AN/APQ-164

The AN/APQ-164 is an X-band low-observable, multimode airborne radar developed by Westinghouse in the United States. Primarily installed in the U.S. Air Force B-1B Lancer aircraft, it provides terrain-following, navigation, and weapon control capabilities, offering precise all-weather automatic terrain following and terrain avoidance at low altitudes with an instrumented range of 160 nautical miles (300 km). This system is a modified AN/APG-66 pulse-Doppler radar, featuring an elliptical passive element phased array antenna measuring 1,118 × 559 mm with 1,526 phase control modules capable of electronic scanning to ±60° in both axes, and a TWT-amplifier type transmitter similar to the AN/APG-68. The AN/APQ-164 in the B-1B is a dual-redundant system, with two complete and independent sets of Line Replaceable Units (LRUs), excluding the phased array antenna. First flown on a B-52 in 1977, with initial production deliveries in 1984, over 120 systems have been delivered; since 2015, it has been gradually replaced by the SABR-GS, a successor to the AN/APG-83.

radartutorial.eu: https://www.radartutorial.eu/19.kartei/08.airborne/karte077.en.html