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Counting the number of people is something many security application focuson, when dealing with controlling accesses in restricted areas, as it occurswith banks, airports, railway stations and governmental offices. This paperpresents an automated solution for detecting the presence of more than oneperson into interlocked doors adopted in many accesses. In most cases,interlocked doors are small areas where other pieces of information and sensorsare placed in order to detect the presence of guns, explosive, etc. The generalgoals and the required environmental condition, allowed us to implement adetection system at lower costs and complexity, with respect to other existingtechniques. The system consists of a fixed array of microwave transceivermodules, whose received signals are processed to collect information related toa sort of volume occupied in the interlocked door cabin. The proposed solutionhas been statistically validated by using statistical analysis. The wholesolution has been also implemented to be used in a real time environment andthus validated against real experimental measures.

Detection of Critical Number of People in Interlocked Doors for Security Access Control by Exploiting a Microwave Transceiver-Array