Inventors:
Daraius Hathiram - Austin TX
Bruce Cummings - Austin TX
Nicholas Anderson - Austin TX
Ronald E. Ham - Austin TX
James Chaput - Austin TX
Assignee:
Bluespan, L.L.C. - Pflugerville TX
International Classification:
G01C 2100
Abstract:
A method, computer program product and system for monitoring and locating an object using secure communications without relying on GPS. A monitoring device may activate a monitored unit (unit monitored by monitoring device) by transmitting a seed of an algorithm and a time synchronization to the monitored unit. The seed and time synchronization may be used in conjunction with an algorithm, e. g. , frequency hopping table, stored in both the monitoring device and the monitored unit, to allow both the monitoring device and the monitored unit to communicate with one another at a uniquely synchronized time and frequency thereby making it more difficult for a third party to locate the monitored unit. An alert may be generated when the monitored unit is located beyond a predetermined zone. The monitored unit may be located by activating a directional antenna in conjunction with a digital compass on the monitoring device.