Microwave intrusion detecting system and apparatus

摘要: A digital microwave intrusion detecting system and apparatus is disclosed wherein a plurality of repeater/transponders with receiving transmitting antennas define perimeter in response to each interrogation pulse sent down the reply pulses are received back at monitoring location corresponding number last transponder send reply. The violation defined by an pulse. If certain replies, for example one, not from all transponders warning signal given if different replies back, as example, two succession, alarm that has been violated.