System and method for implementing ranging microwave for detector range reduction
First Claim
1. A system for making a range reduction determination within a dual intrusion detector, the dual intrusion detector including at least one microwave sensor having a microwave coverage range and at least one passive infrared sensor having a passive infrared coverage range, the system comprising:
- multiple range bins for classifying microwave signals;
a range/size determination module for estimating a target range and size for a detected target based on a state of each of the multiple range bins; and
a range reduction component for determining whether at least one passive infrared sensor within the dual intrusion detector has a passive infrared coverage range which has been reduced by 50% or greater due to a blockage.
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Accused Products
Abstract
Embodiments of the present invention are directed to a method and system for use of ranging MW to detect range reduction in a dual (MW/PIR) intrusion detector. Embodiments of the invention utilize a Doppler microwave system capable of detecting an object range. Multiple range limited MW stages may be configured for different ranges to determine the general range of the moving object. Based on signal levels present on these MW stages, an approximate object range and size is determined. Embodiments of the invention recognize cases of PIR range reduction by use of range limited MW stages configured for different ranges to determine the general range of the moving object. If the MW recognizes a moving object of sufficient size within the coverage area, and if no PIR signal is present, the PIR is recognized as being blocked or disabled and notification is provided.
35 Citations
33 Claims
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1. A system for making a range reduction determination within a dual intrusion detector, the dual intrusion detector including at least one microwave sensor having a microwave coverage range and at least one passive infrared sensor having a passive infrared coverage range, the system comprising:
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multiple range bins for classifying microwave signals; a range/size determination module for estimating a target range and size for a detected target based on a state of each of the multiple range bins; and a range reduction component for determining whether at least one passive infrared sensor within the dual intrusion detector has a passive infrared coverage range which has been reduced by 50% or greater due to a blockage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 29)
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11. A method for making a range reduction determination within a dual detector system, the dual detector system including at least one microwave sensor having a microwave coverage area and at least one passive infrared sensor having a passive infrared coverage area, the method comprising:
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detecting a microwave signal from a target within the microwave coverage area in the absence of a passive infrared signal; providing multiple range bins comprising at least a short range bin, a mid-range bin, and a long range bin for determining a target range and size; determining a target range and size for a detected target from the received microwave signal; and comparing the target range to the passive infrared coverage range to identify a reduced passive infrared coverage range if the target range indicates that the target is located beyond the short range bin and is of sufficient size, and if the at least one passive infrared sensor fails to receive a passive infrared signal from the target. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 30, 31)
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19. A method for making a range reduction determination for a dual intrusion detector, the dual intrusion detector including at least one microwave sensor having a microwave coverage range and at least one passive infrared sensor having a passive infrared coverage range, the method comprising:
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classifying a received microwave signal into a range bin; estimating a target range and size for a target based on a range bin state comparison; and making a range reduction determination for the passive infrared sensor by; determining whether or not a passive infrared signal is received by the at least one passive infrared sensor; determining whether a target is located in the passive infrared coverage range and has a sufficient size to be detected by the at least one passive infrared sensor based on the estimating step; and determining that the at least one passive infrared sensor is blocked if a target of sufficient size is located in the passive infrared coverage range and if the at least one passive infrared sensor does not receive an infrared signal from the target. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 32, 33)
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Specification