Lower Tier Air Missile Defense (LTAMD) Sensor

The Lower Tier Air Missile Defense (LTAMD) Sensor program is a key component of the Army's air and missile defense modernization efforts, as reflected in Program Element (PE) 0604114A. The primary goal of this program is to develop, integrate, and test the next-generation radar system, known as the Lower Tier Air and Missile Defense Sensor (LTAMDS). This radar is designed to sense and track tactical ballistic missiles and air-breathing threats, providing expanded battlespace coverage and 360-degree sensing capability. The LTAMDS will replace the legacy Patriot Radar Set (AN/MPQ-65A) within an Integrated Air and Missile Defense Battle Command System (IBCS)-enabled Patriot Battalion, addressing obsolescence and enhancing operational effectiveness.

The LTAMDS Capability line item funds the continuous integration and delivery of both software and hardware improvements to the radar system. Objectives include developing advanced tactical software, conducting modeling and simulation, and integrating upgrades that improve the radar's ability to counter evolving and complex threats. These efforts are intended to maximize the performance of the PAC-3 Missile Segment Enhancement (MSE) interceptor, enabling engagements at greater ranges and against more sophisticated adversaries. The program also supports Combat Identification/Discrimination (CID) updates to enhance radar classification and discrimination, which are critical for effective command and control and improved situational awareness.

A significant portion of the FY 2026 budget is allocated to the initiation of Initial Operational Test & Evaluation (IOT&E) for the LTAMDS. This testing phase will validate system integration, assess operational suitability, and ensure the radar meets technical maturity requirements. The IOT&E will include a series of missile flight tests against a variety of threat types, as well as training and operational assessments within realistic scenarios. These activities are essential for achieving key program milestones and informing the decision to proceed to full-rate production, which is projected for FY 2028.

The Support Equipment Development aspect of the program ensures that ancillary systems such as the Large Tactical Power System (LTPS), M870A4 trailer, and M983A4 Heavy Expanded Mobility Tactical Truck (HEMTT) Light Equipment Transporters (LET) remain compatible with the evolving LTAMDS capabilities. Funding in FY 2026 will support the development, integration, and modification of this support equipment. These efforts are necessary for deployment and sustainment of the radar system in operational environments.

The Advanced Threat Defeat initiative within the LTAMDS program is focused on maintaining radar overmatch against increasingly capable adversaries. This includes the development and integration of new signal processing techniques and waveforms to enhance both Electronic Attack and Electronic Protect capabilities. The program leverages both discretionary and mandatory funding, with the latter specifically supporting research and testing of these advanced electronic warfare techniques to ensure radar survivability in contested environments.

The Test and Evaluation budget line supports not only the IOT&E but also continuous transformation and experimentation at the theater and joint command levels. This includes ongoing developmental and operational testing, digital modeling and simulation, and participation in integrated fires test campaigns. These efforts are designed to provide data for program assessments, close identified performance gaps, and ensure the LTAMDS remains responsive to emerging threats and operational requirements.