Air Defense

TPY-4

Also known as
  • AN/TPY-4
  • AN/TPY-4 radar
  • TPY-4 radar

Lockheed Martin's TPY-4 is a U.S. ground-based, multi-mission air-surveillance radar developed for the Air Force 3DELRR program. The fully digital, software-defined radar can be fielded in fixed or mobile configurations, and official procurement records now tie it to U.S. Air Force production, Norway's 11-radar air-surveillance chain, Sweden's PS-861 replacement program, and Denmark's planned North Atlantic air-warning sites.

TPY-4, Ground-based multi-mission air-surveillance radar, Air Defense
Image source: TPY-4 | Lockheed Martin
Profile / Specs

Profile

Origin
United States
Type
Ground-based multi-mission air-surveillance radar
Service note
2021-present
Produced
2022-present

Specifications

Radar type
3D element-based digital AESA radar with gallium-nitride transmit/receive technology
Architecture
Fully digital at every element; software-defined radar with distributed, scalable digital beam forming
Frequency band
L-band (1215 to 1400 MHz)
Coverage modes
6 rpm 360-degree rotating search or stop/stare coverage across +/-45 degrees azimuth
Instrumented range
300 nmi / 555 km in rotating mode; 540 nmi / 1,000 km in stop/stare mode
Height and elevation coverage
100,000 ft / 30.5 km height; -6 to 38 degrees search elevation and -6 to 90 degrees track elevation
Mission modes
Air surveillance, low-profile UAS detection, ballistic-missile search and dedicated track, maritime surveillance, and satellite track
IFF and operation
Mode 5 capable; full remote-controlled and unmanned operation
3DELRR configuration
Single-face rotating AESA for the U.S. Air Force Control and Reporting Center weapon system
Transportability
Fixed or highly mobile; transportable by C-130, C-17, truck, rail, or helicopter
Designation
AN/TPY-4(V)1
U.S. program
Three-Dimensional Expeditionary Long-Range Radar (3DELRR), with 2021 contract options for production and fielding of 35 radars
Documented operators and buyers
U.S. Air Force; Royal Norwegian Air Force; Swedish Air Force; Royal Danish Air Force procurement
Norway program
Eleven TPY-4 radars planned for Project 2078, with first operational replacement site scheduled for 2026 and all sites planned by 2030
Sweden procurement
FMV ordered TPY-4 to replace PS-861 long-range radars, with first delivery to FMV planned for 2027
Denmark procurement
Three TPY-4 radars selected for Skagen, Bornholm, and the Faroe Islands, with an option for a fourth radar in Greenland
Radar Architecture And Coverage

Lockheed Martin's TPY-4 brochure and DOT&E's 3DELRR report describe a single-face rotating L-band AESA built around digital beam forming and GaN transmit technology.

Array

3D element-based digital AESA with gallium-nitride technology, supporting software-defined operation and electronically steered search/track modes from a ground transportable radar.

Coverage

360 degrees at 6 rpm, or stop/stare coverage across +/-45 degrees azimuth for focused sector surveillance.

Range envelope

300 nmi / 555 km in rotating mode and 540 nmi / 1,000 km in stop/stare mode, with 100,000 ft / 30.5 km height coverage.

3DELRR role

DOT&E describes 3DELRR TPY-4 as the organic radar for the U.S. Air Force Control and Reporting Center weapon system.

Sources: TPY-4 Multi-Mission Radar brochure; DOT&E FY2022 Annual Report - Air Force - 3DELRR.

Documented Service Context

Official government and industry records show TPY-4 moving from the U.S. 3DELRR program into a Nordic and North Atlantic air-surveillance procurement base.

Operator or buyerStatusSource-backed detail
U.S. Air ForceDelivered / in productionFirst TPY-4 delivery occurred in April 2025; 2026 contract actions added three more 3DELRR systems plus interim support and spares.
Royal Norwegian Air ForceFieldingNorway contracted for eight radars in 2022, later increased the total to 11, and reported the first operational replacement site planned for 2026.
Swedish Air ForceOrderedFMV ordered TPY-4 in June 2025 to replace PS-861 long-range radars, with first delivery to FMV planned for 2027.
Royal Danish Air ForceSelectedDenmark selected three TPY-4 radars for Skagen, Bornholm, and the Faroe Islands, with an option for a fourth radar in Greenland.

