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Night view of the COBRA DANE radar

The AN/FPS-108 COBRA DANE is a PESA phased array radar installation operated by Raytheon for the United States Space Force (originally for the United States Air Force) at Eareckson Air Station on the island of Shemya, Aleutian Islands, Alaska.[1] The system was built in 1976 and brought online in 1977 for the primary mission of gathering intelligence about Russia's ICBM program in support of verification of the SALT II arms limitation treaty. Its single face 95 ft (29 m) diameter phased array radar antenna 52°44′14″N 174°05′29″E / 52.7373°N 174.0914°E / 52.7373; 174.0914 faces the Kamchatka Peninsula and Russia's Kura Test Range. COBRA DANE operates in the 1215–1400 MHz band and can track items as small as a basketball sized drone at distances of several hundred miles.[2]

The "COBRA" designation indicates a general Defense Intelligence program[3] and, in accordance with the Joint Electronics Type Designation System, the "AN/FPS-108" designation represents the 108th design of an Army-Navy fixed radar (pulsed) electronic device for searching.[4][5]

Description

[edit]

It initially employed a Control Data Corporation Cyber 74 mainframe computer for data processing.[6] Data from the radar is sent to the North American Aerospace Defense Command (NORAD) at Peterson Space Force Base, Colorado. It is also listed as a partner of the NASA Orbital Debris Program Office and works with the Missile Defense Agency,[1] under the control of the 21st Operations Group.[7]

The Cobra Dane radar has been upgraded to be integrated in the Missile Defense Agency's (MDA) Ballistic Missile Defense System (BMDS). The improvement includes midcourse BMDS sensor coverage by providing acquisition, tracking, object classification, and data that can be used for cueing, launch of interceptor missiles, and course updates of interceptors while retaining the site's legacy intelligence and space track missions. The Space Force maintains responsibility for the Cobra Dane radar operations, maintenance, and sustainment.[8]

Technical specifications

[edit]
  • Traveling wave tube l-fed phased-array, all-weather, long-range radar
  • Provides midcourse coverage for the Ballistic Missile Defense System. Detects sea-launched or intercontinental ballistic missiles; Classifies reentry vehicles and other missile objects. Provides real-time information to Fire Control.
  • Provides tracking of threat ballistic missiles sufficiently accurate to commit the launch of interceptors and to update the target tracks to the interceptor while the interceptor is in flight
  • Has one radar face providing 136° of azimuth coverage. The radar face is approximately 95 feet (29 metres) in diameter; overall radar height is 120 feet (37 metres). Detects objects out to 2,000 miles (3,200 kilometres). It operates in the L-band frequency.[9]

See also

[edit]
Displays for the COBRA DANE system, 1977
Personnel inside the data processing center, June 1977

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Cobra Dane

View on Grokipedia
from Grokipedia
The AN/FPS-108 Cobra Dane is a ground-based, L-band, (PESA) system operated by the at on Island, . It features a single 95-foot-diameter face providing 136 degrees of coverage and is designed for long-range detection and precise tracking of ballistic missiles, satellites, and airborne targets up to 2,000 miles distant. Developed by in the 1970s as a Cold War-era asset to monitor Soviet missile tests and replace older mechanical radars, Cobra Dane achieved initial operational capability in 1977 and has since supported missions including collection for verification, midcourse defense surveillance, and . The system can simultaneously track up to 200 objects, including those as small as a at several hundred miles, delivering metric and signature data to entities such as and U.S. Strategic Command. Ongoing sustainment efforts, including multi-million-dollar contracts for operations, maintenance, and upgrades, have preserved its relevance against modern threats, with recent initiatives focusing on enhanced and boundary interfaces as of 2025. Cobra Dane's strategic positioning near the western approaches to enables comprehensive coverage of launch corridors from , underscoring its enduring role in national defense without notable operational controversies.

History

Development and Construction

The AN/FPS-108 Cobra Dane radar system originated from U.S. efforts to monitor Soviet ballistic missile tests during the Cold War, with roots tracing to the Rome Air Development Center's (RADC) early phased-array research initiated as far back as 1955 under the SARAC program. In February 1972, Headquarters U.S. Air Force formally assigned technical engineering oversight to RADC to develop a dedicated surveillance radar for tracking intercontinental ballistic missiles (ICBMs) and submarine-launched ballistic missiles (SLBMs) launched toward impact areas in Kamchatka and the Pacific Ocean. Raytheon was selected as the prime contractor following competitive requests for proposals issued to industry. The development contract was awarded in June 1973, focusing on a large L-band (1215-1400 MHz) phased-array to provide high-resolution metric and signature data for purposes. Construction occurred at on Island, , selected for its proximity to Soviet test ranges and orientation toward potential launch trajectories. RADC provided ongoing technical assistance through the Electronic Systems Division during site preparation and array assembly, which featured a 29-meter single-faced antenna. The system was completed in 1976, with testing commencing that October. Cobra Dane achieved initial operational capability and was formally transferred to in July 1977, enabling real-time tracking to support verification and strategic intelligence collection. The radar's design emphasized reliability for remote operation, contributing to its long-term sustainment despite the challenging Aleutian environment.

