f
fq
Frequency
30.0000/lambda
GHz
RED
lambda
Wavelength
30.0000/fq
length
in.
R
Range to target
ft.
sigma
Target cross section
lensq
mý
PtdBm
Pt
Transmitter power
w
dBm
Dt
Antenna diameter
(10^(Gt/10)/Teff)^.5*lambda/pi
Teff
Antenna efficiency
10^(Gt/10)/(pi*Dt/lambda)^2
%
Gt
Antenna gain
10*log10((pi*Dt/lambda)^2*Teff)
dB
NF
near_field
Near field limit
Dt^2/lambda
m
FF
far_field
Far field limit
2*near_field
B
Receiver bandwidth
hz
MHz
F
Noise figure
alpha
Atmospheric absorption
LOOKUP TABLE
dB/km
SN
Signal-to-Noise ratio
10*log10(10^(Pt/10)*10^(2*Gt/10)*lambda^2*sigma*10^((-2*alpha*R/10^5)/10)/((4*pi)^3*R^4*10^(KT/10)*B*10^(F/10)))