It is installed as an anti-water search radar on the Maritime Self-Defense Force's escort ship.

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.

[1] The National Safety Agency's Coastal Security Force obtained the 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, the first domestic guard ship for the National Safety Agency guards, and the Ikazuchi-class destroyer escort.