# OPS-20

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{{Short description|Anti-water search radar by Japan Radio}}
{{Infobox radar|name=OPS-20|image=File:OPS-20 on board DD-109.jpg|caption=OPS-20 aboard [JS Ariake](/source/JS_Ariake)|country=[Japan](/source/Japan)|introdate=1969|frequency=[X band](/source/X_band)|manufacturer=[Japan Radio](/source/Japan_Radio)|type=2D|azimuth=Unlimited}}
'''OPS-20''' is a two-dimensional radar manufactured by [Japan Radio](/source/Japan_Radio_Company). It is compatible with the [Global Maritime Distress and Safety System](/source/Global_Maritime_Distress_and_Safety_System) (GMDSS) and installed as an anti-water search radar on the [Maritime Self-Defense Force](/source/Japan_Maritime_Self-Defense_Force)'s escort ship.<ref name=":0">{{Cite book|title=Self-Defense Force Equipment Yearbook 2006-2007|date=15 July 2006|publisher=Chaoyun News Agency|isbn=4-7509-1027-9|pages=367}}</ref> Variations include '''OPS-20B''', '''OPS-20C''' and '''OPS-20E'''.

The model numbers of the Maritime Self-Defense Force's electronic devices, including this machine, are generally based on the naming rules for military electronic devices of the U.S. military. It is for radar mounted on surface vessels, for detection / distance direction measurement / search.<ref name=":0" />

== Overview ==
In addition, the OPS-20C is adopted by the [Hyūga-class helicopter destroyer](/source/Hy%C5%ABga-class_helicopter_destroyer) and [Akizuki-class destroyer](/source/Akizuki-class_destroyer_(2010)) has been developed as an anti-water search radar, and is composed of two [antennas](/source/Antenna_(radio)), a main and a sub. Also, by changing the radar wave used from pulse wave to unmodulated [continuous wave](/source/Continuous-wave_radar) (CW), the [discoverability](/source/discoverability) is reduced.<ref name=":1">{{Cite book|last=Nagai|first=Arahito|title=Current Ship-based Radar of the Maritime Self-Defense Force, Ships of the World|publisher=Gaijinsha|date=March 1991|volume=433|location=Japan|pages=84–89}}</ref> 

=== On board ships ===

* [Abukuma-class destroyer escort](/source/Abukuma-class_destroyer_escort) ([JS Tone](/source/JS_Tone)) 
*[Kongo-class destroyer](/source/Kong%C5%8D-class_destroyer) 
*[Murasame-class destroyer](/source/Murasame-class_destroyer_(1994)) 
*[Takanami-class destroyer](/source/Takanami-class_destroyer) 
*[Atago-class destroyer](/source/Atago-class_destroyer) 
*[Hyūga-class helicopter destroyer](/source/Hy%C5%ABga-class_helicopter_destroyer) 
*[Akizuki-class destroyer](/source/Akizuki-class_destroyer_(2010)) 
*[Izumo-class helicopter destroyer](/source/Izumo-class_helicopter_destroyer) 
*[Ōsumi-class tank landing ship](/source/%C5%8Csumi-class_tank_landing_ship) 
*[Uraga-class mine countermeasure vessel](/source/Uraga-class_mine_countermeasure_vessel) 
*[Hayabusa-class patrol boat](/source/Hayabusa-class_patrol_boat)  
*[JS Kashima](/source/JS_Kashima) 
*[JS Chihaya](/source/JS_Chihaya) 
*[Towada-class replenishment ship](/source/Towada-class_replenishment_ship)  
*[Mashū-class replenishment ship](/source/Mash%C5%AB-class_replenishment_ship) 
*[JS Nichinan](/source/JS_Nichinan) 
*[JS Tenryū](/source/JS_Tenry%C5%AB) 

== Gallery ==
<gallery mode="nolines">
File:Mast of JS Atago(DDG-177) Radars.jpg|OPS-20 aboard [JS Ataga](/source/JS_Atago)
File:OPS-20B Radar on board JS Kirisame(DD-104) at Port of Osaka May 15, 2016.JPG|OPS-20B aboard [JS Kirisame](/source/JS_Kirisame)
File:OPS-20C radars on JS DD115 Akizuki at Nagoya (2013 August 4th).jpg|OPS-20C abaoard [JS Akizuki](/source/JS_Akizuki)
File:OPS-20C on JDS DD-116 Teruzuki at Harumi-pier,Tokyo (2013 Dec 1) 26.jpg|OPS-20C aboard [JS Teruzuki](/source/JS_Teruzuki) 
</gallery>

== Citations ==
<references />

== References ==

* [Norman Friedman](/source/Norman_Friedman) (2006). ''[https://books.google.com/books/about/The_Naval_Institute_Guide_to_World_Naval.html?hl=ja&id=4S3h8j_NEmkC The Naval Institute Guide to World Naval Weapon Systems]''.  [Naval Institute Press](/source/Naval_Institute_Press).  [ISBN](/source/ISBN) [9781557502629](/source/%3Aja%3A%E7%89%B9%E5%88%A5%3A%E6%96%87%E7%8C%AE%E8%B3%87%E6%96%99%2F9781557502629)
* ''Self-Defense Force Equipment Yearbook 2006-2007''. Asaun News Agency. ISBN 4-7509-1027-9

Category:Naval radars
Category:Military radars of Japan
Category:Military equipment introduced in the 1960s

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Adapted from the Wikipedia article [OPS-20](https://en.wikipedia.org/wiki/OPS-20) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/OPS-20?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.