Sources: Lockheed Martin Delivers First U.S. Air Force TPY-4 Radar; Contracts for Jan. 16, 2026; Contracts for June 24, 2026; New air surveillance radars to the Norwegian Armed Forces; NATO far skjerpet blikk i nord; FMV tecknar avtal om langrackviddig radar; Lockheed Martin skal levere luftvarslingsradarer i Danmark og pa Faroerne; Denmark Selects Lockheed Martin TPY-4 Radar to Strengthen NATO Deterrence and Regional Defense.

Variants

Public sources use TPY-4 as the product family name, AN/TPY-4(V)1 as the U.S. government designation selected for 3DELRR, and TPY-X for the earlier development/marketing lineage.

VariantConfigurationDesignation notes
AN/TPY-4(V)1U.S. government designation / 3DELRR production configuration

Lockheed Martin announced the official AN/TPY-4(V)1 nomenclature in 2021, and the Air Force selected that configuration in 2022 for the 3DELRR program to replace the TPS-75 radar.

Sources: TPY-4 Radar Earns Official U.S. Government Designation, Setting New Standard in Airspace Threat Detection, 3DELRR to Move Forward with Lockheed Martin's Long-Range Radar System

TPY-XPre-designation development and marketing name

Specialist and missile-defense references describe TPY-X as the earlier L-band, scalable fixed-or-mobile long-range radar concept that preceded the AN/TPY-4 designation.

Sources: TPY-X - Missile Defense Advocacy Alliance, AN/TPY-4 - Deagel

Radar Family Commonality

TPY-4 and Sentinel A4 are separate radars, but Lockheed Martin ties TPY-4 production maturity to common design work across its radar portfolio.

Compatible itemItem typeCompatibility evidence
Sentinel A4, Air and missile defense radar, Air DefenseSentinel A4Air and missile defense radar

Lockheed Martin said TPY-4 production sub-assemblies passed environmental and performance tests on a foundation validated by company investment and commonality with the U.S. Army Sentinel A4 radar.

Sources: TPY-4 Radar Earns Official U.S. Government Designation, Setting New Standard in Airspace Threat Detection

Why that matters

The shared-family context is a design and production relationship, not a compatibility claim that the two radars operate as one system.

Sources: TPY-4 Radar Earns Official U.S. Government Designation, Setting New Standard in Airspace Threat Detection

Timeline

TPY-4 Key Events

  1. U.S. Air Force awards 3DELRR rapid-prototyping contract

    The Air Force awarded Lockheed Martin the 3DELRR rapid-prototyping integration contract, including options for production and fielding of 35 radars.

    Sources: Contracts For Mar. 26, 2021

  2. U.S. government designates AN/TPY-4(V)1

    Lockheed Martin said TPY-4 had received its official U.S. government nomenclature and described the radar as a fully digital long-range sensor.

    Sources: TPY-4 Radar Earns Official U.S. Government Designation, Setting New Standard in Airspace Threat Detection

  3. First TPY-4 completes production

    Lockheed Martin said its first AN/TPY-4 radar had completed production after the U.S. Air Force selected TPY-4 for the 3DELRR program earlier that spring.

    Sources: Lockheed Martin's First TPY-4 Radar Completes Production

  4. Norway selects TPY-4

    Norway's Defence Materiel Agency signed for eight air-surveillance radars with an option for three more; the Norwegian Air Force was named as the radar operator.

    Sources: New air surveillance radars to the Norwegian Armed Forces, Royal Norwegian Air Force Selects the Lockheed Martin TPY-4 Radar to Enhance Homeland Defense

  5. U.S. orders three 3DELRR systems

    The Department of Defense announced a $65.1 million option exercise for three 3DELRR systems under the Lockheed Martin contract.

    Sources: Contracts For Jan. 18, 2024

  6. Risk-reduction testing completes

    Lockheed Martin reported that TPY-4 finished risk-reduction tests for the 3DELRR program and described the radar as one step closer to a fielded capability.

    Sources: TPY-4 Radar Completes Successful Risk Reduction Tests

  7. Norway orders three more radars

    Norway exercised a contract option for three additional TPY-4 radars and completed the program's critical design review on schedule.

