Inventors:
Fabio Meacci - Cambridge MA, US
Michael Goodwin - North Andover MA, US
James A. Justice - Medfield MA, US
Jesse L. Rhodes - Franklin MA, US
Assignee:
LoJack Corporation - Canton MA
International Classification:
H04B 1/16
US Classification:
4553432, 4553431, 455574, 455231, 4554041, 4554042, 455410, 370311, 340 732, 340 733, 340 735
Abstract:
Synchronization for achieving low power battery operation of a vehicle locating unit in a stolen vehicle recovery system whose radio receiver receives periodic transmissions, includes receiving periodic transmissions; turning on a radio receiver for a limited time to detect an expected message; if an expected message is not found, turning off the receiver and turning it on again after a time asynchronous with the transmission period; and after finding an expected message, waiting for the period of the transmissions less the length of an expected message and then looking for a synchronization symbol in the expected message and synchronizing subsequent actuation of the receiver using that synchronization symbol.