AN/MPQ-14

The AN/MPQ-14 was a height and direction-finding radar which was used for Ground Directed Bombing (GDB), during the Korean and Vietnam War. The AN/MPQ-14 was employed to guide attack aircraft at night or during adverse weather conditions. It was the first guiding radar system used to direct bombing missions conducted by the US Marine Corps, introducing the ability to deliver ordnance in close air support missions in poor visibility conditions. The AN/MPQ-14 operated in the frequency range of 2,740 to 2,960 MHz and had an azimuth of 360º.

AN/SPN-46

The AN/SPN-46 is a precision aproach and landing radar system developed by Textron Systems for the US Navy aircraft carriers. The AN/SPN-46 utilizes an X-band coherent transmitter and receiver using monopulse tracking and doppler processing on received signals for clutter rejection and rain attenuation at an operating range of 8 nmi. During day and night operations and in adverse weather conditions, the AN/SPN-46 provides safe and reliable final approach and landing guidance for Marine Corps helicopters and AV-8B Harrier VSTOL attack aircraft. Since this radar system is equipped with two dual-band radar antennas/transmitters, the AN/SPN-46 can control up to two aircraft simultaneously in a "leapfrog" pattern. The AN/SPN-46 is also capable of providing for a manually controlled approach (MODE III landing) in which the AN/SPN-46 air traffic controller relays to the pilot continuous updates on his position and direction. The AN/SPN-46 also uses low-probability-of-intercept (LPI) technology to decrease the probability of passive detection by hostile forces.