Synchronization system and method for achieving low power battery operation of a vehicle locating unit in a stolen vehicle recovery system which receives periodic transmissions
First Claim
1. A synchronization system for achieving low power battery operation of a vehicle locating unit in a stolen vehicle recovery system which receives transmissions from at least one transmission source, each of said transmissions having a transmission cycle period and providing an expected message to the synchronization system, the expected message having a transmission duration, comprising:
- a radio receiver for receiving said transmissions; and
a microprocessor configured to turn on said radio receiver for a limited time to detect the expected message;
if the expected message is not found, turning off said radio receiver and turning it on again after a time asynchronous with the transmission cycle period;
after finding the expected message, waiting for a length of time equal to the difference between the cycle period of the transmissions less the transmission duration length of the expected message and then looking for a synchronization symbol in the expected message and synchronizing subsequent actuation of said radio receiver using said synchronization symbol.
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Accused Products
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.
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Citations
14 Claims
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1. A synchronization system for achieving low power battery operation of a vehicle locating unit in a stolen vehicle recovery system which receives transmissions from at least one transmission source, each of said transmissions having a transmission cycle period and providing an expected message to the synchronization system, the expected message having a transmission duration, comprising:
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a radio receiver for receiving said transmissions; and a microprocessor configured to turn on said radio receiver for a limited time to detect the expected message;
if the expected message is not found, turning off said radio receiver and turning it on again after a time asynchronous with the transmission cycle period;
after finding the expected message, waiting for a length of time equal to the difference between the cycle period of the transmissions less the transmission duration length of the expected message and then looking for a synchronization symbol in the expected message and synchronizing subsequent actuation of said radio receiver using said synchronization symbol. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A synchronization method for achieving low power battery operation of a vehicle locating unit in a stolen vehicle recovery system whose radio receiver receives from at least one transmission source, each of said transmissions having a transmission cycle period and providing an expected message to the synchronization system, the expected message having a transmission duration, comprising:
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receiving said transmissions; turning on a radio receiver for a limited time to detect the expected message;
if the expected message is not found, turning off said radio receiver and turning it on again after a time asynchronous with said transmission cycle period; andafter finding the expected message, waiting for a length of time equal to the difference between the cycle period of the transmissions less the transmission duration of the expected message and then looking for a synchronization symbol in the expected message and synchronizing subsequent actuation of said radio receiver using said synchronization symbol. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification