In order to improve networked and automatic level of perimeter intrusion detection and cover dead area of monitoring of traditional intrusion detection effectively

WSNs technology in perimeter intrusion alarm a kind of infrared-ultrasonic wave joint perimeter intrusion alarming node and software is designed.The node uses method of combination of pyroelectric infrared and ultrasonic wave sensors to comprise frontier detective module

and realize wireless communication and digital processing unit based on GAINz.Through test in laboratory

sensors nodes can realize perimeter intrusion alarm successfully

eliminate errors effectively

and solve problem of false and missing alarm caused by own defect of single sensor.