Description of the radar set, tactical-technical characteristics
Figure 1: S 1831 using 4.7 m wide aerial
|S 1831||S 1832|
|frequency:||2.8 … 3.1 GHz (S-Band)|
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):|
|pulsewidth (τ):||18 µs|
|instrumented range:||200 km|
|hits per scan:|
|antenna rotation:||10 or 20 min⁻¹||20 or 60 min⁻¹|
S 1830 is operating in S-Band medium-range target acquisition and surveillance radar family. This is an enhanced development of the S 1810.
The S 1830 can either use a 4.7 m high-gain antenna scanning at 10 or 20 rpm (S 1831), or a 2.4 m antenna scanning at 20 or 60 rpm (S 1832). The primary radiator of the antenna is a small phased-array antenna. The solid-state transmitter uses 38 power amplifier modules in parallel. These radars feature a fully digital MTI and pulse compression: the 18 microsecond output pulse is compressed to 0.4 microseconds on reception.
The S 1830 was designed to meet a requirement for a new air search radar to equip the four Norwegian Oslo class frigates (one Oslo class ship having been lost at sea in early 1994) and the six Type 21 frigates sold to Pakistan.
An additional version of this radar, using a planar antenna array, is designated S 1834. The antenna consists of 44 stacked boards rotates at 10 or 20 rpm. Maximum range is 187 km using a five-beam transmit pattern or 120 km using 12 beams (see Time Budget of a Pulsed Radar).