The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 23, 2007
Filed:
Jul. 03, 2003
Andrea Woo, Legal Representative, Orange, CA (US);
Russell Woo, Legal Representative, Palo Alto, CA (US);
Mark Lindsay Rentz, Torrance, CA (US);
Scott Adam Stephens, Phoenix, AZ (US);
Mark Phillip Kaplan, Culver City, CA (US);
Andrea Woo, legal representative, Orange, CA (US);
Russell Woo, legal representative, Palo Alto, CA (US);
Mark Lindsay Rentz, Torrance, CA (US);
Scott Adam Stephens, Phoenix, AZ (US);
Mark Phillip Kaplan, Culver City, CA (US);
Navcom Technology Inc., Torrance, CA (US);
Abstract
A positioning system includes a plurality of devices configured to exchange RF signals with one another. A first device periodically receives a message from each other device during time slots assigned them. The received message includes information representing a time of arrival at the other device of a respective message transmitted by the first device. A time of arrival of the message from each of the other devices is determined by the first device. The first device periodically transmits messages to the other devices, each transmitted message including information representing the determined time of arrival for at least one of the other devices. A range from the first device to each of a plurality of the other devices is determined as function of the determined time of arrival of the message from the other device and the time of arrival information in the message from the other device.