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Description

The 3D operation of the MMSR is based on the multiple stacked beam coverage technique, taking the advantage of searching a wide elevation sector at a time, thus making available the required high data renewal rate. The radar operates in S-band, employing a TWT transmitter of low peak power (10 kW), but high enough average power. Linear frequency modulated (LFM) pulses are transmitted, then compressed on reception in the fully coherent transmit/receive system. The high-speed PLL frequency synthesiser provides flexible frequency agility, while maintaining high spectral quality which is a necessary condition for effective Doppler filtering of strong ground clutter. The antenna unit incorporates the primary radar antenna, IFF antenna (back to back) and the IFF transceiver inside the housing. The radar antenna produces a single transmit beam and 5 receiving beams, covering an elevation sector wide enough to reduce gaps in coverage, which can occur when the vehicle is not precisely levelled. The whole receiving system, beginning with the antenna row-based LNAs, is subject to automatic testing and calibration governed by the signal processing unit.