[Frontier Update] $3 Billion Mass Production Launched: The U.S. Military's Sentinel A4 Radar Serves as the Core Sensing Backbone for Counter-UAS Operations

[Reportedly from Defence Blog website on July 1]

  In July 2026, the U.S. Army formally signed a long-term contract worth 3 billion US dollars, entrusting Lockheed Martin to carry out continuous mass production of the AN/MPQ-64F1 Sentinel A4 land-based air defense radar. Valid until 2031, the contract marks the system as the core pillar of the U.S. military's airspace awareness over the next five years. As the ultimate evolved variant of the Sentinel family, the A4 fully replaces conventional mechanical scanning frameworks with Active Electronically Scanned Array (AESA) antennas, enabling microsecond-level beam agility and parallel multi-target tracking. For the first time among tactical radars, it achieves high-probability detection and precise classification of low, slow, small unmanned aerial vehicles, loitering munitions and swarm targets, effectively filling the performance gaps of the original generation system when countering low-cost FPV attack drones priced at several hundred US dollars.
  Operating in the X-band (8–12 GHz), the system takes only 15 minutes to deploy on a single towed vehicle. It boasts a detection range of 75 kilometers against fighter jets and delivers stable tracking of small UAV targets. Its data can be seamlessly integrated into Patriot missile batteries, Avenger close-in weapon systems and the U.S. Marine Corps MADIS architecture, furnishing critical target designation for kinetic interception and electronic countermeasures.
  Unlike previous passive defense solutions reliant on single sensors, the Sentinel A4 leverages dynamic waveform adaptation and low-RCS target recognition algorithms to build a closed-loop response chain of "detect-to-lock, lock-to-guide". This capability empowers the U.S. military to conduct active threat sensing, real-time data distribution and coordinated interception against UAV hazards in complex electromagnetic environments for the first time.