Patents by Inventor John Duncan Toone

John Duncan Toone has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and apparatus for calibrating location finding equipment within a communication system
    Patent number: 6014102
    Abstract: Error vectors are added to any position estimate determined by Location finding equipment (LFE) in order to give a corrected position estimate. Error vectors are determined utilizing calibration terminals (114), which are roaming vehicles that move throughout the communication system's (100) coverage area. Each calibration terminal (114) comprises a remote unit (113) coupled with an independent position determining system (167) such as a Global Positioning System (GPS) receiver. Error vectors are determined by periodically polling calibration terminals (114). In response, each terminal (114) sends back a reply message containing their actual, independently determined location, along with periodically broadcasting a known sequence at increased power utilized by the LFE in determining a position estimate of the calibration terminal (114). The difference between the actual, and LFE determined position estimates are utilized in calculation of error vectors.
    Type: Grant
    Filed: April 17, 1998
    Date of Patent: January 11, 2000
    Assignee: Motorola, Inc.
    Inventors: James Edward Mitzlaff, John Duncan Toone