×

Positioning system with co-polarized and cross-polarized mapping

  • US 7,427,945 B2
  • Filed: 04/11/2005
  • Issued: 09/23/2008
  • Est. Priority Date: 07/03/2003
  • Status: Active Grant
First Claim
Patent Images

1. A method of determining position performed by a mobile local positioning system, comprising:

  • transmitting at least a first electromagnetic pulse having a carrier signal frequency and a first polarization from a mobile device;

    receiving a first return signal over a respective period of time, wherein the first return signal includes at least a first return pulse from a landmark having a known position within a radar detection area of the positioning system, and the receiving includes preferentially receiving signals having the first polarization;

    processing the first return signal so as to isolate the first return pulse from the first return signal;

    transmitting a second electromagnetic pulse having the carrier signal frequency and the first polarization from the device;

    receiving a second return signal over a respective period of time, wherein the second return signal includes a second return pulse from the landmark within the radar detection area of the positioning system, and the receiving includes preferentially receiving signals having a second polarization;

    processing the second return signal so as to isolate the second return pulse from the second return signal;

    determining a range to and a characteristic of the landmark in accordance with a relative signal strength of the first return pulse and the second return pulse; and

    determining a position of the mobile device based on the range to the landmark.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×