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Description of the radar set, tactical-technical characteristics
HADR radar under a radome
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Figure 1: HADR radar under a radome

frequency: F-Band
pulse repetition time (PRT): 4 ms
pulse repetition frequency (PRF): 60 - 1430 Hz
pulsewidth (τ): 96 / 36 µs
receiving time: < 3 ms
dead time: approx. 50 µs
peak power: > 1.5 MW
average power: < 32 kW
instrumented range: 240 NM
range resolution: 450 ft
beamwidth: 1.1° - 1.7°
hits per scan: 1 - 8
antenna rotation: 5 rpm


The HADR radar (Hughes Air Defense Radar, designation by the manufacturer: HR-3000) was developed from the AN/SPS-52, of which two existing phased array antennas of the ship radar were used one above the other, and the serpentine feed was moved behind the antenna plane. The maximum range was achieved by adding another power amplifier (amplitron) downstream of the existing power amplifier (traveling wave tube), which thus became the preamplifier. At close range and for high altitudes the amplitron is switched off and the HADR works only with the traveling wave tube. In the software, a separate auxiliary constant was defined: the so-called data mile. It was derived similarly to the radar mile, except that instead of the 1 852 m for a nautical mile, the reference value of 6 000 feet was chosen.

Until the end of 2006, the secondary radar equipment was the Siemens 1990 in version D14. Since 2007, the equipment has been upgraded to the Mode S-capable MSSR 2000 I. There are a total of four HADR air defense radars in Germany. They will all be replaced by the Hensoldt program „Hughes Air Defence Radar Nachfolgesystem“ (HADR-NF).