1
Robert W Levi, Thomas Judd: Dead reckoning navigational system using accelerometer to measure foot impacts. Point Research Corporation, Price Gess & Ubell, December 10, 1996: US05583776 (334 worldwide citation)

A microcomputer-assisted position finding system that integrates GPS data, dead reckoning sensors, and digital maps into a low-cost, self-contained navigation instrument is disclosed. A built-in radio frequency transponder allows individual positions to be monitored by a central coordinating facilit ...


2
Robert W Levi, Robert R Marshall: Navigation device for personnel on foot. Point Research Corporation, November 2, 2004: US06813582 (200 worldwide citation)

Performing dead reckoning navigation for persons on foot with improved accuracy. Accelerometers in a navigation device are used to deduce when abnormal steps are being taken and modify navigation calculations accordingly. Running and walking sideways or backwards are among the situations which can b ...


3
Robert W Levi, Robert R Marshall: Gyro aided magnetic compass. January 18, 2005: US06842991 (107 worldwide citation)

An improved method, system, and device for a compass combining an electronic magnetic compass and an angular velocity sensing gyroscope. One aspect of the invention integrates an angular velocity output signal from an angular velocity sensor or rate gyroscope to determine the angle of motion. An ini ...


4
Robert W Levi, Toan X Vu: Barometric floor level indicator. Honeywell International, January 9, 2007: US07162368 (105 worldwide citation)

The invention relates to a device, system, and method for providing a multi-mode navigation device. In a first mode of operation, the navigation device provides position information based on a radio frequency navigation signals. If radio signals become unavailable, the navigation device enters a sec ...


5
Robert W Levi, Charles T Judd, Steven J Davis: Multi-mode navigation device and method. Honeywell International, Sheldon & Mak PC, September 5, 2006: US07103471 (36 worldwide citation)

A method and apparatus for providing dead reckoning position data, orientation, and heading of a person is disclosed. The apparatus uses an algorithm that automatically determines the appropriate set of navigation functions for personal navigation based upon the orientation of the apparatus. Dead re ...


6
Robert W Levi, Ron Fang: Compact navigation device assembly. Honeywell International, Julio M Loza, Sheldon & Mak, February 28, 2006: US07005584 (1 worldwide citation)

One embodiment of the invention provides a compact navigation device assembly that is rugged, compact and does not require independent connector components to interconnect multiple circuit boards. According to one implementation of the compact navigation device assembly, an electrical or electromech ...


7
Robert W Levi, Robert R Marshall: Gyro aided magnetic compass. Snell & Wilmer, February 5, 2004: US20040020064-A1 (1 worldwide citation)

An improved method, system, and device for a compass combining an electronic magnetic compass and an angular velocity sensing gyroscope. One aspect of the invention integrates an angular velocity output signal from an angular velocity sensor or rate gyroscope to determine the angle of motion. An ini ...


8
Robert W Levi, Charles T Judd, Steven J Davis: Multi-mode navigation device and method. Julio M Loza Esq, Snell & Wilmer, March 25, 2004: US20040059502-A1

A method and apparatus for providing dead reckoning position data, orientation, and heading of a person is disclosed. The apparatus uses an algorithm that automatically determines the appropriate set of navigation functions for personal navigation based upon the orientation of the apparatus. Dead re ...


9
Robert W Levi, Robert R Marshall: Navigation device for personnel on foot. Snell & Wilmer, April 1, 2004: US20040064286-A1

Performing dead reckoning navigation for persons on foot with improved accuracy. Accelerometers in a navigation device are used to deduce when abnormal steps are being taken and modify navigation calculations accordingly. Running and walking sideways or backwards are among the situations which can b ...


10
Robert W Levi, Ron Fang: Compact navigation device assembly. Julio M Lozs Esq, Sheldon & Mak, August 18, 2005: US20050180120-A1

One embodiment of the invention provides a compact navigation device assembly that is rugged, compact and does not require independent connector components to interconnect multiple circuit boards. According to one implementation of the compact navigation device assembly, an electrical or electromech ...