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US 6,191,688 B1Granted
Power-on mask detection method for motion detectors
AssigneeHoneywell International Inc.
InventorWilliam T. Sprouse
Life of this patent
Estimating the term…
Abstract
A method for determining if a motion detector is in a masked condition at the time power is applied to the detector. When power is first applied to the motion detector it enters a mask detection state which runs concurrently with activity and alarm detection routines. Any infrared motion that is detected after the detector has warmed up and stabilized will terminate the mask detection state. If a predetermined amount of microwave Doppler sensor activity is detected within the field of view without detection of infrared activity, a mask condition is declared.
Claims31
A power-on mask detection method for a motion detector having an infrared sensor and a microwave Doppler sensor, comprising the steps of:
- (a) initiating a mask detection process upon detecting that power has been applied to said motion detector;
- (b) terminating said mask detection process upon detection of a sensed infrared signal;
- (c) initiating a mask detection timing window if detected microwave signals exceed a threshold prior to detection of an infrared signal;
- and
- (d) declaring a mask condition if an infrared signal is not detected during said mask detection timing window.
2 more elements
A power-on mask detection method for a motion detector having an infrared sensor and a microwave Doppler sensor, comprising the steps of:
- (a) initiating a mask detection process upon detecting that power has been applied to said motion detector;
- (b) monitoring signals from said infrared sensor;
- (c) terminating said mask detection process if an infrared signal is detected;
- (d) monitoring signals from said microwave Doppler sensor;
- (e) initiating a mask detection timing window if microwave signals are detected at a level exceeding a threshold prior to detection of an infrared signal;
- and
- (f) declaring a mask condition if an infrared signal is not detected during said mask detection timing window.
4 more elements
A power-on method for detecting masking in a motion detector having an infrared sensor and a microwave Doppler sensor, comprising the steps of:
- (a) detecting a power-on reset signal generated from said motion detector;
- (b) monitoring signals from said infrared sensor and said microwave Doppler sensor upon detection of said power-on reset signal;
- (c) initiating a mask detection timing window if microwave sensor activity above a threshold is detected prior to detection of an infrared signal;
- (d) declaring a mask condition if an infrared signal is not detected within said mask detection timing window;
- and
- (e) resuming normal operation upon detection of a sensed infrared signal.
3 more elements
A power-on method for detecting masking in a motion detector having an infrared sensor and a microwave Doppler sensor, comprising the steps of:
- (a) detecting a power-on reset signal generated from said motion detector;
- (b) monitoring signals from said infrared sensor and said microwave Doppler sensor upon detection of said power-on reset signal;
- (c) resuming normal operation upon detection of an infrared signal;
- (d) initiating a mask detection timing window if microwave signals above a threshold are detected prior to detection of an infrared signal;
- (e) declaring a mask condition if an infrared signal is not detected within said mask detection timing window;
- and
- (f) resuming normal operation upon detection of a sensed infrared signal within said mask detection timing window.
4 more elements
A power-on method for detecting masking in a motion detector having an infrared sensor and a microwave Doppler sensor, comprising the steps of:
- (a) detecting a power-on reset signal generated from said motion detector;
- (b) monitoring signals from said infrared sensor and said microwave Doppler sensor upon detection of said power-on reset signal;
- (c) resuming normal operation upon detection of an infrared signal;
- (d) initiating a mask detection timing window having a duration of approximately fifteen seconds if, prior to detection of an infrared signal, approximately eight events are detected by said microwave Doppler sensor within a moving time window having a duration of approximately three seconds;
- (e) declaring a mask condition if an infrared signal is not detected within said mask detection timing window;
- and
- (f) resuming normal operation upon detection of a sensed infrared signal within said mask detection timing window.
4 more elements
A mask detecting motion detector, comprising:
- (a) an infrared sensor;
- (b) a microwave Doppler sensor;
- (c) a microcontroller operatively coupled to said infrared and microwave Doppler sensors;
- and
- (d) programming associated with said programmable data processor for carrying out the operations of:
- (i) initiating a mask detection process upon detecting that power has been applied to said motion detector;
- (ii) terminating said mask detection process upon detection of a sensed infrared signal;
- (iii) initiating a mask detection timing window if detected microwave signals exceed a threshold prior to detection of an infrared signal;
- and
- (iv) declaring a mask condition if an infrared signal is not detected during said mask detection timing window.
7 more elements
A mask detecting motion detector, comprising:
- (a) an infrared sensor;
- (b) a microwave Doppler sensor;
- (c) a microcontroller operatively coupled to said infrared and microwave Doppler sensors;
- and
- (d) programming associated with said microcontroller for carrying out the operations of:
- (i) initiating a mask detection process upon detecting that power has been applied to said motion detector;
- (ii) monitoring signals from said infrared sensor;
- (iii) terminating said mask detection process if an infrared signal is detected;
- (iv) monitoring signals from said microwave Doppler sensor;
- (v) initiating a mask detection timing window if microwave signals are detected at a level exceeding a threshold prior to detection of an infrared signal;
- and
- (vi) declaring a mask condition if an infrared signal is not detected during said mask detection timing window.
9 more elements
A mask detecting motion detector, comprising:
- (a) an infrared sensor;
- (b) a microwave Doppler sensor;
- (c) a microcontroller operatively coupled to said infrared and microwave Doppler sensors;
- and
- (d) programming associated with said microcontroller for carrying out the operations of:
- (i) detecting a power-on reset signal generated from said motion detector;
- (ii) monitoring signals from said infrared sensor and said microwave Doppler sensor upon detection of said power-on reset signal;
- (iii) initiating a mask detection timing window if microwave signals above a threshold are detected prior to detection of an infrared signal;
- (iv) declaring a mask condition if an infrared signal is not detected within said mask detection timing window;
- and
- (v) resuming normal operation upon detection of a sensed infrared signal.
8 more elements
A mask detecting motion detector, comprising:
- (a) an infrared sensor;
- (b) a microwave Doppler sensor;
- (c) a microcontroller operatively coupled to said infrared and microwave Doppler sensors;
- and
- (d) programming associated with said microcontroller for carrying out the operations of:
- (i) detecting a power-on reset signal generated from said motion detector;
- (ii) monitoring signals from said infrared sensor and said microwave Doppler sensor upon detection of said power-on reset signal;
- (iii) resuming normal operation upon detection of an infrared signal;
- (iv) initiating a mask detection timing window if microwave signals above a threshold are detected prior to detection of an infrared signal;
- (v) declaring a mask condition if an infrared signal is not detected within said mask detection timing window;
- and
- (vi) resuming normal operation upon detection of a sensed infrared signal within said mask detection timing window.
9 more elements
A mask detecting motion detector, comprising:
- (a) an infrared sensor;
- (b) a microwave Doppler sensor;
- (c) a microcontroller operatively coupled to said infrared and microwave Doppler sensors;
- and
- (d) programming associated with said microcontroller for carrying out the operations of:
- (i) detecting a power-on reset signal generated from said motion detector;
- (ii) monitoring signals from said infrared sensor and said microwave Doppler sensor upon detection of said power-on reset signal;
- (iii) resuming normal operation upon detection of an infrared signal;
- (iv) initiating a mask detection timing window having a duration of approximately fifteen seconds if, prior to detection of an infrared signal, approximately eight events are detected by said microwave Doppler sensor within a moving time window having a duration of approximately three seconds;
- (v) declaring a mask condition if an infrared signal is not detected within said mask detection timing window;
- and
- (vi) resuming normal operation upon detection of a sensed infrared signal within said mask detection timing window.
9 more elements
Dependencies are inferred from the claim text.