Patent ID: 8624734

Claim:
An intruder identifying method for detecting intrusion of an intruder by using an intruder identifying device comprising an electric wave transmitting unit including a leakage coaxial cable which is laid along the outer edge of an intrusion preventing area and emits electric waves, an electric wave receiving unit including a leakage coaxial cable which is laid along the outer edge of the intrusion preventing area, which receives the electric waves emitted from the electric wave transmitting unit and outputs a reception signal, and an intruder identifying sensor device for determining intrusion or non-intrusion of an intruder into the intrusion preventing area and an intrusion position on the basis of the reception signal output from the electric wave receiving unit, wherein the intruder identifying sensor device identifies an intruder, as a detection target, by determining: whether a variation style, for a predetermined time, of intruder intrusion state information based on the reception signal of the electric wave receiving unit during a time period, from the time when the intruder identifying sensor device detects the intruder, until the time when the intruder identifying sensor device does not detect the intruder, is a predetermined variation style that corresponds to a predetermined shape, and wherein the intruder intrusion state information is information on a composite vector, and the variation style is a vector locus style of the composite vector when the composite vector varies.