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Method and apparatus for counting the bidirectional passage of vehicles in a wireless vehicular sensor network

  • US 9,177,469 B2
  • Filed: 12/20/2006
  • Issued: 11/03/2015
  • Est. Priority Date: 12/22/2005
  • Status: Active Grant
First Claim
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1. A method comprising the step of counting the passing of vehicles between a first and a second wireless vehicular sensor nodes byoperating an apparatus that interacts with a first filtered queue and a second filtered queue,with said first filtered queue created in response to a report based upon a magnetic sensor from said first wireless vehicular sensor node,with said second filtered queue created in response to a second report based upon a second of said magnetic sensor from said second wireless vehicular sensor node, andsaid apparatus distinct from said first wireless vehicular sensor node and from said second wireless vehicular sensor node;

  • wherein the step of counting, comprises said apparatus performing the steps of;

    first determining (3300A) if either of said filtered queues are empty;

    filling and filtering (3000) out short spikes less than a holdover interval of not more than 300 milliseconds (ms) in said waveform queues by using said reports received from said wireless vehicular sensor nodes;

    finding (3100) a first rising edge in said filtered queues and designates said filtered queue as a first waveform;

    second determining (3200) whether a second waveform rises before said first waveform falls;

    third determining (3400) whether said second waveform falls before said first waveform falls;

    causing (2500) a count;

    fourth determining (3300B) if either of said filtered queues are empty;

    first pushing (3500) only a last pulse back on each waveform queue;

    fifth determining (3600) whether said second waveform starts within a first time T1 of said first waveform falling;

    second pushing (3800) a most recent pulse back onto said second waveform queue; and

    sixth determining (3700) whether said second waveform falls after the next rise of said first waveform.

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