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Accurate geographic tracking of mobile devices

  • US 10,642,560 B2
  • Filed: 02/11/2016
  • Issued: 05/05/2020
  • Est. Priority Date: 02/13/2015
  • Status: Active Grant
First Claim
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1. A system for tracking mobile devices in real time comprising:

  • first and second multifrequency radio frequency (RF) transmitters disposed at known positions, each multifrequency RF transmitter transmitting a multifrequency RF signal conveying identification and the known position of that multifrequency RF transmitter; and

    a mobile device with a known heading and orientation and disposed within a maximum unambiguous range of the multifrequency RF transmitters, the mobile device comprising;

    a user display that provides images to a user as viewed from a viewpoint;

    at least two mobile display antennae, each antenna mounted on the display at a known spatial separation from each other antenna, the at least two mobile display antennae being adapted to receive the multifrequency RF signals transmitted by the first and second multifrequency RF transmitters;

    a receiver circuit having a carrier recovery circuit that functions to synchronize the multifrequency RF signals received by each of the at least two mobile display antennae, compare phases of multiple frequencies of each multifrequency RF signal received by each of the at least two mobile display antennae and determine phase differences between the compared phases; and

    a processor, coupled to the receiver circuit, programmed to;

    receive the phase differences from the receiver circuit;

    calculate a distance from each multifrequency RF transmitter to each of the at least two mobile display antennae based on the phase differences;

    calculate a position of each of the at least two mobile display antennae based on the calculated distances, the known positions of the multifrequency RF transmitters, the known spatial separation between the at least two mobile display antennae and the known heading and orientation of the mobile device; and

    cause a change in the viewpoint of the images provided to the user on the user display of the mobile device using the calculated positions of each of the at least two mobile display antennae.

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