Motorola Corporation

Julio A Sanchez

Charles Burton Swope

Daniel A Tealdi

Jason A Rapps

A location determination system () utilizes a low accuracy timing infrastructure () to synchronize a personal tracking device () having high accuracy timing location determination devices integrated therein. The PTD () includes a radio frequency (RF) location unit () and integrated sensors, such as altimeter (), GPS receiver () and inertial navigation unit (IMU) (). The RF location unit () receives a synchronization command from the low accuracy timing infrastructure () and provides timing data representing range information in response thereto. The range information is used by the high accuracy timing infrastructure () to compute updated X, Y, Z coordinates of the PTD ().

Location determination system and method therefor

A wireless communication system () employs a method () and apparatus for automatically tracking locations of wireless communication devices () in a geographic area, such as an ad hoc area of an emergency scene, that is divided into two or more zones (). A wireless communication device () or a host device (), determines a location of the wireless device (). The wireless device's location is then associated with one of the zones (). An indication () of a zone change is presented to a user of the wireless device and/or the host device (), as applicable, in the event that the wireless device's location reflects a transition of the device from one zone to another. Alternatively, each wireless device () might be associated with a corresponding group, such as a fire department, and the zone change indication might include an identifier () of the wireless device's group.

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Coral Springs, FL, United States of America

Julio A Sanchez