Radar Range Equation

2011.12.15 Takuichi Hirano

Calculator (output Pr)

Note: Please use dB Calculator to translate linear value to dB. Vice versa.

Input

Frequency f GHz
Input power (Transmitted power) Pt dBm
Distance R1 m
Distance R2 m
Gain of transmitter Gt dBi
Gain of receiver Gr dBi
Radar cross section s m2

Output

Wavelength l=c/f mm
Free-space loss factor ((4pR1R2)/l)2 dB
Effective area of transmitting antenna At=(l2/(4p))Gt mm2
Effective area of receiving antenna Ar=(l2/(4p))Gr mm2
Radar cross section s dBsm
Received power Pr  dBm

 

$B!J%3%a%s%H!K(B

$BAwl=j$,F1$8(B(R1=R2)$B$H$-(B: $B%b%N%9%?%F%#%C%/%l!<%@!<(B (Monostatic radar)
$B$=$&$G$J$$$H$-(B: $B%P%$%9%?%F%#%C%/%l!<%@!<(B (Bistatic radar)

$B#2COE@$G$NAw2$B$G$"$C$?$,!"%l!<%@!<$N>l9g$O%b%N%9%?%F%#%C%/(B(R1=R2)$B$N>l9g$r9M$($k$H<+M36u4V8:?j$O(B1/R4$B$H$J$j!"Hs>o$KBg$-$J8:?j$H$J$k!#(B

$B%l!<%@!J}$N4X?t$G$"$k!#%P%$%9%?%F%#%C%/%l!<%@!<$G$b8!CN$5$l$J$$$h$&$J%9%F%k%[email protected]!$r:n$k$N$OFq$7$$!#K\Ev$K8!CN$5$l$J$$F)L@@-$r

References

  1. C.A. Balanis: Antenna Theory, John Wiley & Sons, Inc., pp.88-90,1997.
  2. dB Calculator
  3. $B%U%j%9$NEAC#8x<0(B(Friis Transmission Equation)

Copyright(c) 2011 Takuichi Hirano

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