Patent ID: 9112674
Filing Date: 2015-08-18
Classification: H04L,H04W,Y02D

Abstract:
1. A system for maintaining synchronization with a periodic transmission from one of a plurality of transmission sources while achieving low power battery operation of a vehicle locating unit in a stolen vehicle recovery system, the periodic transmission occurring during a transmission cycle period and including an expected message that has a transmission duration, the system comprising: a selectively-actuatable radio receiver for receiving during periods of actuation the periodic transmissions from the one of a plurality of transmission sources; and a microprocessor configured to look for a synchronization symbol in the expected message and to synchronize subsequent actuation of the radio receiver using the synchronization symbol; to reacquire a warm start synchronization if synchronization is lost; and to acquire a cold start synchronization if the warm start synchronization fails to reacquire synchronization.