Patent ID: 7760088
Filing Date: 2010-07-20
Classification: G01S,G01V,G08B

Abstract:
1. An intrusion detection sensor comprising: a microwave sensor that transmits microwaves toward a detection area, receives the microwaves reflected by an object present in the detection area, and outputs a reflected wave reception intensity signal according to the received intensity; a direction variable antenna device that can change the direction of the microwaves transmitted/received from/by the microwave sensor within a predetermined range of angle; a scanning measurement means that provides, to the direction variable antenna device, an instruction to scan the predetermined range of angle of the transmission/reception direction so as to determine a relationship between the transmission/reception direction and the output of the reflected wave reception intensity signal; a detection target object presence determination means that determines whether or not a detection target object is present based on the relationship between the transmission/reception direction and the output of the reflected wave reception intensity signal determined by the scanning measurement means; and an alarm signal output control means that performs control so that an alarm signal is outputted when the detection target object presence determination means determines that a detection target object is present wherein the reflected wave reception intensity signal is a voltage signal having a positive correlation with the received intensity, and the detection target object presence determination means determines obtained by integrating the electrical power value of the reflected wave reception intensity signal over the predetermined range of angle is not less than a predetermined ratio.