System and method for improving infrared detector performance in dual detector system
First Claim
1. A system for improving false alarm immunity for a dual intrusion detector, the dual intrusion detector including at least one microwave sensor and at least one passive infrared sensor, the system comprising:
- multiple range bins for classifying microwave signals, the multiple range bins comprising at least a long range bin and a mid range bin;
a range determination, module for estimating a target range based on a state of each of the multiple range bins; and
an infrared sensitivity determination mechanism for determining an optimal infrared sensor sensitivity level based on the estimated target range, wherein a target located within the long range bin and not within the mid range bin, and that transmits a signal having a frequency below a predetermined threshold, triggers an increase in infrared detector sensitivity level in order to detect slow moving intruders.
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Accused Products
Abstract
Embodiments of the present invention is directed to a method and system for use of ranging MW to reduce dual (MW/PIR) intrusion detector false alarms. A Doppler microwave system may be provided that is capable of detecting an object range and adjusting the sensitivity of the PIR detector to account for object size and 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 is determined. The sensitivity of the PIR is then adjusted based on a PIR sensitivity vs. object range function that is optimized to alarm on humans and ignore small animals and insects.
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Citations
30 Claims
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1. A system for improving false alarm immunity for a dual intrusion detector, the dual intrusion detector including at least one microwave sensor and at least one passive infrared sensor, the system comprising:
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multiple range bins for classifying microwave signals, the multiple range bins comprising at least a long range bin and a mid range bin; a range determination, module for estimating a target range based on a state of each of the multiple range bins; and an infrared sensitivity determination mechanism for determining an optimal infrared sensor sensitivity level based on the estimated target range, wherein a target located within the long range bin and not within the mid range bin, and that transmits a signal having a frequency below a predetermined threshold, triggers an increase in infrared detector sensitivity level in order to detect slow moving intruders. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for improving false alarm immunity for a dual intrusion detector, the dual intrusion detector including at least one microwave sensor and at least one passive infrared sensor, the system comprising:
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multiple range bins for classifying microwave signals, the multiple range bins including a long range bin, a mid range bin, a short range bin, and an insect range bin capable of detecting insects in an immediate vicinity of the intrusion detector; a range determination module for estimating a target range based on a state of each of the multiple range bins; and an infrared sensitivity determination mechanism for determining an optimal infrared sensor sensitivity level based on the estimated target range, wherein when the insect bin detects a target, the infrared sensitivity determination mechanism determines that the optimal infrared sensor sensitivity is a low sensitivity and an infrared alarm trigger requires high amplitude pulses. - View Dependent Claims (10, 11)
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12. A system for improving false alarm immunity for a dual intrusion detector, the dual intrusion detector including at least one microwave sensor and at least one passive infrared sensor, the system comprising:
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multiple range bins for classifying microwave signals, the multiple range bins including a long range bin, a mid range bin, a short range bin, and an insect range bin capable of detecting insects in an immediate vicinity of the intrusion detector; a range determination module for estimating a target range based on a state of each of the multiple range bins; and an infrared sensitivity determination mechanism for determining an optimal infrared sensor sensitivity level based on the estimated target range, wherein when the insect range bin detects a target, the infrared sensitivity determination mechanism triggers a time delay, beginning at insect range bin target detection, and terminating at a fixed time after clearance of the insect range bin, wherein infrared signals are ignored during the time delay. - View Dependent Claims (13)
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14. A method for minimizing false alarms due to small animals and insects in a coverage area of a dual detector system, the dual detector system including at least one microwave sensing system and at least one passive infrared sensing system, the method comprising:
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determining a target range for a detected target from received microwave signals by providing multiple range bins for the microwave sensing system including an insect range bin capable of detecting insects in an immediate vicinity of the intrusion detector; adjusting a passive infrared sensor threshold based on the determined target range, wherein the passive infrared sensor threshold is at a first level when the detected target is a short range target and second level when the target is a longer range target, such that the first level may be higher or lower than the second level depending on PIR sensitivity in a short range and a long range; and adjusting the passive infrared sensitivity to a low sensitivity when the insect range bin detects intrusion, such that an infrared alarm trigger requires high amplitude pulses. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method for minimizing false alarms due to small animals and insects in a coverage area of a dual detector system, the dual detector system including at least one microwave sensing system and at least one passive infrared sensing system, the method comprising:
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determining a target range for a detected target from received microwave signals by providing multiple range bins for the microwave sensing system including an insect range bin capable of detecting insects in an immediate vicinity of the intrusion detector and a short range bin for detection of crawling intruders under or in the near vicinity of the intrusion detector; adjusting a passive infrared sensor threshold based on the determined target range, wherein the passive infrared sensor threshold is at a first level when the detected target is a short range target and second level when the target is a longer range target, such that the first level may be higher or lower than the second level depending on PIR sensitivity in a short range and a long range; and triggering an increase in infrared sensitivity upon detection of a target within the short range bin and not within the insect range bin to facilitate detection of crawling intruders. - View Dependent Claims (21)
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22. A method for improving false alarm immunity for a dual intrusion detector, the dual intrusion detector including at least one microwave sensor and at least one passive infrared sensor, the method comprising:
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classifying a received microwave signal into a range bin; estimating a target range based on a range bin state comparison; determining an optimal passive infrared sensor sensitivity level based on the estimated target range; and providing an insect range bin capable of detecting insects in an immediate vicinity of the intrusion detector, and when the insect range bin detects a target, triggering a time delay, beginning at insect range bin target detection, and terminating at a fixed time after clearance of the insect range bin, wherein infrared signals are ignored during the time delay. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A method for improving false alarm immunity for a dual intrusion detector, the dual intrusion detector including at least one microwave sensor and at least one passive infrared sensor, the method comprising:
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classifying a received microwave signal into a range bin; estimating a target range based on a range bin state comparison; determining an optimal passive infrared sensor sensitivity level based on the estimated target range; and providing a long range bin and a mid range bin such that targets detected within the long range bin and not within the mid range bin, and transmitting a signal having a frequency below a predetermined threshold, trigger an increase in a passive infrared sensitivity level in order to detect slow moving intruders. - View Dependent Claims (29, 30)
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Specification