View source for OPS-18

{{Infobox radar|name=OPS-18|image=File:JS Kashima（TV-3508） OPS-18 in Tenpouzan Port 140323.JPG|caption=OPS-18 aboard [[JS Kashima]]|country=[[Japan]]|type=2D|introdate=1976|power=150 ~ 200 kW|frequency=[[C band (NATO)|C band]]|azimuth=Unlimited|manufacturer=[[Japan Radio Company]]}}
'''OPS-18''' is a two-dimensional radar manufactured by [[Japan Radio Company]]. It is installed as an anti-water search radar on the [[Japan Maritime Self-Defense Force|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-18-1''' and '''OPS-18-3'''.
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" />
== OPS-3 / OPS-5 ==
The National Safety Agency's Coastal Security Force obtained the [[AN/SPS-5|AN/SPS-5B]] radar as equipment for the [[Bluebird-class minesweeper]] ([[Yashima-class minesweeper]]) provided by the [[United States]] in the 1958 plan.
In Japan, the OPS-3 was developed based on this AN/SPS-5, and started to be installed on the [[JDS Akebono (DE-201)|JDS Akebono]], the first domestic guard ship for the National Safety Agency guards, and the [[Ikazuchi-class destroyer escort]]. The subsequently developed OPS-5 was installed on the first [[Akizuki-class destroyer (1959)|Akizuki-class destroyer]].<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>
[[File:Oonami.jpg|thumb|OPS-5 aboard [[JDS Ōnami]]]]
=== On board ships ===
==== OPS-3 ====
*[[JDS Akebono (DE-201)|JDS Akebono]]
*[[Ikazuchi-class destroyer escort|Ikazuchi-class destroyer]]
*[[Murasame-class destroyer (1958)|Murasame-class destroyer]]
==== OPS-5 ====
*[[Ayanami-class destroyer]]
*[[Akizuki-class destroyer (1959)|Akizuki-class destroyer]]
== OPS-16 / OPS-17 ==
In the 1960s, the OPS-16 radar was developed as the second generation based on the OPS-3 and OPS-5. These used slightly higher frequencies and had enhanced ECCM properties.
It has undergone a minor upgrade which allowed it to switch between true and relative orientations, and has video output and trigger output terminals. In addition, the '''OPS-16D''' type has been made into a semiconductor element based on the '''OPS-16C''' type, and the pulse width and pulse repetition frequency have been changed to improve performance. In addition, the major version upgrade version of OPS-17 has two intermediate frequency bandwidths and two video bandwidths.<ref name=":1" />
[[File:JS Harima(AOS-5202) OPS- 16 and OPS-9 in Kure Naval Base 140915.JPG|thumb|OPS-16 aboard [[JS Harima]]]]
=== On board ships ===
==== OPS-16 ====
* [[Umitaka-class submarine chaser]]
* [[Mizutori-submarine chaser]]
* [[Isuzu-class destroyer escort]]
* [[Tachikaze-class destroyer]]
* [[JS Chiyoda (1983)|JS Chiyoda]]
* [[Hibiki-class ocean surveillance ship]]
* [[JDS Azuma]]
* [[Japanese icebreaker Fuji (AGB-5001)|Fuji]]
==== OPS-17 ====
* [[Yamagumo-class destroyer]]
* [[Takatsuki-class destroyer]]
* [[Minegumo-class destroyer]]
* [[Chikugo-class destroyer escort]]
* [[Haruna-class destroyer]]
* [[JDS Hayase]]
* [[JDS Sōya]]
== OPS-18 ==
The OPS-18 was developed from the 1970s to the 1980s by introducing the frequency agility method. The OPS-18 has two built-in transmitters, a wideband automatic tuning function and an automatic collision prevention assistance (ARPA) function, and can display up to 10 targets at the same time.
On the other hand, while removing the ARPA function in OPS-18-1, it has a target indication function with improved minimum sensitivity, and it plays a role as a low-altitude warning radar in the Hatsuyuki-class destroyer. In addition, in OPS-18-3, a parabolic cylinder type antenna is used instead of the parabolic torus type antenna conventionally used in this series.<ref name=":1" />[[File:Foremast of DD-127 (with captions).jpg|thumb|OPS-18-1 aboard [[JS Isoyuki]]]]
=== On board ships ===
* [[Hatsuyuki-class destroyer]]
* [[PG-821-class patrol boats]]
* [[Hayabusa-class patrol boat]]
* [[Miura-class tank landing ship]]
* [[Uraga-class mine countermeasure vessel]]
* [[Towada-class replenishment ship]]
* [[Futami-class hydrographic survey ship]]
* [[JS Kurobe]]
* [[JS Tenryū]]
* [[Hibiki-class ocean surveillance ship|Hibiki-class ocean surveillance Ship]]
* [[JS Kashima]]
* [[JS Asuka]]
== Gallery ==
<gallery mode="nolines">
File:JS Akiduki(DD-161).jpg|OPS-5 aboard [[JDS Akizuki]]
File:JMSDF DD-121 Yuugumo.jpg|OPS-17 aboard [[JDS Yūgumo]]
File:OPS-18 radar on board ASE-6102.jpg|OPS-18 aboard [[JS Asuka]]
File:OPS-18-3 radar on board mast of JS Hayabusa(PG-824) left front view at JMSDF Maizuru Naval Base July 27, 2014.jpg|OPS-18-3 aboard [[JS Hayabusa]]
</gallery>
== Citations ==
<references />
== References ==
* [[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]].  [[ISBN]] [[:ja:特別:文献資料/9781557502629|9781557502629]]
* ''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 1970s]]