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:
Sep. 23, 2014
Filed:
Jun. 13, 2012
Per K. Enge, Mountain View, CA (US);
Bart Ferrell, Troy, IL (US);
Gregory M. Gutt, Ashburn, VA (US);
James C. Lassa, Leesburg, VA (US);
Michael A. Rizzo, Orange, CA (US);
David A. Whelan, Newport Coast, CA (US);
Per K. Enge, Mountain View, CA (US);
Bart Ferrell, Troy, IL (US);
Gregory M. Gutt, Ashburn, VA (US);
James C. Lassa, Leesburg, VA (US);
Michael A. Rizzo, Orange, CA (US);
David A. Whelan, Newport Coast, CA (US);
The Boeing Company, Chicago, IL (US);
Abstract
A method, system, and apparatus are disclosed for multipath isolation through the combined use of antenna diversity and frequency diversity. In particular, the present disclosure utilizes antenna diversity and frequency diversity to combat the deleterious effects of reflected signals on the positioning accuracy of satellite navigation systems. In at least one embodiment, the present disclosure uses two antennas and two frequencies for operation with a satellite navigation system. The present disclosure segregates the antennas and frequencies into two classes: references and monitors. The reference measurements are used for estimating the state of the vehicle, and the monitor measurements are used to detect faults that might degrade the reference estimation. Thus, the present disclosure enables an improvement in the positioning error experienced by roving users in downtown and indoor environments. Applications include positive train control, aircraft surface guidance, marine craft navigation in canals and ports, as well as automotive lane keeping.