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Description of the radar set, tactical-technical characteristics

Figure 1: AN/APG-78

Figure 1: AN/APG-78

frequency: Ka-band
pulse repetition time (PRT):
pulse repetition frequency (PRF):
pulsewidth (τ):
receiving time:
dead time:
peak power:
average power:
instrumented range: 8 … 12 km
range resolution:
hits per scan:
antenna rotation:


AN/APG-78 “Longbow” is a short range, operating in Ka-band millimeter-wave multimode surveillance and fire-control radar and target acquisition system.

The AN/APG-78 and radar frequency interferometer are housed in a dome located above the main rotor. The radome’s raised position enables target detection while the helicopter is behind obstacles (e.g. terrain, trees or buildings). The AN/APG-78 is capable of simultaneously tracking up to 128 targets and engaging up to 16 at once, an attack can be initiated within 30 seconds. A radio modem integrated with the sensor suite allows data to be shared with ground units and other Apaches; allowing them to fire on targets detected by a single helicopter.

The radar is fielded with the Apache AH-64 Attack Helicopter system in the US Army.

Picture gallery of AN/APG-78

Figure 2: AN/APG-78 without radome

Figure 3: Apache AH-64D Helicopters