Initial Deployment and Cold War Role

The AN/FPS-108 Cobra Dane radar system, developed by under a awarded on June 6, 1973, was constructed on Island in the Aleutian chain of to replace earlier AN/FPS-17 and AN/FPS-80 radars at what was then Shemya Base (later redesignated ). Construction was completed by late 1976, with initial testing commencing in October 1976, marking the transition to a advanced phased-array capability optimized for long-range surveillance over the North Pacific. The system achieved initial operational capability in July 1977, entering service as the most powerful single-faced phased-array radar of its era, operating in the L-band (1215-1400 MHz) with a 29-meter antenna face directed toward Soviet territory. During the Cold War, Cobra Dane's primary function was to provide real-time tracking and intelligence collection on Soviet (ICBM) and (SLBM) tests launched from sites in the eastern USSR, particularly those impacting the , enabling verification of treaties such as SALT II. It supported early warning against potential sea-launched ballistic missile threats and contributed to the Air Force's Spacetrack system by cataloging space objects, including Soviet launches, thereby enhancing U.S. assessments of adversary capabilities without reliance on less precise over-the-horizon or airborne sensors. Operational data from the fed into national command centers, informing strategic deterrence postures amid escalating tensions, though its fixed, forward-facing design limited coverage to specific threat vectors from . The system's endurance in harsh Aleutian conditions underscored its role in maintaining continuous surveillance, with minimal downtime reported during peak Soviet testing periods in the late 1970s and 1980s.

Post-Cold War Transitions

Following the in 1991, the AN/FPS-108 Cobra Dane radar experienced operational adjustments driven by reduced strategic threats and budgetary constraints within the U.S. military. Its primary mission of monitoring Soviet tests diminished in priority, leading to the elimination of its dedicated role in the Space Surveillance Network (SSN) in April 1994 to achieve cost savings. Operations were scaled back to a reduced of 1.5%—one-quarter of its previous 6.0%—lowering average power output while maintaining the capability to surge to full power in under 30 seconds if needed, thereby saving approximately $5 million annually. By the late 1990s, evolving requirements prompted partial reconnection to the SSN in October 1999 following evaluation tests, though full-power continuous operations remained limited. A significant shift occurred in March 2003, when additional funding from Space Command enabled resumption of continuous full-power operations, with an enhanced emphasis on space surveillance, including tracking orbital and uncataloged objects via a newly implemented wide-area search fence. This transition aligned Cobra Dane more closely with objectives, expanding its catalog capacity from 5,000 to 12,000 space objects and integrating it as a key sensor in the SSN for low-Earth orbit monitoring. Command and ownership evolved to reflect these mission changes. In 2014, responsibility transferred to Air Force Space Command (now U.S. ), marking a formal alignment with space-focused operations under the . Concurrently, upgrades in 2004 enhanced its contributions, positioning it as a frontline asset for detecting sea-launched and intercontinental ballistic missiles, classifying re-entry vehicles, and supporting integration. By 2015, sustainment strategies were approved to address aging infrastructure, while missions broadened to include deep-space tracking and automatic transitions to mode upon threat detection. These adaptations ensured Cobra Dane's continued relevance amid post-Cold War fiscal pressures and emerging threats from non-Russian actors.

Technical Specifications

Radar Architecture

The AN/FPS-108 Cobra Dane employs a single-faced, fixed (PESA) design, enabling electronic without mechanical rotation. This architecture consists of a large planar mounted on a stationary structure, with phase shifters controlling the signal phase across elements to form and direct the radar beam. The system operates in the L-band frequency range of 1215-1400 MHz, utilizing linear for to achieve high range resolution. The antenna face measures 29 meters (95 feet) in and incorporates 34,768 total elements, of which 15,360 are active radiating elements fed by a corporate power distribution network. Inactive elements serve as fillers to maintain the array's structural integrity and uniform . The design provides 136 degrees of coverage, originally limited to ±60 degrees but later expanded through modifications to the beam-forming network. Signal processing in the architecture supports multiple modes, including for long-range detection and (up to 200 MHz bandwidth with 1 ms pulses) for precise tracking of ballistic missiles and reentry vehicles. The transmitter subsystem delivers high peak power distributed across the active elements, while receivers handle returns with low noise figures to detect small radar cross-section targets at extended ranges. This configuration prioritizes simultaneous multi-target tracking, leveraging the phased array's inherent capability for rapid beam repositioning.

