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Can you explain TRIGONOMETRY equation [HELP]

  1. Apr 18, 2013 #1
    The signal length from the satellite to the earth station can be found as

    2(hs-he)/[{sin^2(theta)+(2(hs-he)/Re)}^1/2+sin(theta)] if theta < 5 degrees Due to the earth projection

    where "hs" is satellite height and "he" is the earth station height and Re is the earth radius=3700 Km

    My question is Can you help me to derive this equation? how they have obtained it?

  2. jcsd
  3. Apr 18, 2013 #2


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    welcome to pf!

    hi rihanna! welcome to pf! :smile:

    first, draw a clearly marked diagram :wink:

    (including the centre of the earth)
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