STIR

The STIR (Signaal Tracking and Illuminating Radar) is a family of medium-to-long-range naval weapon control radars manufactured by Thales. Operating in the X-band with a 1.4° beamwidth, it features a peak power of 220 kW, a pulse repetition frequency (PRF) of 1,800 or 3,600 Hz, and an instrumented range from 120 to 512 km. The basic version includes I- and K-band transceivers, with the I-band utilizing a Cassegrain antenna and the K-band using the backside of the Cassegrain subreflector as a parabolic reflector. This system provides continuous wave illumination for semi-active homing missiles such as Seasparrow, Aspide, ESSM, SM1, and SM2, as well as for gun fire control. Main parabolic reflector diameters vary between 1.2 m, 1.8 m, and 2.4 m, with the STIR-IK Mk.2 variant integrating infrared optical tracking cameras. Initial versions used a Traveling Wave Tube (TWT) transmitter, with solid-state transmitter upgrade kits, new tracking algorithms, and display aids available for ship life extension programs. The Royal Canadian Navy designates variants with the 1.2 m antenna as AN/SPG-501 (single band) and AN/SPG-503 (dual band). The STING, a miniaturized dual-band version for smaller ships, incorporates a 1.2 m dual-band antenna, solid-state transmitters, and updated tracking algorithms and displays.

radartutorial.eu: https://www.radartutorial.eu/19.kartei/07.naval/karte068.en.html