Thomas B Carroll

US Patent:

6370248, Apr 9, 2002

Filed:

Jul 31, 1998

Appl. No.:

09/126711

Inventors:

Thomas L. Carroll - Alexandria VA
Gregg A. Johnson - Alexandria VA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H04L 926

US Classification:

380263, 380 46, 380260, 380262, 708300

Abstract:

A system for synchronizing chaotic transmitters and receivers that is less sensitive to channel effects than other known chaotic communication methods. The system employs duplicate transmitter and receiving modules and in addition to the chaotic output a synchronizing signal which occupies a reduced bandwidth. The small bandwidth affords the system a greater resistance to the affects of frequency dependent channel distortion and noise. The broad band chaotic signal is transmitted and appears to be noise to an unauthorized listener. The receiving unit employs band pass filtering, and when the signal is received the receiver filters the chaotic signal through band pass filters which eliminate channel noise and make gain control easier to implement.

US Patent:

6631166, Oct 7, 2003

Filed:

Dec 6, 1999

Appl. No.:

09/455167

Inventors:

Thomas L. Carroll - Alexandria VA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H04L 2700

US Classification:

375259, 380 48, 380 9, 380 46, 380263, 331 78, 364717, 375364, 375367, 375359, 375316, 375343, 375377

Abstract:

A signal generator and signal receiver, as well as method of signal generation and transmission, in which selected unstable periodic orbits of a lossy chaotic system are identified and extracted, and portions of the orbits concatenated together to form a resultant signal. The selected orbits are known to the signal detector a priori. The signal detector detects the transmitted signal by correlation of the received signal with the known extracted orbits, also allowing the detector identify information which the generator imposed onto the signal.

US Patent:

6854058, Feb 8, 2005

Filed:

Apr 23, 2001

Appl. No.:

09/839146

Inventors:

Thomas L. Carroll - Alexandria VA, US

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G06F001/24

US Classification:

713168, 713200, 713201

Abstract:

The low-interference communications device uses chaotic signals which are almost periodic. A chaotic circuit driven by a sine wave signal from a function generator is produced which has narrow-band features in the power spectrum. An information signal is encoded on the chaotic signal by modulating the phase of the sine wave that drives the chaotic circuit. Periodic (narrow-band) components are then removed from the chaotic signal and the chaotic signal is transmitted to a receiver device. The chaotic signal is nonlinear, so the narrow band and broad band parts of the chaotic signal have been modulated together. The transmitted signal is relatively flat, so it will not interfere with other communications signals. At the receiver, the nonlinear chaotic signal is restored by performing a nonlinear operation on the received signal, such as squaring or cubing, to remove the narrowband components. Then the information modulated onto the narrow band component is detected.

US Patent:

8050141, Nov 1, 2011

Filed:

Nov 21, 2008

Appl. No.:

12/275355

Inventors:

Thomas L. Carroll - Alexandria VA, US
Graham K. Hubler - Highland MD, US

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01S 3/802

US Classification:

367124, 367906

Abstract:

A system and method is provided for estimating a trajectory of an incoming bullet based on the acoustics of the shock wave created as the bullet travels through the air. A first auditory signal representing a direct sound from the shock wave is recorded and its azimuthal direction is determined. Based on this azimuthal direction and other assumptions two possible bullet directions that can cause that shock wave are estimated. A second auditory signal representing a reflection of the shock wave as it travels through the air also is recorded and its azimuthal direction determined. The azimuthal direction of the ground reflection will lie between the azimuthal direction of the first auditory signal and the more correct of the two estimated trajectories, and thus can resolve the ambiguity in the estimated direction of the bullet source.

US Patent:

20050180522, Aug 18, 2005

Filed:

Feb 13, 2004

Appl. No.:

10/779553

Inventors:

Thomas Carroll - Alexandria VA, US

International Classification:

H04L027/20
H03D001/00

US Classification:

375295000, 375340000

Abstract:

A communications device includes a symbol encoder for receiving data comprising a symbol and for receiving a first signal having a positive entropy. The symbol encoder adds to the first signal a plurality of delayed versions of the first signal. Each delayed version of the plurality of delayed versions has a plurality of available values. The symbol is represented by a set of delay values, a delay value of the set of delay values including an available value of the plurality of available values for the each delayed version of the plurality of delayed versions. The communications device also includes a transmitter for receiving the encoded data from the symbol encoder and for transmitting the encoded data. For example, the first signal having positive entropy includes a chaotic signal, noise signal, or a positive entropy, baseband signal modulated onto a positive entropy signal having a higher frequency than the baseband signal. For example, the chaotic signal includes a Lorenz system-generated chaotic signal or a Rossler system-generated chaotic signal. The communications device supports bandwidth-efficient transmission in communications media.

US Patent:

20100250955, Sep 30, 2010

Filed:

Oct 22, 2009

Appl. No.:

12/589372

Inventors:

Paul Trevithick - Chestnut Hill MA, US
Drummond Reed - Seattle WA, US
Markus Sabadello - Vienna, AT
Thomas Carroll - Norwood MA, US
John Bradley - Cultus Lake, CA
Brian Walker - Holden MA, US

International Classification:

H04L 9/32
G06F 7/04
G06F 21/00

US Classification:

713185, 726 5, 726 9

Abstract:

A brokered information sharing system including a primary broker configured with software to store cards of a principal, to transmit the cards when requested by the principal, to authenticate the principal, and to provide a master authentication of the principal to at least one issuing party. A selector is used by the principal and is configured with software to provide authentication of the principal to the primary broker, and to request and receive cards from the primary broker.

US Patent:

20100274645, Oct 28, 2010

Filed:

Nov 12, 2009

Appl. No.:

12/590679

Inventors:

Paul Trevithick - Chestnut Hill MA, US
Drummond Reed - Seattle WA, US
Markus Sabadello - Vienna, AT
Thomas Carroll - Norwood MA, US
John Bradley - Cultus Lake, CA
Brian Walker - Holden MA, US

International Classification:

G06Q 30/00

US Classification:

705 145, 705 1449, 705 1461

Abstract:

A user directed advertisement network includes an ad server having a database for storing advertisements from one or more vendors, and a broker configured with software to receive and store claims including information of advertisement preferences of a principal, and based upon at last one claim to provide to the principal one or more advertisements stored on the ad server that relate to the preferences of the principal. An agent used by the principal and configured with software to provide the claims including the information of the advertisement preferences to the broker, and to receive the advertisements from the broker.

US Patent:

57336113, Mar 31, 1998

Filed:

Mar 29, 1995

Appl. No.:

8/413065

Inventors:

Garrett S. Thurston - Lowell MA
Raymond J. Suplinskas - Haverhill MA
Thomas J. Carroll - Salem NH
Donald F. Connors - Tewksbury MA
David T. Scaringella - Franklin MA
Richard C. Krutenat - Belmont MA

Assignee:

Textron Systems Corporation - Wilmington MA

International Classification:

H05B 602

US Classification:

427591

Abstract:

A porous preform is densified by heating while emersed in a precursor liquid. Heating is achieved by passing a current through the preform or by an induction coil immersed in the liquid. Ways to control the densification process are also described.