    Sources: Lockheed Martin Tapped for Additional Norwegian TPY-4 Radars, Completes Critical Design Review on Schedule

  8. First U.S. Air Force delivery

    Lockheed Martin delivered the first TPY-4 radar to the U.S. Air Force after completing early-phase testing for the 3DELRR program.

    Sources: Lockheed Martin Delivers First U.S. Air Force TPY-4 Radar

  9. Sweden selects TPY-4

    Sweden's FMV signed a TPY-4 agreement to replace the PS-861 long-range radar, with the first system scheduled for delivery to FMV in 2027.

    Sources: FMV tecknar avtal om langrackviddig radar, Sweden Selects the Lockheed Martin TPY-4 Radar to Enhance Regional Deterrence and Defense Capabilities

  10. Denmark selects Lockheed Martin air-warning radars

    Denmark selected Lockheed Martin air-warning radars for Skagen, Bornholm, and the Faroe Islands, with an option for a fourth radar in Greenland.

    Sources: Lockheed Martin skal levere luftvarslingsradarer i Danmark og pa Faroerne

  11. Denmark identified as a TPY-4 customer

    Lockheed Martin identified Denmark's selected radar as TPY-4 and said three radars, with an option for a fourth, would support the Royal Danish Air Force and NATO air defense.

    Sources: Denmark Selects Lockheed Martin TPY-4 Radar to Strengthen NATO Deterrence and Regional Defense

  12. U.S. orders three more 3DELRR systems

    The Department of War announced a $68.5 million modification to produce three additional 3DELRR radar systems under the Lockheed Martin contract.

    Sources: Contracts for Jan. 16, 2026

  13. U.S. adds 3DELRR support and spares

    The Department of War announced an $11.8 million modification for 3DELRR interim contractor support and additional spares, with work expected through May 2028.

    Sources: Contracts for June 24, 2026

Media

TPY-4 Videos

TPY-4 Images

TPY-4, Ground-based multi-mission air-surveillance radar, Air Defense - view 1
Source: TPY-4 | Lockheed Martin
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Sources

