Description of the radar set, tactical-technical characteristics
Figure 1: WM-20 Serie
Hollandse Signaalapparaten BV
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):|
|peak power:||180 kW … 1 MW|
|instrumented range:||32 NM (≙ 60 km)|
|hits per scan:|
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.
Picture gallery of WM-20 Serie
Figure 2: Mark 92 FCS
(© 2015 Jörg Waterstraat, www.kriegsschiffe.net