T. Bullet - lisn

Fresnel ZoneD, AThe area over which radio reflections return “in phase”and contribute to the radar returnD= RRA== 4 RExamplesS= P t G t G r 3256 2 R 3●●R=100 km, λ=15m●D=1.2 km, A=60 dBsmR=400 km, λ=15m1256 2 =−34dB●●D=2.5 km, A=66 dBsmR=100 km, λ=300m 3R 3=−94dB●●D=5.5 km, A=75 dBsmR=400 km, λ=300mHF Radar300 m wavelength400 km range●D=11.0 km, A=80 dBsm