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

摘要

Method and apparatus receiving reports from at least two wireless vehicular sensor nodes and stepping through a process of comparing filtered queues to determine the first and the second waveform in time, leading to counting the vehicles passing the magnetic sensors of the wireless vehicular sensor nodes.

主权项

1. A method comprising the step of counting the passing of vehicles between a first and a second wireless vehicular sensor nodes by
operating 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, and said 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.