Description of the radar set, tactical-technical characteristics
Figure 1: Calypso
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):|
|pulsewidth (τ):||1 µs or 50 ns|
|peak power:||25 kW|
|instrumented range:||20 NM (≙ 37 km)|
|hits per scan:|
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:
- continuous scanning,
- sector operation,
- 0.1- or 1-second burst, or
- passive (receive only).
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.