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Description of the radar set, tactical-technical characteristics

Figure 1: Antenna group of TRS-4D

Figure 1: Antenna group of TRS-4D
© 2011 Airbus Defense and Space, Inc.

frequency: G-band
pulse repetition time (PRT):
pulse repetition frequency (PRF):
pulsewidth (τ):
receiving time:
dead time:
peak power:
average power:
instrumented range: 250 km
range resolution:
accuracy: 15 m; β: 0,2°; ε: 0,5°
hits per scan:
antenna rotation: 15 or 30 min⁻¹


TRS-4D is a C-band (IEEE designation) or in the G-band (NATO designation) three-dimensional, multi-function naval radar for surveillance, target acquisition, self-defense, gunfire support, and aircraft control. It is a software-defined radar using a rotating version of the active electronically scanned array (AESA) with multiple digitally formed beams. It automatically detects and tracks all types of air and sea targets, alleviating crew workload requirements. TRS-4D supports the countering of conventional and asymmetric threats.

The TRS-4D radar simultaneously conducts a three dimensional search of the air space volume and sea surface area around the ship. It automatically detecting contacts in the air and surface to create tracks that are sent to the ship’s combat management system or radar console. The transmitter modules in the active antenna are solid-state modules in Gallium Nitride technology. The radar allows a graceful degradation of the transmitted power depending on the required maximum range.

From about mid-2019 this radar was given the additional name “Rotator” because another member of the TRS/TRML-4D radar family was marketed as TRS-4D “Fixed Panel”.

The MRESR version of the TRS-4D was installed on US LCS ships of the U.S. Navy’s Freedom class. It was designated by US Navy as AN/SPS-80.

A land-based version is used as the main sensor in the IRIS-T SLM Ground Based Air Defense (GBAD) system.