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Math Help - Horizon Calcs

  1. #1
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    Horizon Calcs

    For a hydrographic survey it was proposed to fix the horizontal position of the sounding vessel by measuring distances from ship to shore. A microwave Hydrodist master station located in the sounding vessel ox to measure to two remote stations located on fixed stations.

    One of the remote instruments is located on a tripod 1.5 above a station R.L of 0.307 A.H.D.

    If the EDM ray is to clear the mean seal level by 0.5m and it is required to measure a maximum distance of 8Km, at what height above the waterline must the transmitter be placed in the sounding vessel.
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by Wildman View Post
    For a hydrographic survey it was proposed to fix the horizontal position of the sounding vessel by measuring distances from ship to shore. A microwave Hydrodist master station located in the sounding vessel ox to measure to two remote stations located on fixed stations.

    One of the remote instruments is located on a tripod 1.5 above a station R.L of 0.307 A.H.D.

    If the EDM ray is to clear the mean seal level by 0.5m and it is required to measure a maximum distance of 8Km, at what height above the waterline must the transmitter be placed in the sounding vessel.
    I would suggest you rewrite this trying for more clarity, for a start don't use unexplained abreviations.

    CB
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  3. #3
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    Formula H= (1-2k)Dē
    2R

    K=0.061 and R 6370100m
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  4. #4
    Grand Panjandrum
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    Quote Originally Posted by Wildman View Post
    Formula H= (1-2k)Dē
    2R

    K=0.061 and R 6370100m
    Please post the question expressed without unexplained abreviations and variables.

    Also if you think R is the radius of the Earth, you need to use a 4/3-Earth value to allow for refraction at microwave frequencies.

    CB
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