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.

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.

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.

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

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.