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Method of simultaneously measuring orthometric and geometric heights

  • US 5,030,957 A
  • Filed: 02/26/1991
  • Issued: 07/09/1991
  • Est. Priority Date: 02/26/1991
  • Status: Expired due to Fees
First Claim
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1. A method of simultaneously determining relative orthometric and geometric heights comprising the steps of:

  • continuously transmitting encoded radio frequency (RF) signals from a plurality of Global Positioning System (GPS) earth-orbiting satellites, such that the transmitted RF signals of each GPS earth-orbiting satellite are a pair of encoded RF signals at predetermined frequencies that are directed in a radial direction towards the earth'"'"'s surface, all GPS satellites of the plurality of satellites progressively and continuously advancing about the earth in relation to the field of view of a GPS receiver;

    measuring, based upon the encoded RF signals, a first height differential between the earth'"'"'s surface and a reference surface, said first height differential being measured over the length of a baseline of said reference surface; and

    simultaneously surveying the earth'"'"'s surface along said reference baseline to determine a second height differential between the earth'"'"'s surface and a geoid line representative of mean sea level.

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