SRE-M

The SRE-M is an Air Traffic Control (ATC) radar manufactured by Deutsche Aerospace AG. Its development history began after World War II with the licensed production of a Bendix ground radar system in 1956, followed by the DASA-developed SRE-LL in the 1960s and early 1970s. The SRE-M family started with the SRE-M5 in 1976, a coherent system featuring a klystron transmitter, which was later upgraded in the early 1990s to the SRE-M6 with a modular solid-state modulator. Further enhancements led to the SRE-M7, which incorporated an MTD (Moving Target Detection) Doppler processor instead of MTI (Moving Target Indication), and the SRE-M8, which features a solid-state transmitter and digital pulse compression filters. The SRE-M radar antenna combines an upper cosecant-squared pattern and a lower pencil beam pattern for transmission, forming a variable pattern in receiving mode, with vertical/circular switchable polarization. The SRE-M6 utilizes up to an eight-fold staggered pulse repetition frequency, while the SRE-M7 uses up to a three-fold staggered PRF, both with a diversity frequency offset. The SRE-M8, with its solid-state transmitter, transmits pulses of varying durations. The radar operates at frequencies between 1250 and 1350 MHz, with a pulse repetition frequency of 310-480 Hz, a pulse width of 2 µs, and a peak power exceeding 2.5 Megawatts. It has an instrumented range of 400 km, a range resolution of 1 km, and a beamwidth of 1.1 degrees, with an antenna rotation period of 5-12 seconds. A Large Vertical Aperture (LVA) antenna for the Secondary Surveillance Radar (SSR) is integrated into the main antenna reflector.

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