Lawrence P Doyle

US Patent:

6453168, Sep 17, 2002

Filed:

Aug 2, 1999

Appl. No.:

09/365702

Inventors:

Dennis D. McCrady - Holmdel NJ
Lawrence J. Doyle - Hazlet NJ
Howard Forstrom - Fairlawn NJ

Assignee:

ITT Manufacturing Enterprises, Inc - Wilmington DE

International Classification:

H04B 700

US Classification:

455517, 455506, 455 65, 4552772, 455456, 342457, 375347

Abstract:

A spread spectrum position location communication system determines the position of a mobile master radio using a round-trip messaging scheme in which the time of arrive (TOA) of ranging messages is accurately determined to yield the range estimates required to calculate the position of the mobile radio via trilateration. The master radio transmits outbound ranging messages to plural reference radios which respond by transmitting reply ranging messages. Upon reception of the reply ranging message, the master radio determines the range to the reference radio from the signal propagation time calculated by subtracting the far-end turn around time from the round-trip elapsed time. Any combination of fixed or mobile radios of known positions can be used as the reference radios for another mobile radio in the system, thereby providing adaptability under varying transmission conditions. The individual radios do not need to be synchronized to a common time reference, thereby eliminating the need for highly accurate system clocks. By performing internal delay calibration, errors caused by difficult-to-predict internal transmitter and receiver delay variations can be minimized.

US Patent:

6665333, Dec 16, 2003

Filed:

Apr 29, 2002

Appl. No.:

10/133368

Inventors:

Dennis D. McCrady - Holmdel NJ
Lawrence J. Doyle - Hazlet NJ
Howard Forstrom - Fairlawn NJ

Assignee:

ITT Manufacturing Enterprises, Inc. - Wilmington DE

International Classification:

H04B 1707

US Classification:

375147, 375141

Abstract:

A spread spectrum position location communication system determines the position of a mobile master radio using a round-trip messaging scheme in which the time of arrive (TOA) of ranging messages is accurately determined to yield the range estimates required to calculate the position of the mobile radio via trilateration. The master radio transmits outbound ranging messages to plural reference radios which respond by transmitting reply ranging messages. Upon reception of the reply ranging message, the master radio determines the range to the reference radio from the signal propagation time calculated by subtracting the far-end turn around time from the round-trip elapsed time. Any combination of fixed or mobile radios of known positions can be used as the reference radios for another mobile radio in the system, thereby providing adaptability under varying transmission conditions. The individual radios do not need to be synchronized to a common time reference, thereby eliminating the need for highly accurate system clocks. By performing internal delay calibration, errors caused by difficult-to-predict internal transmitter and receiver delay variations can be minimized.

US Patent:

6741633, May 25, 2004

Filed:

Mar 11, 1999

Appl. No.:

09/266360

Inventors:

Gene L. Cangiani - Parsippany NJ
Lawrence J. Doyle - Hazlet NJ

Assignee:

ITT Manufacturing Enterprises, Inc. - Wilmington DE

International Classification:

H04B 169

US Classification:

375132

Abstract:

A new signal format that allows sharing of spectrum with CDMA signals with a minimum amount of mutual interference and a maximum amount of processing gain. The method including the step of coherently frequency hopping a narrow band signal adapted to minimize interference with a main lobe of the CDMA code over the allocated bandwidth. A particular application of this provides a method for enabling a global positioning device adapted to receive an allocated bandwidth to directly acquire a to P(Y) code when an associated C/A signal is effectively jammed.

US Patent:

6801782, Oct 5, 2004

Filed:

Feb 6, 2001

Appl. No.:

09/777625

Inventors:

Dennis D. McCrady - Holmdel NJ
Peter Cummiskey - Clark NJ
Lawrence J. Doyle - Hazlet NJ
Howard Forstrom - Fairlawn NJ

Assignee:

ITT Manufacturing Enterprises, Inc. - Wilmington DE

International Classification:

H04Q 700

US Classification:

455517, 455506, 455 65, 4552772, 4554561, 455457, 375347, 3424571

Abstract:

A position location communication system determines the position of a mobile master radio using a round-trip messaging scheme in which the time of arrive (TOA) of ranging signals is accurately determined to yield the range estimates required to calculate the position of the mobile radio. The master radio transmits ranging signals to plural reference radios which respond by transmitting reply ranging signals. Upon reception of the reply ranging signal, the master radio determines the range to the reference radio from the signal propagation time. Any combination of fixed or mobile radios having known positions can be used as the reference radios for another mobile radio in the system. Individual radios do not need to be synchronized to a common time reference, thereby eliminating the need for highly accurate system clocks. Errors in TOA estimates are minimized by performing internal delay calibration, Doppler compensation, leading-edge-of-the-signal curve fitting and frequency diversity techniques.

US Patent:

6861982, Mar 1, 2005

Filed:

Aug 16, 2001

Appl. No.:

09/930165

Inventors:

Howard Scott Forstrom - North Haledon NJ, US
Dennis D. McCrady - Holmdel NJ, US
Lawrence J. Doyle - Hazlet NJ, US

Assignee:

ITT Manufacturing Enterprises, Inc. - Wilmington DE

International Classification:

G01S001/24
G01S003/02

US Classification:

342387, 342463, 342465

Abstract:

The position of a non-cooperating emitter is determined by detecting a signal from the emitter at three or more receiver communication devices positioned at different locations. The receiver communication devices determine respective detection times of the emitted signal in respective local time reference frames. To establish a common time reference frame for the emitted signal detections, each receiver communication device exchanges time synchronization signals with a reference communication device. Since any of the receiver communication devices and the reference communication device may be mobile, the signal exchange allows each receiver communication device to accurately determine the signal propagation time between itself and the reference communication device and factor the signal propagation time into an accurate adjustment of the local time reference frame. Using trilateration, the position of the emitter is determined from known positions of the receiver communication devices and the emitted signal detection times from the receiver communication devices.

US Patent:

59093811, Jun 1, 1999

Filed:

Feb 19, 1997

Appl. No.:

8/802620

Inventors:

Pradipta Shome - Mountain Lakes NJ
Lawrence Doyle - Hazlet NJ

Assignee:

ITT Manufacturing Enterprises, Inc. - Wilmington DE

International Classification:

G06F 1700

US Classification:

364578

Abstract:

A system and a method is disclosed for on board prediction of a trajectory for satellites, which can be implemented on a computer with a limited number of bits. The system includes a compact force model that approximate the forces that the satellite encounters in an earth orbit. The compact force model includes a two body force component, a non-spherical earth gravitational force component, a solar radiation pressure component and a lunar-solar perturbation force component. An adder is coupled to the force model for combining the force components to produce an equation of motion approximating the acceleration of the satellite. An integrator is included for integrating the equation of motion approximating the acceleration of said satellite to produce an equation of motion approximating the displacement of the satellite, wherein the equation of motion approximating the displacement of the satellite is a reference trajectory.