Sentinel A4

Sentinel A4

The Sentinel A4 Mission

Sentinel A4 is a high-performance replacement of the legacy Sentinel A3 (AN/MPQ-64A3) air and missile defense radar that will provide significant improvements to the existing Sentinel capability against cruise missiles, unmanned aerial systems, rotary wing and fixed wing threats.  The Sentinel A4 will add the ability to detect Rocket, Artillery, and Mortar (RAM) threats, providing RAM Point of Origin and Point of Impact locations, while also providing added protection against electronic threats.

First Sentinel A4 Radar Completed in August, An Unprecedented Five Months Ahead of Schedule


The new Sentinel A4 radar will provide improved surveillance, detection, and classification capabilities against current and emerging aerial threats in order to protect battlefield maneuver formations and high value static assets to include: command and control nodes, tactical assembly areas and geo-political centers. This needed capability will help protect our warfighters for the next 40 years.

The US Army awarded the Sentinel A4 contract in September of 2019.  Since then, the program has achieved several milestones ahead of schedule, including System Requirements Review/ System Functional Review (SRR/SFR), Preliminary Design Review (PDR), and the Critical Design Reviews (CDR). In September of 2020, the Sentinel A4 radar array prototype became operational, five months ahead of schedule.

In October 2021, The U.S. Army Sentinel A4 Program Office provided an accelerated contract award to Lockheed Martin to begin production for five additional radar systems developed specifically to detect and identify cruise missiles, unmanned aerial systems, rotary wing and fixed wing aircraft, and rocket, artillery, and mortar threats. Army soldiers will use these radars to evaluate the operations of the new Sentinel A4s, which are projected to be delivered by the end of 2022.

Even though the initial Sentinel A4 contract for 18 radars was awarded only two years ago, the Sentinel A4 team already completed production of the first A4 system this summer. Lockheed Martin executed a full radar development program, including the traditional design process events, most of which was completed during strict COVID-19 conditions, in that short timeframe. The first five systems of the original contract are expected to be delivered to the U.S. Army in March 2022.

Lockheed Martin’s open architecture is the cornerstone of the radar system’s design and will allow for future performance upgrades that require minimal hardware modifications.

How Sentinel A4 Is Staying Ahead of Schedule

The Sentinel A4 program has an agile development process and has stayed ahead of schedule for several reasons.

  • Focus on Digital Transformation: Lockheed Martin has developed digital models that are shared across the supply base lending to flexibility, optimized test opportunities and cost savings.
  • Open Scalable Radar Architecture: Lockheed Martin’s open architecture is the cornerstone of the radar system’s design and will allow for future upgrades that not only extend the life of the radar, but also address evolving threats over the next 40 years. To quickly mature the design of this radar system, Lockheed Martin focused on the core building blocks, those repeating architecture elements that provide the real radar capability, and then scaled from there to bring up the mechanical structures around it.
  • Investment in the Future: Lockheed Martin has invested significantly in the advancement of its software-defined radar technology, including its automated manufacturing processes, which improves quality and leads to cost reduction.
  • Relationships:  The U.S. Army and Lockheed Martin have built a tremendous partnership for the Sentinel A4 program. The collaboration between the Army and Lockheed Martin teams and their singular focus on mission success milestones, has resulted in an accelerated timeline.

The Mission: Improved Detection of Advanced Threats

The $281 million contract to develop the Sentinel A4 system was awarded to Lockheed Martin in September 2019. The new air and missile defense radar will provide improved capability in contested environments against cruise missiles, unmanned aerial systems, rotary wing and fixed wing aircraft, and rocket, artillery, and mortar threats.  This includes enhanced surveillance, detection, and classification capabilities to protect U.S. Army maneuver formations.

Proven Radar Experience

With broad and deep experience developing and delivering ground-based radar solutions to customers, Lockheed Martin’s high-performing, high-reliability, solid state radar (SSR) systems specialize in counter target acquisition, early warning, situational awareness, and integrated air and missile defense. Lockheed Martin radars are designed with a high degree of commonality, are available in highly mobile configurations, operate in all environments and are deployed worldwide. It’s why Lockheed Martin’s ground-based radars are the choice of more than 45 nations on six continents.

The U.S. Government has approved marketing and export of the Sentinel A4 for our International partners. Lockheed Martin looks forward to providing briefings to international partner nations regarding the capabilities of the Sentinel A4 radar for their Ground-Based Air Defense needs.

Satisfies a Real, Threat-Based Mission Need

A modern sensor that has been designed to address current and emerging Air, RAM and Cruise Missile threats

A Sensor to Evolve with the Operational Environment

The next generation Sentinel A4 radar leverages recent advances in radar technology to provide a modular, scalable architecture

Mature, Low-Risk
Technology

State of the Art Digital Architecture with Gallium Nitride (GaN) transmitter technology, distributed architecture concepts, and advanced signal processing techniques


Lockheed Martin’s open scalable radar architecture is the cornerstone of the radar system’s design and will allow for future upgrades that not only extend the life of the radar, but address threats to our warfighters that will evolve over the next several decades.
 

Additional Information

Media and Press Inquiries

Kelly Vann
+1 (315) 391-1966

The World's Most Advanced Radar and Sensors Family

The World's Most Advanced Radar and Lockheed Martin’s radar and electro-optical/infrared sensor systems provide advanced precision targeting, navigation, threat detection and next generation intelligence, surveillance and reconnaissance capabilities. We’ve designed and delivered radars and sensors for every armed service and operational environment. Our space-based solutions collect and transmit imagery and sensor data that informs critical decisions made by national leaders, troops on the battlefield, intelligence agents and emergency responders, as well as the public and private sector.Sensors Family

See how the future is taking shape