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Cellphone stabilization of EDM instruments

  • US 20050124287A1
  • Filed: 12/09/2003
  • Published: 06/09/2005
  • Est. Priority Date: 12/09/2003
  • Status: Abandoned Application
First Claim
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1. A surveying instrument, comprising:

  • an electronic distance meter (EDM) having an EDM transmitter for launching an out-bound signal to a distant target and an EDM receiver for receiving a reflected signal from said distant target;

    a phase measurement device connected to the reference oscillator and to both said EDM transmitter and EDM receiver and providing for a time measurement of the difference between said out-bound signal and said reflected signal from which a distance-to-target measurement can be computed;

    a reference oscillator that provides a timing basis for the phase measurement device and that can be trained by an external precision frequency standard; and

    a cellphone connected to receive cellular telephone base station transmissions and to extract there from frequency stabilization information for use by the reference oscillator.

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