Detection and Tracking Capabilities

The AN/FPS-108 Cobra Dane is a single-faced, L-band operating in the 1175-1375 MHz range, enabling long-range detection and high-volume tracking of airborne and space objects through electronic without mechanical movement. This architecture supports simultaneous observation of multiple targets by dividing the array into subarrays for independent beam formation, providing metric data on position, , and for ballistic missiles, , and orbital debris. In its primary role, Cobra Dane detects and tracks (ICBM) launches over a horizon-limited range exceeding 3,200 kilometers (2,000 miles), delivering midcourse tracking data with sufficient accuracy for target and interceptor cueing. The system's 29-meter (95-foot) aperture yields angular resolution on the order of 1-2 degrees, allowing discrimination of warhead clusters from decoys during reentry phases, though L-band limits fine-range resolution compared to higher-frequency radars. For , Cobra Dane extends detection to at up to 46,000 kilometers, capable of identifying and cataloging objects as small as 4-5 centimeters in diameter across a 120-degree azimuthal sector with coverage from horizon to . Post-2000 upgrades enhanced autonomous fence-tasking for newly detected low-earth objects, enabling real-time track initialization and handover to global networks without operator intervention. The maintains continuous volumes by scanning up to 60 degrees off boresight, prioritizing high-velocity threats while queuing hundreds of tracks per minute.

Site and Infrastructure


The AN/FPS-108 Cobra Dane radar is located at on Island, , in the western chain, approximately 1,200 miles southwest of Anchorage and strategically positioned near the . The installation occupies the northwest corner of the air station, optimizing its field of view for surveillance across the North Pacific and regions. The core infrastructure centers on a fixed, ground-based phased-array antenna with a single face approximately 95 feet in diameter, containing 15,360 L-band (1175-1375 MHz) radiating elements covering about 100 by 100 feet. Construction of the facility began in the mid-1970s under U.S. Program 633A, achieving operational status in August 1977 after replacing earlier detection radars like the AN/FPS-17 and AN/FPS-80. The structure houses transmit/receive modules, equipment, and environmental controls suited to the island's , including high winds, , and seismic activity common to the region. Supporting systems integrate with utilities for prime power generation and potable water distribution, ensuring self-sustained operations in this remote, austere environment lacking mainland connections. Communication infrastructure encompasses local networks alongside wide- and narrow-band links for real-time data relay to command centers, complemented by an on-site operations and complex for maintenance, calibration, and preliminary . Logistical access relies on the air station's airfield, which facilitates personnel rotations, equipment deliveries, and sustainment in an area closer to than to continental .

Operational Roles

The primary functions of the AN/FPS-108 Cobra Dane phased-array radar at Eareckson Air Station include ballistic missile early warning, space object tracking, and integration with missile defense systems.

Missile Defense Functions

The Cobra Dane radar, located at on Island, , functions as a key in the U.S. defense system by providing midcourse coverage and early warning against intercontinental ballistic missiles (ICBMs) and submarine-launched ballistic missiles (SLBMs). It detects launches from regions including , tracks trajectories up to 2,000 miles, and supplies precise metric and signature data during exo-atmospheric and early endo-atmospheric phases to support threat assessment and interceptor commitment decisions. Upon detection of a potential threat, the system automatically transitions to mode or responds to alert messages from U.S. Strategic Command, enabling real-time classification of reentry vehicles, discrimination of warheads from decoys and other objects, and tracking of up to 200 targets simultaneously. This data feeds into broader networks, contributing to verification of missile attacks and informing defensive responses for the U.S. and allies. As a ground-based L-band phased-array radar, Cobra Dane's capabilities emphasize long-range surveillance and discrimination essential for layered , though its fixed orientation limits coverage to specific threat vectors from the western Pacific.

