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Description of the radar set, tactical-technical characteristics

Figure 1: AN/APS-94

Figure 1: AN/APS-94 carried by the OV-1 Mohawk

frequency: 9 100 … 9 400 MHz
pulse repetition time (PRT):
pulse repetition frequency (PRF): 694 … 809 Hz
pulsewidth (τ): 0.2 µs
receiving time:
dead time:
peak power: 160 kW
average power:
instrumented range: 50 NM (≙ 92 km)
range resolution: 30 m
beamwidth: 0.45°
hits per scan:
antenna rotation:


The AN/APS-94 radar surveillance set is an operating in X-band Side-Looking Airborne Radar (SLAR). The surveillance set ist mounted under and to the right of the MOHAWK OV-1D fuselage. The radar imagery filmstrips produced during the flight are removed when the aircraft lands. The filmstrips are processed through the tactical imagery interpretation facility (TIIF) wich is ground-based.

The SLAR system simultaneously produces both fixed (permanent echo, PE) and moving target indications (MTI) presentations on film in the cockpit of the aircraft. The PE mode of operation produces a radar map of the terrain and displays fixed target information and the MTI mode records moving target information. As antenna are used back-to-back slotted waveguides, sideways looking in a 18 ft. (5.5 meter) long, boxy, yaw-stabilized fiberglass pod.

During the Vietnam War the AN/APS-94F was one of the primary means for night detection of vehicular traffic. It detected fixed and moving targets on land and along coastal and inland waterways. With this surveillance system, the locations of moving targets were determined, as well as the long-term pattern of land and waterborne traffic in critical areas.