Use of a multi-frequency relay of ultrasonic sensors with PIR sensors to extend the sensing range of an embedded surveillance system

In this paper we design and implement an embedded surveillance system by use of a multi-frequency relay of ultrasonic sensors with multiple pyroelectric infrared sensors (PIR) to extend the sensing range in a home or a storehouse. The ultrasonic sensor module consists of a transmitter and a receiver which are placed in a line direction; however, ultrasonic sensors with the same frequency are disturbed by crosstalk with each other and have a high miss rate. To overcome these disadvantages of the ultrasonic sensor, both ultrasonic sensors and PIR sensors are managed by the majority voting mechanism (MVM).