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Geolocation with radio-frequency ranging

  • US 9,766,322 B2
  • Filed: 03/14/2013
  • Issued: 09/19/2017
  • Est. Priority Date: 03/14/2013
  • Status: Active Grant
First Claim
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1. A system comprising:

  • an originator device configured to transmit a first wireless signal to a transponder device;

    the transponder device is configured to transmit a second wireless signal to the originator device;

    at least one observer device configured to receive the first wireless signal from the originator device and receive the second wireless signal from the transponder device, andat least one processor configured to calculate a transactional difference range at the at least one observer device based on the first wireless signal received at the observer device and the second wireless signal received at the observer device,wherein the at least one processor is further configured to calculate the transactional difference range at the observer device bymeasuring an observer time difference, corresponding to the time period between receiving the first wireless signal at the observer device and receiving the second wireless signal at the observer device,measuring a first phase value, corresponding to the phase of the first wireless signal received at the observer device, andmeasuring a second phase value, corresponding to the phase of the second wireless signal received at the observer device.

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