11-08-2012, 02:06 PM
FREQUENCY MODULATED CONTINUOUS WAVE RADAR
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DEFINATION
It is a radar system where a known stable frequency continuous wave radio energy is modulated by a triangular modulation signal so that it varies gradually and then mixes with the signal reflected from a target object with this transmit signal to produce a beat signal.
Advantages
FMCW is less complex, safer and lower cost than PD
FMCW gives low false alarm rates
FMCW sees a higher percentage of valid targets
Won’t miss slower targets or tangential ones – no holes in coverage – no one penetrates
Smaller beamwidth for better pointing of cameras
Disadvantage
Reduced range compared to pulse radar
More expensive than competing technologies
More expensive than competing technologies
Can require more computing power than pulse-Doppler system
Can be jammed
May be subject to licensing and regulations
Application
Radar Altimeter