AN/FST-2

AN/FST-2. The AN/FST-2 was a critical data processing and transmission system integral to the Cold War-era Ballistic Missile Early Warning System (BMEWS). Developed by the United States Air Force to automate threat assessment, it processed raw radar data from distant sites and transmitted formatted track data to command centers like North American Aerospace Defense Command (NORAD). This system represented a major advancement in Strategic Air Command's automated command and control network, significantly reducing the time between detection and response to a potential ICBM attack.

Overview

The primary function was to receive, correlate, and format data from the long-range search radars at BMEWS sites, such as those at Thule Air Base in Greenland, Clear Air Force Station in Alaska, and RAF Fylingdales in the United Kingdom. It translated raw radar returns into standardized track messages suitable for interpretation by downstream systems at the NORAD Cheyenne Mountain Complex. This process was vital for providing the National Command Authority with a coherent and timely picture of a potential nuclear threat, feeding into the broader World Wide Military Command and Control System.

Development and deployment

Development was initiated in the late 1950s by the USAF's Rome Air Development Center with IBM as a principal contractor, following the establishment of BMEWS by the Department of Defense. The system was engineered to address the limitations of manual plotting and voice reporting, which were deemed too slow for the ICBM threat. Initial operational capability was achieved in the early 1960s, with the first systems deployed to support the BMEWS radar at Thule Air Base. Subsequent deployments followed at Clear Air Force Station and RAF Fylingdales, integrating each site into a unified warning network.

Technical specifications

The system was a large-scale, solid-state computer system utilizing early transistor technology and magnetic core memory. It processed data from radars like the AN/FPS-50 and AN/FPS-49, performing functions such as track initiation, correlation, and prediction. Processed data was transmitted via secure Teletype and later digital data links over circuits provided by the Defense Communications System. The hardware was housed in environmentally controlled buildings at each BMEWS site and required significant logistical support from units like the Air Force Communications Service.

Operational history

Throughout the 1960s and 1970s, it formed the computational backbone of BMEWS, operating continuously to monitor the northern approaches to North America and UK. It was a key component during periods of heightened tension such as the Cuban Missile Crisis and numerous routine alerts. The system's automated reporting was crucial during incidents like the 1960 Thule Air Base BMEWS false alarm, where its data was part of the information flow assessed by NORAD. It remained in service until being superseded by newer systems like the AN/FYQ-93 in the 1980s as part of ongoing modernization efforts for the Space Surveillance Network.

Variants and upgrades

The primary configuration was the Baseline AN/FST-2, but incremental improvements were made throughout its service life to improve processing speed, memory capacity, and reliability. These upgrades were often tied to broader BMEWS improvement programs managed by the Air Force Systems Command. A significant evolutionary step was the development of the AN/FYQ-93 Data Processing Subsystem, which eventually replaced it. The technology and operational concepts pioneered directly influenced later United States Space Force and Missile Defense Agency systems for space domain awareness and missile warning.

Category:Military electronics of the United States Category:Cold War military electronics Category:Radar Category:Ballistic missile early warning