WM-20 Serie
Description of the radar set, tactical-technical characteristics
Figure 1: WM-20 Serie
| Specifications | |
|---|---|
| frequency: | X-band |
| pulse repetition time (PRT): | |
| pulse repetition frequency (PRF): | |
| pulsewidth (τ): | |
| receiving time: | |
| dead time: | |
| peak power: | 180 kW … 1 MW |
| average power: | |
| instrumented range: | 32 NM (≙ 60 km) |
| range resolution: | |
| accuracy: | 0.8 mrad |
| beamwidth: | |
| hits per scan: | |
| antenna rotation: | |
| MTBCF: | |
| MTTR: | |
WM-20 Serie
The WM-20 Serie are operating in X-band track while scan fire-control radar systems developed in the late 1960s to early 1970s. In 1991, the CelsiusTech group introduced an extensive modernization package for the WM-20 radar family.
The radar employs a combined antenna system (CAS), which houses both search antenna including IFF in the standard Mark Ⅹ, and tracking radar antenna all inside a single radome. Both magnetron and traveling wave tube (TWT) versions were available. The typical peak power is 180 kW, but for the WM-25 this is increased to 200 kW with the aid of a 1 MW crossed field amplifier. Both search and tracking radar antennas can operate with a single transmitter. Whose output power is usually shared by waveguide switching for surveillance and air-target tracking. A double transmitter arrangement were available as well.
The WM-20 series of weapon control systems include the following variants:
- WM-20 – an integrated gun and torpedo weapon control system for use on small warships against air and surface targets.
- WM-22 – a simpler version of the WM-20 for use on larger vessels, with guns only.
- WM-24 – a similar system to the WM-22 but with increased capability.
- WM-25 – designed specifically for low-level air defense and uses an integrated system concept with anti-clutter and anti-jamming features.
- WM-26 – a highly simplified gun control and navigation system designed to provide continuous air and surface surveillance, radar navigation, combat information, target designation and weapon control.
- WM-27 – a weapon control system for small vessels using ASW missiles, torpedoes and guns.
- WM-28 – designed to control one SS missile and two light/medium caliber guns. An americanized version built under license by Sperry is the Mark 92 FCS.
- WM-29 – similar to the WM-28 but used with a command-guided surface-to-air missile.
The Mk. 92 Fire Control System is an Americanized version of the WM-25 radar family. Sperry Corp. is producing the Mk. 92 for use by the U.S. Navy, the U.S. Coast Guard, and foreign customers.
