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Description of the radar set, tactical-technical characteristics

Figure 1: STIR

Figure 1: STIR

frequency: X-band K-band
pulse repetition time (PRT):
pulse repetition frequency (PRF): 1 800 or 3 600 Hz
pulsewidth (τ):
receiving time:
dead time:
peak power: 220 kW20 kW
average power:
instrumented range: 120 … 512 km36 km
range resolution:
beamwidth: 1.4°0.3°
hits per scan:
antenna rotation:


STIR (Signaal Tracking and Illuminating Radar) is a medium-to-long-range weapon control radar family made by THALES company.[1] With different dish sizes, different transmitter powers and using different combinations of RF-bands, a dedicated, self-contained STIR subsystem can be provided for each type of naval combat system.

In the basic version this radar is fitted with I- and K-band transceivers. The I-band antenna is a Cassegrain antenna. This system provides a Continuous Wave Illumination by simultaneous control for both semi-active homing missiles (e.g. Seasparrow, Aspide, ESSM, SM1, SM2) as well as guns. The Cassegrain subreflectors backside is the parabolic reflector for the K-band system. The diameter of the main parabolic reflector may be either 2.4 m, 1.8 m, or 1.2 m. STIR-IK Mk.2 is a version that is combined with infra-red sensible optical tracking cameras.

The initial versions are fitted with a TWT- transmitter. There are update-kits with a solid-state transmitter, new tracking algorithms and display aids available for ship-life-extension-programs.

In the Canadian Royal Navy variants of the STIR with the 1.2 m antenna got the new designator AN/SPG-501 (single band version) and AN/SPG-503 (dual band radar).


STING is a miniaturized dual band version for smaller ships. It includes the 1.2 m dual-band antenna, solid-state transmitters, new tracking algorithms and displays. The name is a contraction of STIR and NG, that stands for “Next Generation”.

Notes and Sources:

  1. Please do not confuse it with Lockheed Martins AN/SPG-60, also-called STIR as contraction of “Separate target illumination radar”.
  2. Manufacturers Leaflet for STIR 1.2 EO Mk2
  3. Manufacturers Leaflet for STIR 2.4 HP
  4. Manufacturers Data Sheet for STIR 2.4 HP
  5. Manufacturers Leaflet for STING EO Mk II
  6. Manufacturers home page
Picture gallery of STIR and STING

Figure 2: STING antenna

Figure 3: Ezzat class (Ambassador Mk III) fast attack craft of the Egyptian Navy, using STING