For the problem of low positioning accuracy,high false and missed alarm rate of traditional perimeter intrusion detection systems,a new type of perimeter intrusion detection system was designed based on leaky coaxial cables.According to the functional requirements of the intrusion detection system,two specially designed leaky cables were buried underground,forming an invisible protective zone by its electromagnetic field,while the signals propagating in the leaky cables were sent and processed by a field-programmable gate array.Finally,a self-developed test software was applied to achieve the remote automatic detection process.The experimental results show that the intrusion detection system based on leaky cables has achieved the positioning accuracy of 5 m.In addition,it has the advantages of fully hidden installation,accurate intrusion locating capability and low false and missed alarm rate.