Space Domain Awareness

The AN/FPS-108 Cobra Dane contributes to (SDA) by tracking satellites, orbital debris, and resident space objects, providing critical data for monitoring the space environment. Its phased-array design enables simultaneous detection and recording of multiple objects, supporting the U.S. Space Force's efforts to characterize space threats and maintain . Operated within the SDA Operations Cell, the system delivers narrowband radar metrics essential for Space Object Identification missions under U.S. Strategic Command. As a secondary mission alongside ballistic missile defense, Cobra Dane has evolved to include enhanced space surveillance capabilities, including data on foreign satellite launches and debris conjunction assessments. Under Space Delta 4's 13th Space Warning Squadron, it integrates with broader SDA networks to track objects up to 2,000 miles distant, aiding in the identification of over 9,500 cataloged space objects when combined with other sensors. The radar's L-band operations offer persistent coverage from its Aleutian Islands location, uniquely positioned for Indo-Pacific space monitoring. Recent sustainment efforts, including a $62 million contract awarded in April 2025 to V2X Inc., ensure Cobra Dane's reliability for SDA tasks amid growing orbital congestion and adversarial activities. Modernization initiatives focus on resilience and upgrades to handle increasing space traffic, with the system providing verifiable metrics on object orbits and maneuvers. These contributions underscore its role in mitigating collision risks and supporting international space safety protocols, though primary emphasis remains on national defense priorities.

Integration with Broader Defense Systems

The AN/FPS-108 Cobra Dane radar feeds real-time tracking data on ballistic missiles and space objects to the at the Operations Center, enabling early warning and aerospace defense assessments. This integration supports NORAD's mission to monitor air and missile threats approaching , with Cobra Dane's L-band phased-array capabilities allowing simultaneous tracking of up to 200 targets for detailed parametric data transmission. As a key sensor in the Missile Defense Agency's (MDA) Defense System (BMDS), Cobra Dane delivers midcourse phase coverage, automatically shifting to missile defense mode upon threat detection or alert receipt to provide cueing data for interceptors and other BMDS elements like . Following its 2004 upgrades, the system was explicitly incorporated into BMDS operations, enhancing discrimination and tracking of (ICBM) threats originating from the Pacific region. Cobra Dane also contributes to U.S. Space Command's (USSPACECOM) space domain awareness through data sharing with the Combined Space Operations Center (CSpOC), formerly the Joint Space Operations Center (JSpOC), as part of the broader U.S. Space Surveillance Network. This linkage supports cataloging and conjunction assessments for over 27,000 space objects, with radar metrics transmitted via secure channels including the Defense Satellite Communications System (DSCS) for integration into command-and-control architectures. Overall, these connections position Cobra Dane as a multi-mission node bridging missile warning, defense, and space surveillance under unified U.S. Strategic Command oversight.

Upgrades and Modernization

Major Upgrades

The AN/FPS-108 COBRA DANE radar underwent a comprehensive modernization program, known as the COBRA DANE System Modernization (CDSM), initiated in 1990 with a $60 million investment by the U.S. Air Force. This four-year effort addressed aging and unsupportable components by replacing the receiver/waveform generator, digital pulse compression unit, all automated data processing equipment (ADPE), and recording peripherals with modern commercial off-the-shelf (COTS) hardware. Operations software was rewritten and enhanced using the ADA programming language, while dual redundant VAX 6000-520 mainframes (each providing 13 million instructions per second) were installed to boost mission reliability; the transmitter, array, and facilities subsystems largely remained intact. The program concluded in 1993, with full operational transition by spring 1994, extending the system's viability and improving data processing for missile and space object tracking. A subsequent major upgrade in 2003–2004 integrated COBRA DANE into the Missile Defense Agency's (MDA) Ballistic Missile Defense System (BMDS), shifting its role from primary intelligence gathering to active support for operations. This enhancement restored full-power operation—resumed in 2003 after prior reductions—and enabled the radar to provide cueing for interceptor launches, precise target tracking, and discrimination of reentry vehicles during foreign tests. The Cobra Dane (CDU) was completed in 2004, allowing participation in integrated ground tests and live tracking of actual launches, marking the first MDA-transferred capability to the U.S. . Additional upgrades have focused on space surveillance, expanding the radar's catalog capacity from 5,000 to 12,000 space objects and enhancing early warning for orbital threats up to 2,000 miles away. These improvements, implemented progressively since the 1990s modernizations, leverage the L-band phased-array's inherent strengths in detecting small objects like basketball-sized drones at hundreds of miles, supporting broader missions amid evolving threats from debris and adversarial satellites.

