Many parking areas are equipped with sensors that detect whether a specific parking space is occupied. However, allocating a sensor for each parking space has high cost and is thus not scalable. This disclosure describes techniques to determine net parking space availability in a parking area by placing two sensors in line one after the other to act as a directional tripwire at each entrance and exit. The two sensors act as a directional tripwire. The temporal ordering of the signal peaks registered at the two sensors indicate the direction of travel of a vehicle. The total occupancy of the parking area can be derived from the running tally of vehicle entries and exits triggered by the sensor readings. A sequence model capable of modeling variable time intervals is employed to accommodate vehicles moving past the sensors at different speeds. The techniques enable determination of net occupancy of the parking area with fewer sensors. The number of sensors scales with the number of entry and exit points. The lower number of sensors can reduce analytics resolution but have lower installation and maintenance costs, and high scalability.
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Shin, D, "Measuring Net Occupancy of a Parking Area with a Sensor Pair at Each Entry and Exit", Technical Disclosure Commons, (March 24, 2023)