TPY-4 | Lockheed MartinPublisher: Lockheed Martin | Note: Supports TPY-4 manufacturer background, ground-based air-surveillance role, product identity, transportability, and the primary/gallery image provenance. | Accessed: 2026-07-04TPY-4 Multi-Mission Radar brochurePublisher: Lockheed Martin | Note: Supports TPY-4 frequency band, AESA/GaN architecture, rotation and stop/stare coverage, range envelope, elevation limits, simultaneous mission modes, Mode 5 capability, remote/unmanned operation, transportability, and additional product background. | Accessed: 2026-07-04Lockheed Martin's First TPY-4 Radar Completes ProductionPublisher: Lockheed Martin | Note: Supports the first production completion milestone, official nomenclature, software-defined architecture, and transportability details. | Accessed: 2026-07-04TPY-4 Radar Earns Official U.S. Government Designation, Setting New Standard in Airspace Threat DetectionPublisher: Lockheed Martin | Note: Supports the September 2021 AN/TPY-4(V)1 designation, TPY-4's fully digital software-defined architecture, multi-mission air-defense role, GaN technology background, and commonality with Sentinel A4. | Accessed: 2026-07-043DELRR to Move Forward with Lockheed Martin's Long-Range Radar SystemPublisher: Hanscom Air Force Base | Note: Supports the U.S. Air Force selection of AN/TPY-4(V)1 for 3DELRR and the replacement path for the TPS-75 radar. | Accessed: 2026-07-04DOT&E FY2022 Annual Report - Air Force - 3DELRRPublisher: Director, Operational Test & Evaluation | Note: Supports 3DELRR TPY-4 system description, Control and Reporting Center role, single-face rotating AESA architecture, distributed digital beam forming, GaN transmitters, and long-range detection mission. | Accessed: 2026-07-04TPY-4 - Lockheed Martin | RADAR SystemPublisher: everything RF | Note: Supports specialist specification cross-checks for frequency, L-band classification, range, rotation rate, elevation coverage, AESA/GaN transmitter type, and mission applications. | Accessed: 2026-07-04TPY-X - Missile Defense Advocacy AlliancePublisher: Missile Defense Advocacy Alliance | Note: Supports TPY-X lineage context as an earlier L-band long-range air-surveillance radar concept with fixed and highly mobile variants. | Accessed: 2026-07-04AN/TPY-4 - DeagelPublisher: Deagel | Note: Supports specialist reference context for AN/TPY-4(V)1, TPY-X naming lineage, AESA/GaN L-band architecture, range modes, and elevation/altitude figures. | Accessed: 2026-07-04TPY-4 Radar Completes Successful Risk Reduction TestsPublisher: Lockheed Martin | Note: Supports the 2024 risk-reduction testing milestone and program progress toward fielded capability. | Accessed: 2026-07-04Royal Norwegian Air Force Selects the Lockheed Martin TPY-4 Radar to Enhance Homeland DefensePublisher: Lockheed Martin | Note: Supports Norway's 2022 TPY-4 selection, operator context, and Norwegian fielding and operations details. | Accessed: 2026-07-04Lockheed Martin Tapped for Additional Norwegian TPY-4 Radars, Completes Critical Design Review on SchedulePublisher: Lockheed Martin | Note: Supports Norway's additional 2024 TPY-4 order, the CDR milestone, and Royal Norwegian Air Force operating context. | Accessed: 2026-07-04Lockheed Martin Delivers First U.S. Air Force TPY-4 RadarPublisher: Lockheed Martin | Note: Supports the first U.S. Air Force delivery and early-phase testing milestone for TPY-4. | Accessed: 2026-07-04Sweden Selects the Lockheed Martin TPY-4 Radar to Enhance Regional Deterrence and Defense CapabilitiesPublisher: Lockheed Martin | Note: Supports Sweden's 2025 TPY-4 selection and planned 2027 deliveries. | Accessed: 2026-07-04Contracts For Mar. 26, 2021Publisher: U.S. Department of War | Note: Supports the 3DELRR rapid-prototyping integration contract, contract number FA8730-21-C-0022, and options for production and fielding of 35 radars. | Accessed: 2026-07-04New air surveillance radars to the Norwegian Armed ForcesPublisher: Government of Norway | Note: Supports Norway's 2022 contract for eight air-surveillance radars, option for three additional radars, Norwegian Air Force operator role, and planned delivery completion by 2030. | Accessed: 2026-07-04NATO far skjerpet blikk i nordPublisher: Norwegian Armed Forces | Note: Supports Norway's 11-radar TPY-4 chain, Kongsberg Defence & Aerospace integration role, first operational replacement site planned for 2026, and all radars planned by 2030. | Accessed: 2026-07-04Contracts For Jan. 18, 2024Publisher: U.S. Department of War | Note: Supports the January 2024 option exercise for three 3DELRR systems and associated production work under the Lockheed Martin contract. | Accessed: 2026-07-04FMV tecknar avtal om langrackviddig radarPublisher: Swedish Defence Materiel Administration | Note: Supports Sweden's June 2025 TPY-4 agreement with Lockheed Martin, PS-861 replacement context, contract value of about one billion Swedish kronor, options for additional systems, and first delivery to FMV planned for 2027. | Accessed: 2026-07-04Nya radarsystem ger kraftigt forbattrad formagaPublisher: Swedish Defence Materiel Administration | Note: Supports TPY-4's role in Sweden's broader new sensor-system procurement and the first TPY-4 delivery planned for 2027. | Accessed: 2026-07-04Lockheed Martin skal levere luftvarslingsradarer i Danmark og pa FaroernePublisher: Danish Ministry of Defence | Note: Supports Denmark's December 2025 selection of Lockheed Martin air-warning radars for Skagen, Bornholm, and the Faroe Islands, plus the option for a fourth radar in Greenland. | Accessed: 2026-07-04Denmark Selects Lockheed Martin TPY-4 Radar to Strengthen NATO Deterrence and Regional DefensePublisher: Lockheed Martin | Note: Supports that Denmark's selected Lockheed Martin air-warning radar is TPY-4, with three radars and an option for a fourth for Royal Danish Air Force and NATO air-defense use. | Accessed: 2026-07-04Contracts for Jan. 16, 2026Publisher: U.S. Department of War | Note: Supports the January 2026 $68.5 million option exercise to produce three additional 3DELRR radar systems. | Accessed: 2026-07-04Contracts for June 24, 2026Publisher: U.S. Department of War | Note: Supports the June 2026 3DELRR contract modification for interim contractor support and additional spares through May 2028. | Accessed: 2026-07-04