SRE-M
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The SRE-M radar (SREM: Surveillance Radar Equipment Medium-range) is a typical air traffic control radar operating in the D-band (formerly called L-band). These long-range radar devices ( en-route radar ) monitor air traffic outside the special areas of the airport.
The history of the SRE-M radar family began in the early 1950s when the Federal Agency for Air Traffic Control (from 1993: Deutsche Flugsicherung GmbH ) wanted to purchase GCA systems from the US company Bendix Corporation to monitor civil air traffic . These airport surveillance radar ASR-3 in S-band at 10 cm wavelength in connection with the precision approach radar PAR-2 were manufactured with a Bendix license from Telefunken GmbH ( Ulm ). For monitoring outside the airport areas ( en-route radar ), Telefunken developed three systems of the type GRS (large round search radar) with a range of 120 NM ( nautical miles equal to 220 km) and an altitude detection of 14 in the late 1950s km working in the L-band at 23 cm wavelength.
The development of the successor SRE-LL (LL: symbolic for two diametrically used antenna reflectors in the L-band ) at Telefunken began in 1968/69; the prototype was installed in Bremen in 1972. The five series systems were in operation until the mid-1990s.
From 1975 to 1978 Telefunken developed the first coherent radar called SRE-M5 with a klystron as the transmitter output stage. It allowed distance measurements up to 250 NM (450 km) and an altitude detection of 25 km. The technology was successfully sold in many countries (including Great Britain, Belgium, Austria, Kuwait, Libya) and later equipped with a semiconductor-based modulator as the SRE-M6 . The further development of radar for air traffic control was stopped at Telefunken in 1984.
In the subsequent modernization in the early 1990s, the classic MTI system was replaced by an MTD Doppler Processor. This new system was subsequently named SRE-M7. Finally, the SRE-M8 followed, which also received a transmitter in semiconductor technology and a digital pulse compression filter .
The large horizontal antenna field above the parabolic antenna reflector is the antenna of the secondary radar , also known as the “beacon” antenna. This is an LVA antenna . A rectangular wind deflector behind the parabolic reflector ensures that the two drive motors are loaded more evenly in strong winds.
SREM locations in Germany
According to the DFS brochure from May 1999, six systems are currently in operation in Germany:
( MSSR : Monopulse Secondary Surveillance Radar)
- MSSR Nordholz
- MSSR Schmooksberg
- MSSR Deister
- MSSR Auersberg
- MSSR Neunkircher Höhe
- MSSR Großhaager Forst (west of Maitenbeth )
| Technical data SRE-M | |
|---|---|
| Frequency range | 1250-1350 MHz |
| Pulse repetition time | |
| Pulse repetition frequency | 310 and 480 Hz |
| Transmission time (PW) | 2 µs |
| Reception time | |
| Dead time | |
| Pulse power | > 2.5 MW |
| Average performance | |
| displayed distance | 220 NM (400 km) |
| Distance resolution | 1000 m |
| Opening angle | 1.1 ° |
| Hit count | |
| Antenna round trip time | 11.62 to 11.80 s |
swell
- E. Thiele (Ed.): Telefunken after 100 years: the legacy of a German global brand . Nicolai, Berlin 2003
- Positioning in air traffic , DFS brochure, May 1999 (pdf, 820 kB)
Web links
www.forgottenplaces.de , the former location of an SRE-LL system in Boostedt / Schwienhagen