Barton G Ferrell

7042392, May 9, 2006

Nov 24, 2003

10/720736

David A. Whelan - Newport Coast CA, US
Gregory M. Gutt - Leesburg VA, US
Barton G. Ferrell - Troy IL, US
Clark Cohen - Washington DC, US

The Boeing Company - Chicago IL

H04B 7/185
G01S 5/02

34235715, 34235716

This invention describes a means for acquiring GPS P/Y code under jamming conditions. It improves jam resistance by augmenting a component of the GPS signal with one from a different satellite system, such as a low earth orbiting (LEO) satellite. The preferred embodiment of this invention employs the Iridium LEO satellite constellation broadcasting in a 10 MHz wide band about 1,621 MHz. A low-cost, integrated Iridium receiver coupled to the GPS receiver employs a single antenna that is capable of receiving both the GPS and Iridium signals together.

7372400, May 13, 2008

Nov 7, 2005

11/268317

Clark E. Cohen - Washington DC, US
Robert W. Brumley - Narberth PA, US
Mark L. Psiaki - Brooktondale NY, US
Gregory M. Gutt - Brambleton VA, US
William J. Bencze - El Granada CA, US
Brent M. Ledvina - Austin TX, US
Barton G. Ferrell - Troy IL, US
David A. Whelan - Newport Coast CA, US

The Boeing Company - Chicago IL

G01S 1/00

34235701, 34235706, 34235716, 701213

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.

7489926, Feb 10, 2009

Jun 29, 2004

10/879256

David A. Whelan - New Port Coast CA, US
Clark E. Cohen - Washington DC, US
Greg M. Gutt - Leesburg VA, US
Barton G. Ferrell - Troy IL, US

The Boeing Company - Chicago IL

H04Q 7/20

455427, 4554561, 455 121, 4554566

A method for estimating a precise position of a user device from signals from a low earth orbit (LEO) satellite includes receiving at least one carrier signal at a user device, each carrier signal being transmitted a distinct LEO satellite. The user device processes the carrier signals to obtain a first carrier phase information. The user device recalls an inertial position fix derived at an inertial reference unit. The user device derives a position of the user device based on the inertial position fix and the first carrier phase information.

7554481, Jun 30, 2009

May 16, 2007

11/749667

Clark E. Cohen - Washington DC, US
David A. Whelan - Newport Coast CA, US
Robert W. Brumley - Narbeth PA, US
Gregory M. Gutt - Ashburn VA, US
Barton G. Ferrell - Troy IL, US

The Boeing Company - Chicago IL

H04K 3/00
H04B 1/66
G01S 3/00

342 14, 342 13, 34235716, 455 1, 455102

Various approaches to localized jamming of navigation signals are provided. In one embodiment, a navigation signal comprises at least a portion of a low earth orbit (LEO) signal provided by a LEO satellite. A noise source is filtered to provide a plurality of filtered noise signals in a plurality of frequency bands. The navigation signal is spread over a plurality of channels of the LEO signal. The channels are distributed over the frequency bands and a plurality of time slots. A pseudo random noise (PRN) sequence is generated. The filtered noise signals are modulated using the PRN sequence to provide a plurality of modulated noise signals. The modulated noise signals are broadcast over an area of operations to provide a plurality of jamming bursts corresponding to the navigation signal. The jamming bursts are configured to substantially mask the navigation signal in the area of operations.

7579987, Aug 25, 2009

May 16, 2007

11/749627

Clark E. Cohen - Washington DC, US
David A. Whelan - Newport Coast CA, US
Robert W. Brumley - Narberth PA, US
Gregory M. Gutt - Ashburn VA, US
Barton G. Ferrell - Troy IL, US

The Boeing Company - Chicago IL

G01S 1/00

34235715

Low earth orbit (LEO) satellites are used to provide navigation signals. In one embodiment, a method of providing a LEO signal from a LEO satellite includes providing a plurality of transmit channels over a plurality of transmit slots. The transmit channels comprise a set of communication channels and a set of navigation channels. The method also includes generating a first pseudo random noise (PRN) ranging overlay corresponding to a navigation signal. The method further includes applying the first PRN ranging overlay to a first set of the navigation channels. In addition, the method includes combining the communication channels and the navigation channels into a LEO signal. The method also includes broadcasting the LEO signal from the LEO satellite.

7583225, Sep 1, 2009

May 16, 2007

11/749652

Clark E. Cohen - Washington DC, US
David A. Whelan - Newport Coast CA, US
Robert W. Brumley - Narberth PA, US
Gregory M. Gutt - Ashburn VA, US
Barton G. Ferrell - Troy IL, US

The Boeing Company - Chicago IL

G01S 5/14
H04B 7/19

34235716, 455 133, 455430

A low earth orbit (LEO) satellite data uplink is provided. In one embodiment, a method of providing a data uplink to a LEO satellite includes determining position information using a LEO signal received from the LEO satellite, a first ranging signal received from a first ranging source, and a second ranging signal received from a second ranging source. The method also includes determining a timing advance parameter using a local clock reference and a LEO satellite clock reference. The method further includes preparing a data uplink signal comprising uplink data to be broadcast to the LEO satellite. In addition, the method includes synchronizing the data uplink signal with the LEO satellite using the timing advance parameter. The method also includes broadcasting the data uplink signal to the LEO satellite.

7859455, Dec 28, 2010

Jan 6, 2009

12/349362

Gregory M. Gutt - Ashburn VA, US
David A. Whelan - Newport Coast CA, US
Barton G. Ferrell - Troy IL, US
Robert W. Brumley - Narberth PA, US
Christopher J. Martens - Creve Coeur MO, US
Anne T. Haddad - Berwyn PA, US

The Boeing Company - Chicago IL

G01S 19/23
G01S 19/25
G01S 19/30

34235762, 34235764, 34235769

Various techniques are provided for calibrating a frequency of a local clock using a satellite signal. In one example, a method of transferring frequency stability from a satellite to a device includes receiving a signal from the satellite. The method also includes determining a code phase from the satellite signal. The method further includes receiving aiding information. In addition, the method includes calibrating a frequency of a local clock of the device using the code phase and the aiding information to substantially synchronize the local clock frequency with a satellite clock frequency.

7952518, May 31, 2011

May 30, 2008

12/130880

David A. Whelan - Newport Coast CA, US
Robert W. Brumley - Narberth PA, US
Gregory M. Gutt - Ashburn VA, US
Barton G. Ferrell - Troy IL, US

The Boeing Company - Chicago IL

G01S 19/25
G01S 19/46

34235729, 34235742, 34235764

Systems and methods according to various embodiments provide for navigation in attenuated environments by integrating satellite signals with Internet hotspot signals. In one embodiment, a receiver unit adapted to perform geolocation comprises an antenna adapted to receive a precision time signal from a satellite and receive additional aiding information from a wireless network station, wherein the precision time signal comprises a periodic repeating code. The receiver unit also comprises a processor and a memory adapted to store a plurality of computer readable instructions which when executed by the processor are adapted to cause the receiver unit to: use the precision time signal and the aiding information to determine a precise absolute time, determine positioning information associated with the receiver unit, use the positioning information to request location information of the wireless network station, and determine an absolute geolocation of the receiver unit using the positioning information and the location information.