Workload
Low
D Al A2 A3 B C
Task Demand
Figure 1. One-dimensional Representation of Changes in Performance
as Workload Varies. Task demand increases to the right. In the three A
regions, performance remains unchanged : A2 is optimal, where a trained
operator exerts minimal effort to maintain a set level of performance. At times
of low demand the operator exerts effort to maintain vigilance (Al) until
demand is so low, the subject disengages from the task (D). The workload curve
is not well defined at very low levels of demand (dotted lines). At the other end,
as demand increases, the subject can exert effort to keep up with demand (A3) .
Additional effort maintains performance until degradation begins (B), and in the
overload condition, region C, performance is degraded beyond acceptable levels.
While effort is maintained in overload, some low level of performance exists.
UNCLASSIFIED/ /FOR OFFI@IAI: WSE OHl:l/
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