Occupancy sensors in carpark based on wireless network

To provide accurate, real time carpark space information, a novel berth detector system which is based on the vortex detection principle, and using wireless technology is designed for the parking guidance system. The berth-detecting algorithm is proposed according to the complicated practical carpark situation via threshold method. The median filter technology is adopted in this algorithm to eliminate transient-upset signal. The wireless module is both used in each detector and the center of the data management to build an data-transferring road. The results show that the vortex berth detector has strong robustness under rapid time-varying temperature condition, and the algorithm is efficient and reliable.