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MODULE A- INTRODUCTION TO RADAR Target Echo Signal @ Radar Received (echo) power at the radar Figure -2.8: Received power at radar. Relationship between Antenna Aperture and Gain Figure -2.9: Antenna aperture and gain. Where A= the physical aperture area of the antenna ρ a =the aperture collection efficiency TURKEY RADAR TRAINING 1.0 / ALANYA 2005 15
MODULE A- INTRODUCTION TO RADAR λ= the electromagnetic wave length Idealized Radar Equation - no system losses Since the antenna gain is the same for transmit & receive, this becomes : Practical Radar Equation - with system losses for point targets Where: • Lsys = the system losses expressed as a power ratio • P r is the average received power • P t is the transmitted power • G is the gain for the radar • λ is the radar's wavelength • σ is the targets scattering cross section • R is the range from the radar to the target • L sys: is system losses. 16 TURKEY RADAR TRAINING 1.0 / ALANYA 2005
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