Patent ID: 9589465
Date: 2017-03-07
CPC Classifications: G01S,G01V,G06Q,G08G,H04W

Claim:
1. A vehicle presence detection system, comprising: a plurality of transmitters, wherein each of the plurality of transmitters is associated with a parking space in a group of parking spaces to monitor, wherein the plurality of transmitters are each attached to a parking space in the group of parking spaces so that when a vehicle is parked in the parking space the vehicle substantially covers a transmitter for the parking space; a main receiver configured to receiving a radio wave signal from each of the plurality of transmitters, wherein the main receiver is positioned above the plurality of transmitters, wherein the main receiver is positioned in a central portion of the plurality of transmitters; and a control unit in communication with the main receiver, wherein the control unit determines a signal strength of the radio wave signal received by the main receiver, wherein the control unit determines that a vehicle is near a selected transmitter of the plurality of transmitters when the signal strength of the radio wave signal for the selected transmitter is reduced by a threshold loss.