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Description of the radar set, tactical-technical characteristics

Figure 1: SWR-503

Figure 1: SWR-503

frequency: 3 … 5 MHz
pulse repetition time (PRT):
pulse repetition frequency (PRF): 250 Hz
pulsewidth (τ):
receiving time:
dead time:
peak power: 16 kW
average power: 1.6 kW
instrumented range: 200 NM (≙ 370 km)
range resolution:
hits per scan:
antenna rotation:


SWR-503, or HFSWR is an Over–The–Horizon Surface Wave (OTH SW) radar operating in HF-band.

HFSWR provides simultaneous, all weather, coverage of ocean going vessels and aircraft throughout the 200 nautical mile Exclusive Economic Zone (EEZ). The radar consists of co-located transmit and receive sites and uses a floodlight beam on transmit to illuminate the surveillance area. The transmit antenna is a 7-element logarithmic-periodic monopole with a gain of 8 dB and a half-power beamwidth of 120 degrees. The radiated signal consists of a phase-coded pulse sequence. The receive antenna is a linear array of 16 monopole doublets. The spacing between the radiating elements is 33 m. Directional information of the reflected target signal is obtained using a phased array antenna in association with digital beam synthesis.

Two SWR-503 HFSWR systems, manufactured by Raytheon Canada Ltd, have been operating on Canada’s East Coast since 1999. On the Romanian Black Sea coast (Cap Midia, north of Constanța), such a radar was also set up in 2009.


Picture gallery of SWR-503 HFSWR

Figure 2: Setup of the transmitting antenna at Cap Midia
(44°23'02.2" N   28°43'10.5" O)

Figure 3: Receiving antenna array
(44°22'53.7" N   28°42'55" O)