Lockheed Martin has delivered the first Sentinel A4 radar from the US Army’s LRIP 2 batch, marking the start of a 19-unit production run. Approved in August 2023, the LRIP program will introduce the Sentinel A4 as a replacement for the Sentinel A3 and integrate it into the Army’s Integrated Air and Missile Defense Battle Command System and Indirect Fire Protection Capability.
The handover comes after the radar completed the initial phase of Initial Operational Test and Evaluation, during which it was successfully linked with the Forward Area Air Defense Command and Control network. This achievement moves the Sentinel A4 closer to a full-rate production decision.
While detailed specifications remain classified, the radar is designed to deliver precise target tracking data to IBCS and FAAD-C2, allowing commanders to make rapid engagement decisions. The system features an open-architecture framework and a 360-degree GaN-based AESA sensor capable of detecting and tracking a wide array of threats, including missiles, drones, aircraft, helicopters, rockets, artillery, and mortars.
The Sentinel A4 can be deployed at fixed locations or operate alongside maneuvering forces and is engineered to perform in harsh terrain and electronically contested environments. It also supports interoperability with external systems such as NASAMS, Aegis, and NORAD.
