Military radars of Japan

300px|thumb|FCS-3A on board JS Akizuki FCS-3 is an integrated naval weapons system developed by the Japanese Defense Ministry for the Japan Maritime Self-Defense Force.

The J/FPS-5, or also known as the Gamera Radar, is an airspace warning and control radar device operated by the Japan Air Self-Defense Force. It is a large fixed 3D radar for radar sites, and is a phased array radar that uses an active phased array antenna (AESA) and is also capable of detecting and tracking ballistic missiles. It was made by Mitsubishi Electric.

AN/SPS-39 is a three-dimensional radar was manufactured by Hughes Aircraft Company. It was used by the US Navy as a parabolic-cylinder reflector antenna after World War II, and was equipped aboard naval ships during the Cold War. It was mass-produced based on AN/SPS-26, and was also the first 3D radar deployed by the US Navy in the fleet. It later evolved into an improved AN/SPS-52.

The OPS-24 is a shipborne three-dimensional air search radar adopting active electronically scanned array (AESA) technology.

FCS-1 was a Japanese ship gun fire-control system (GFCS).

Type 81 Fire Control System (FCS-2) is a Japanese shipboard gun and missile fire-control system. This series of systems has been installed on destroyers of the Japan Maritime Self-Defense Force built between FY1977 and FY2001 to control medium-caliber guns and Sea Sparrow missiles, including ESSM.

OPS-12 is a shipborne long range air search 3D radar adopting passive electronically scanned array (PESA) technology. It was one of the first PESA radars employed on an operational warship, introduced in 1980 by the Japan Maritime Self-Defense Force. The OPS-12 is reported to have a range of more than 200km, and a target passive track capability of up to 100 contacts simultaneously.