Abstract: For one setting operator being able to readily adjust a threshold by oneself, by means of reporting units that issue a report to indicate the amount of variation in a received electric wave when an intruding object has intruded between a transmitting leaking transmission path and a receiving leaking transmission path, and a remote controller that generates a signal which changes a threshold in the table through the receiving leaking transmission path, the threshold is adjusted properly for each of the blocks with the remote controller based on the report issued from the reporting unit to indicate the amount of variation in the received electric wave caused by a trial intrusion between the two transmission paths by a threshold setting operator.

Abstract: For one setting operator being able to readily adjust a threshold by oneself, by means of reporting units that issue a report to indicate the amount of variation in a received electric wave when an intruding object has intruded between a transmitting leaking transmission path and a receiving leaking transmission path, and a remote controller that generates a signal which changes a threshold in the table through the receiving leaking transmission path, the threshold is adjusted properly for each of the blocks with the remote controller based on the report issued from the reporting unit to indicate the amount of variation in the received electric wave caused by a trial intrusion between the two transmission paths by a threshold setting operator.

Abstract: An intruder detection system is provided in which a detection range can be set to a predetermined one so that false detection caused by a moving object outside the predetermined range can be diminished. The system includes a transmission-side leaky transmission line that radiates a detection signal for detecting an intruder and a reception-side leaky transmission line that receives a detection signal leaked from the transmission-side leaky transmission line, both of which are buried spaced apart from each other in a detection surveillance area, and detects the presence/absence of an intruder in the detection surveillance area based on variations in the detection signal received by the reception-side leaky transmission line, wherein at least part of either the transmission-side leaky transmission line or the reception-side leaky transmission line is made of a surface-wave-type leaky coaxial transmission line, and the other leaky transmission line, a radiation-type leaky coaxial transmission line.

Abstract: An intruder detection system is provided in which a detection range can be set to a predetermined one so that false detection caused by a moving object outside the predetermined range can be diminished. The system includes a transmission-side leaky transmission line that radiates a detection signal for detecting an intruder and a reception-side leaky transmission line that receives a detection signal leaked from the transmission-side leaky transmission line, both of which are buried spaced apart from each other in a detection surveillance area, and detects the presence/absence of an intruder in the detection surveillance area based on variations in the detection signal received by the reception-side leaky transmission line, wherein at least part of either the transmission-side leaky transmission line or the reception-side leaky transmission line is made of a surface-wave-type leaky coaxial transmission line, and the other leaky transmission line, a radiation-type leaky coaxial transmission line.