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Use of mutter mode in asset tracking for gathering data from cargo sensors

  • US 5,686,888 A
  • Filed: 06/07/1995
  • Issued: 11/11/1997
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
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1. A method of tracking and gathering data from cargo sensors comprising the steps of:

  • affixing a tracking unit to each respective container of cargo to be tracked;

    situating an environmental sensor in proximity to goods in at least some of the containers to which tracking units are affixed, each of the sensors transmitting an environmental condition sensed at periodic intervals;

    monitoring, at each tracking unit for a first predetermined period of time, transmissions from a specific one of said environmental sensors situated in proximity to the goods in a specific container to which said each tracking unit is affixed;

    logging, at said each tracking unit, times of reception of transmissions from said environmental sensors;

    thereafter, monitoring, at said each tracking unit for a second predetermined period of time centered on logged times, transmissions from the specific one of said environmental sensors; and

    recording, at said each tracking unit, data transmitted by the specific one of said environmental sensors.

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