AN/TPS-77 MRR

History

The AN/TPS-77 MRR is the smallest and most mobile variant in Lockheed Martin's TPS-77 radar family, which itself derives from the AN/FPS-117 long-range air surveillance radar. In October 2015, Latvia purchased three TPS-77 MRR units from Lockheed Martin. Production was completed in June 2017 and factory acceptance testing was finished in October 2017. The first radar was delivered to Latvia in March 2018, with a successful site acceptance test marking on-time delivery.

In 2023, the United States ordered three AN/TPS-77 MRR radars for Lithuania through the Foreign Military Sales program under a $52 million contract covering delivery, personnel training, spare parts, and manufacturer technical support. In October 2026, Lithuania's Ministry of National Defence confirmed that the radars had been delivered and the country's army had begun deployment. Defence Minister Robertas Kaudenas stated that additional contracts would be signed by the end of the year to further strengthen detection and neutralization of air threats. The radars are being integrated into NATO's integrated air and missile defense system.

Design

The TPS-77 MRR is designed for ultra-low power consumption and employs Gallium Nitride (GaN) technology in its high-power amplifiers, which reduces power use, increases reliability, and extends the radar's service life. Its multi-role single scan technology allows operators to select multiple missions simultaneously, such as long-range or medium-range low-level flight surveillance in specific sectors; as the antenna rotates through each 360-degree scan the system automatically adjusts to the selected mission configuration.

The radar is highly transportable and can be moved by C-130 cargo aircraft, helicopters, trucks, or trains. It can be truck-mounted for rapid deployment at unprepared sites or dismounted for use at fixed installations.

Specifications

The AN/TPS-77 MRR is a three-dimensional air surveillance radar. Its long-range surveillance mission range is 463 km and its low-level flight surveillance mission range is 150 km. Lithuania's Ministry of National Defence states that the radar is designed to detect and track aerial targets at ranges of up to 470 km and altitudes up to 30 km.