07372400 is referenced by 52 patents and cites 15 patents.

A navigation system provides a significant level of protection against all forms of interference or jamming to GPS in a cost-effective way. The system employs a network of ground reference stations and Low Earth Orbiting (LEO) satellites in conjunction with GPS. A common-view ranging geometry to a GPS satellite is established that links a reference station and a user. A second common-view geometry to a LEO satellite between the same reference station and user pair is also established. The ground stations synthesize real-time aiding signals by making carrier phase measurements of GPS the LEO satellite signals. This aiding information is transmitted via the LEO satellites to the user receiver at high power to penetrate ambient jamming. The user receiver locks onto the carrier phase of the LEO satellite, demodulates the aiding information, then applies the carrier phase measurements and the aiding information to enable extended coherent measurements of the GPS signals. The system thereby recovers the GPS signals that would otherwise be lost to the jamming.

Title
Methods and apparatus for a navigation system with reduced susceptibility to interference and jamming
Application Number
11/268317
Publication Number
7372400 (B2)
Application Date
November 7, 2005
Publication Date
May 13, 2008
Inventor
David A Whelan
Newport Coast
CA, US
Barton G Ferrell
Troy
IL, US
Brent M Ledvina
Austin
TX, US
William J Bencze
El Granada
CA, US
Gregory M Gutt
Brambleton
VA, US
Mark L Psiaki
Brooktondale
NY, US
Robert W Brumley
Narberth
PA, US
Clark E Cohen
Washington
DC, US
Agent
Ingrassia Fisher & Lorenz P C
Assignee
The Boeing Company
IL, US
IPC
G01S 1/00
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