Documents / Official release
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/ /FOA QFFI@IAL l:l!H! 9HLY Chapter 3: Studies in Cognitive Workload for Air Traffic Controllers There are a few areas of research applicable as analogues to the piloting of several aircraft. The largest of these areas analyzes the supervisory functions of air traffic controllers (ATC). In a typical ATC duty environment, a single operator is responsible for many fully-autonomous aircraft. ATC is either airport- based or en-route. Airport based facilities include ground control, local control for active runways (Tower control), and approach control, which in the US is called Terminal Radar Approach Control, or TRACON. A zone of air-controlled space assigned to a specific control center is that center's sector; similarly, a given controller is responsible for a sector of airspace. Between airport-controlled sectors, aircraft are monitored by an en-route facility. TRACON is the most cognitively demanding function in this chain. Terminal controllers, as ATCs are called at TRACON facilities, are responsible for departures after take-off, and approaches and flyovers within about a SO-mile radius of the airport.9 Approaching aircraft need to be vectored by the controller into an appropriate flight path for landing, avoiding all other aircraft in the air or soon to be in the air, and then handed off to the Tower controller for landing and ground instruction. Departing flights and flyover traffic mainly need to be monitored for conflicts. Approaching aircraft are by far the most cognitively challenging in the ATC task. Images of air traffic controller environment and displays are shown in Figure 3.h Errors in flight control are called anomalies in the industry. The most common aircraft anomaly is deviation from flightpath in en-route sectors. This anomaly is corrected by pilots themselves or after instruction from the appropriate ATC. The most common ATC error is miscommunication between controllers in an aircraft handoff between sectors. 19 A study in 1997 by the National Academies showed that ATC errors occurred in both high and low workload conditions, as predicted by overload and disengagement. 20 In looking at the cognitive limits in ATC, we should seek where typical controllers enter the B region of workload. Traffic load defined as simply the number of aircraft does not by itself show the complete picture of ATC workload. In a study of professional controllers in 2006, Boag recorded subjective measures of workload and reaction time when static air traffic displays were presented. Displays included air traffic conflicts of differing complexity that required resolution. Complexity in the display was objectively ranked using the Method of Analysis of Relational Complexity (MARC). 21 Results showed that a relatively small number of aircraft can greatly increase the perceived workload. Boag concludes that perceived complexity is the number one factor in determining workload, and that although conflicts are the major source of complexity in the ATC task, and these can be modeled somewhat using a combination of aircraft separation and trans ition 1 variables, individual differences still have significant impact on when a controller may reach overload. 22 9 Each facility will vary in TRACON sector radius. For smaller airports, TRACON functions may be performed by a nearby en-route fac ility. h Of historical note in the US Air traffic Control industry was the industry -wide strike begun on August 3, 1981, by the nearly 13,000 ATC specialists. Only 1300 obeyed a Presidential order to return to work under the " peril to national safety" provision of the 1947 Taft-Hartley Act. On August 5, 1981 the remaining 11,345 controllers were fired and banned for life from federal service. The FAA rebuilt the force to pre-strike levels during the rest of the 1980s. This event resulted in a dearth of research during the 1980s on air traffic control professionals. 1 An aircraft transition is an event such as landing, hand -off to another controller, or entering/leaving a sector, where a sector is defined as a controller's airspace of responsibility. UNCLASSIFIED/ /FAR AEEICl\k W&li 8HLY 8
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Official release, from the pursue 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.