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Calypso

Description of the radar set, tactical-technical characteristics

Figure 1: Calypso

Figure 1: Calypso

Specifications
frequency: X-band
pulse repetition time (PRT):
pulse repetition frequency (PRF):
pulsewidth (τ): 1 µs or 50 ns
receiving time:
dead time:
peak power: 25 kW
average power:
instrumented range: 20 NM (≙ 37 km)
range resolution:
accuracy:
beamwidth:
hits per scan:
antenna rotation:
MTBCF:
MTTR:

Calypso

Calypso is an operating in the X-band radar family designed to provide surveillance and navigation facilities for submarines. The antenna can withstand very high water pressure.

The basic version Calypso was commissioned into the French Navy with the manufacturer’s designation DRUA 33 from 1964. The further development to Calypso Ⅱ was designated DRUA 33A and Calypso Ⅲ DRUA 33B. The Calypso Ⅱ and Ⅲ (later referred to as the TRS 3100) use a magnetron as the transmitter while the Calypso Ⅳ (also referred to as TRS 3110) uses a klystron and can use a much shorter transmitter pulse. Both transmitter types are frequency tunable and can be operated in several modes:

The receiver is equipped with logarithmic circuitry against interference from sea clutter.

Calypso was used on submarines of various countries, for example, France, Argentina, Egypt, and Turkey.