AN/APQ-174

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The AN/APQ-174 is an American K_u band radar used on military helicopters for navigation, particularly at low level.

It was developed during the late 1980s, as a derivative of the AN/APQ-168 and LANTIRN radars. It was initially procured in the early 1990s for a variety of platforms, including U.S. Army MH-47 Chinooks and MH-60s. The radar can be used for a variety of missions, including: combat search and rescue and special forces insertion and extraction.

This podded radar has a variety of modes, including terrain-following and terrain-avoidance, ground mapping, air-to-ground ranging, weather detection/tracking, navigation, beacon interrogation, cross scan modes and power management.

Angular scan times are 5.5º/sec and the weather mode is improved during heavy rain by the use of circular polarization.

In accordance with the Joint Electronics Type Designation System (JETDS), the "AN/APQ-174" designation represents the 174th design of an Army-Navy airborne electronic device for radar special equipment. The JETDS system also now is used to name all Department of Defense electronic systems.