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Detecting RCS

  1. Sep 10, 2012 #1
    A fighter jet has 1 m^2 rcs and is located at 200nmi. Where would a flock of birds with 0.0015 m^2 rcs should be located in order to have the same detectability?
     
  2. jcsd
  3. Sep 10, 2012 #2

    jedishrfu

    Staff: Mentor

    isn't this a simple ratio with spherical areas?

    1 / ( 4 pi (200)^2 ) = 0.0015 / ( 4 pi x^2 )
     
  4. Sep 10, 2012 #3
    Are you referring to the 4th root equation for radar range ?

    ((0.0015/1)^(0,25))*370,4=72,89 km or 32 NMI
     
  5. Sep 11, 2012 #4

    jedishrfu

    Staff: Mentor

    I was thinking that the RCS is a % of a larger spherical surface. So the jet has an RCS 1sq meter at 200 nmi. Figure what % is 1 sq meter to the total surface area of the sphere of radius 200nmi (converted to 370636.8 meters).

    1 / ( 4 * pi * ( 370636.8 )^2 ) = 5.80e-13 percent

    0.0015 / (5.80e-13 % ) =4 * pi * r^2

    and r = 45068.86 meters = 24.32 nmi
     
  6. Sep 11, 2012 #5
    Ok , got it . Thank You.
     
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