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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

  • US 9,480,037 B2
  • Filed: 08/17/2015
  • Issued: 10/25/2016
  • Est. Priority Date: 10/23/2009
  • Status: Active Grant
First Claim
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1. A device for synchronizing a vehicle locating unit in a stolen vehicle recovery system with an assigned message frame in a phased transmission from any of a plurality of phased transmission sources, each of the plurality of phased transmission sources configured for emitting a corresponding phased transmission during a discrete period of a transmission cycle for the plurality of phased transmission sources, the device comprising:

  • a receiver for receiving, during periods of actuation, at least a portion of phased transmissions from the plurality of phased transmission sources; and

    a microprocessor configured to execute computer-readable instructions to;

    a. activate the receiver for a period of actuation;

    b. de-activate the receiver for a delay period of time asynchronous with the transmission cycle of the plurality of phased transmission sources if a transmission is not received; and

    c. repeat (a) and (b), untild. receive phased transmissions from the plurality of phased transmission sources emitting a transmission signal during the transmission cycle;

    e. identify a transmission source having a strongest signal by comparing, by the microprocessor, a strength of signal for each of the received phased transmissions;

    f. for the identified transmission source with the strongest signal, compare, during the corresponding discrete period of the transmission cycle, by the microprocessor, at least a portion of each received phased transmission to a plurality of expected stored commands; and

    g. synchronize activation and de-activation of the receiver with a timing offset associated with one of the expected stored commands.

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