Description
The AN/SPQ-9B is an X-Band, pulse Doppler, frequency agile radar which was designed specifically for the littoral environment. It has a very high clutter improvement factor supporting a very low false track rate in the littorals and in high clutter environments.
The AN/SPQ-9B scans out to the horizon and performs simultaneous and automatic air and surface target detection and tracking of low flying Anti-Ship Cruise Missiles (ASCMs), surface threats, and low/slow flying aircraft, UAVs and helicopters.
The radar consists of four air cooled below deck cabinets, a motor generator and one above deck Antenna unit. The antenna is designed, constructed and tested for low radar cross-section reflectivity (or signature) as required for stealth ship design and meets all MIL-STD-901D shock requirements. The AN/SPQ 9B radar is an unattended system. Preventative maintenance is scheduled for 3.5 hours per week.
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Features
The radar has 90dB of clutter rejection in the air channel and 70dB of clutter rejection in the surface channel. This provides superior sub-clutter visibility.
Above decks, the radar uses a mechanically rotating, electronically stabilized antenna. The lightweight (1,500 lbs.) antenna consists of dual planar arrays mounted back-to-back, each connected to independent transmitters and receivers.
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http://www.navy.mil/navydata/fact_display.asp?cid=2100&tid=311&ct=2
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