Recent Developments and Contracts

In August 2025, the U.S. issued a seeking industry proposals to modernize the AN/FPS-108 Cobra Dane radar's backend systems, including 1970s-era beam steering computers and data processors, as part of an estimated nearly $1 billion effort to enhance resilience and operational capability against evolving threats. This initiative addresses the radar's age—operational since 1977—and aims to sustain its roles in missile warning and space surveillance without replacing the core phased-array antenna. On April 10, 2025, V2X Inc. received a $62 million to maintain operational readiness of the , building on prior sustainment work to ensure continuous tracking of ballistic missiles and space objects from , . A March 28, 2025, modification awarded Vertex Aerospace LLC $62,184,592 under agreement FA8723-18-D-0003 for Cobra Dane life-cycle sustainment, focusing on and support to uphold availability amid remote site challenges. These awards reflect ongoing U.S. priorities to incrementally upgrade legacy sensors rather than full replacement, prioritizing cost-effective enhancements to counter peer adversaries' hypersonic and proliferated space threats.

Strategic Significance

Geopolitical and Threat Context

The AN/FPS-108 Cobra Dane radar, situated on Shemya Island in 's Aleutian chain, occupies a forward position approximately 1,500 miles southwest of mainland and closer to Russia's Kamchatka Peninsula than to U.S. territory, enabling persistent surveillance of Pacific and approaches. Originally deployed in 1977 to gather intelligence on Soviet (ICBM) and (SLBM) tests targeting Kamchatka impact zones, it addressed the primary geopolitical threat of the era: massive Soviet nuclear arsenals capable of striking the U.S. homeland via northern trajectories. This positioning exploited the island's proximity to adversary launch sites, providing real-time data on missile signatures, trajectories, and reentry vehicle performance to inform U.S. deterrence and defense strategies. In the post-Cold War period, evolving threats from resurgent adversaries have amplified Cobra Dane's relevance, particularly Russia's modernization of its , including Borei-class submarines conducting SLBM patrols in the and , which could threaten U.S. assets via polar routes. Russian hypersonic glide vehicles and , tested over trajectories observable from , underscore the radar's role in tracking advanced countermeasures-evading threats that challenge traditional defenses. Similarly, China's expanding ICBM force and developments, potentially routing over the , necessitate Cobra Dane's L-band phased-array capabilities for early detection and cueing to interceptors. North Korea's repeated ICBM tests, including lofted trajectories simulating U.S. mainland strikes, further highlight the system's utility in monitoring provocative launches from the theater. Geopolitically, Cobra Dane bolsters U.S. posture amid an "axis of aggressors" comprising , , , and , whose coordinated advancements in technology erode strategic stability and increase escalation risks during crises. Its integration into U.S. Command operations counters 's militarization and incursions, while deterring preemptive strikes by rendering adversary activities transparent and vulnerable to options. As a high-value asset, hosts exercises to defend against raids, reflecting assessments that adversaries view the radar as a priority target in high-intensity conflict to blind U.S. warning networks. Upgrades since 2004 have shifted its focus from pure intelligence to active support, aligning with broader efforts to adapt to peer competitors' asymmetric capabilities.

Contributions to U.S. National Security

The AN/FPS-108 Cobra Dane radar, operational since 1977 on Shemya Island, Alaska, has provided essential contributions to U.S. national security through its role in ballistic missile early warning and defense. Designed initially for intelligence collection on Soviet missile tests, it detects intercontinental ballistic missiles (ICBMs) and submarine-launched ballistic missiles (SLBMs) launched toward North America, classifying reentry vehicles and associated objects during exo-atmospheric and early endo-atmospheric phases. This capability delivers midcourse tracking data to the U.S. Ballistic Missile Defense System (BMDS) and Ground-Based Midcourse Defense (GMD) architecture, enabling potential intercepts and informing strategic responses to threats from Pacific vectors, particularly Russia and China. Cobra Dane enhances space domain awareness as a key sensor in the Space Surveillance Network (SSN), tracking up to 200 objects simultaneously, including satellites and orbital debris, at ranges exceeding 46,000 km. Its phased-array design supports simultaneous surveillance of multiple threats, relaying precise metric and signature data to the North American Aerospace Defense Command (NORAD) and U.S. Strategic Command for real-time threat assessment. Upgrades in 2004 integrated it into missile defense operations, expanding from Cold War-era telemetry intelligence to active contributions in countering modern hypersonic and maneuvering reentry vehicle challenges. By maintaining persistent vigilance over adversarial missile activities and space launches, Cobra Dane bolsters deterrence and operational readiness, reducing response times to potential attacks on U.S. territory and assets. Its strategic positioning offers unique coverage of northern Pacific launch sites, complementing other sensors and mitigating gaps in networks critical for national defense.

References

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