www.radartutorial.eu www.radartutorial.eu Card Index of Radar Sets - Naval Radars


Description of the radar set, tactical-technical characteristics
Variant antenna
(click to enlarge: 500·465px = 45 kByte

Figure 1: Antenna of the Variant radar

frequency: I- and G-band
pulse repetition time (PRT):
pulse repetition frequency (PRF): 3 - 9 kilohertzes
pulsewidth (τ): 4.5, 12.8 and 16 microseconds
receiving time:
dead time:
peak power: 200 watts
average power:
instrumented range: 40 or 50 NM
range resolution:
beamwidth: 1,2° … 1,8 degrees
hits per scan:
antenna rotation: 14 and 28 rpm.


Variant is a 2D surveillance and target indication radar. Its principal role is as an automatic, fast reaction time radar sensor supplying targeting data to weapon systems. Targeting data is supplied for both air and surface targets simultaneously. Variant is a dual-band radar, utilising both the I- and G-Bands. Fully coherent, Variant provides pulse doppler operation for optimal clutter suppression and air target detection. Automatic “Hands off” target detection and tracking is provided by modular digital processing.

Outstanding ECM facilities are provided by the ability to operate over two frequency bands, an octave apart, and an integral Low Probability of Intercept (LPI) radar sensor. This LPI sensor can be used alone, thus providing Variant the unusual ability to operate in a mode that is almost indetectable to external ESM. Variant’s low power consumption, lightweight construction and compact design, make the system well suited for use in fast patrol boats and other small ships.

Variant is based on a double pill-box antenna, having a horizontal beamwidth of 1.8° and a vertical beamwidth of 14°. The transmitter is a Traveling Wave Tube with an average power of 200 W. Processing is based on digital pulse compression, Fast Fourier Transform processing, plot processing and automatic tracking. Detection range against a typical air target is given as about 30 km in G-band and 28 km in I-band.