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Method and system for determining precise robotic position and orientation using near-simultaneous radio frequency measurements

  • US 9,722,640 B2
  • Filed: 01/06/2015
  • Issued: 08/01/2017
  • Est. Priority Date: 01/06/2015
  • Status: Active Grant
First Claim
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1. A method for establishing a reference grid and locating an object within the reference grid, the method comprising:

  • receiving, by at least one anchor node of a plurality of anchor nodes in a network, an indication that a selected anchor node is to function as a master anchor node;

    transmitting, by the master anchor node, a ranging message as an ultra-wideband (UWB) signal;

    receiving, by the master anchor node, a ranging message response from each of the plurality of anchor nodes in the network;

    generating, by the master anchor node, a reference grid representing physical locations of the plurality of anchor nodes within the network based upon the received ranging message responses;

    distributing, by the master anchor node, the reference grid to each of the plurality of anchor nodes;

    determining, by the master anchor node, a distance between each pair of the plurality of anchor nodes;

    establishing, by the master anchor node, a coordinate plane using at least three of the plurality of anchor nodes as edge defining points within the coordinate plane;

    mapping, by the master anchor node, each of the plurality of anchor points within the coordinate plane based upon trilateration information related to each of the plurality of anchor points;

    identifying, by the master anchor node, a first closest anchor node from the plurality of anchor nodes, wherein the first closest anchor node is located at a position physically closest to the master anchor node within the network;

    identifying, by the master anchor node, a second closest anchor node from the plurality of anchor nodes, wherein the second closest anchor node is located at a position physically second closest to the master anchor node within the network;

    generating, by the master anchor node, a reference sample point midway between the first closest anchor node and the second closest anchor node;

    creating, by the master anchor node, best fit position sets for at least a portion of the plurality of anchor nodes based upon a location of the reference sample point; and

    generating, by the master anchor node, a refined reference grid based upon the best fit position sets.

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