Description of the radar set, tactical-technical characteristics
|frequency:||1250 - 1350 MHz|
|pulse repetition time (PRT):||2.5 ms|
|pulse repetition frequency (PRF):||400 Hz (staggered)|
|pulsewidth (τ):||2.5 µs|
|peak power:||5 MW|
|average power:||9 kW|
|instrumented range:||200 nautical miles (|
|range resolution:||< 400 m|
|hits per scan:|
|antenna rotation:||2 - 7.5 rpm|
The SRE-LL radar (Surveillance Radar Equipment, twin-L-Band) was developed by AEG Telefunken since 1969, the prototype was installed near Bremen (see Figure). Until 1974 five more series were delivered for a gapless radar coverage in the former western Germany. SRE-LL radars remained operational until the mid-90'ies.
The use of two antennas in back-toback configuration (the so-called “Janus-Design”) gave a better information renewal time for a given revolution rate. The reflector dimensions were 14.5 • 9 m. Both antenna halves generate a Cosecant squared antenna pattern. The lower edge of the pattern was increased by a Pencil-Beam blanked in the inner range around the radar. The total weight of the rotating parts of the antenna was 60 tons.