Automatically adjustable and self-testing dual technology intrusion detection system for minimizing false alarms

Claim 2

An intrusion detection system which comprises: dual sensing means for monitoring motion within a predetermined volume of space, said dual sensing means having a first sensor for detecting motion within said volume of space and a second sensor for verifying said motion detected by said first sensor so as to activate an alarm; and processing means interactive with said dual sensing means, such that said processing means increases the stability of said second sensor when said first sensor detects motion for a first predetermined period of time without verification by said second sensor, said stability defining when said second sensor activates said alarm.

Claim 3

The system according to claim 1, wherein one of said first and second sensors is an active sensor and the other sensor is a passive sensor.

Claim 4

The system according to claim 1, wherein said processing means modifies the sensitivity of said first sensor when said first sensor detects a predetermined number of disturbances.

Claim 5

The system according to claim 3, wherein said processing means modifies the sensitivity of said first sensor a number of times until said first sensor is in a predetermined maximum stability mode.

Claim 6

An intrusion detection system which comprises: first detecting means for monitoring motion within a predetermined volume of space and for generating a first detect signal in response to detection of motion in said predetermined volume of space; second detecting means for generating a second detect signal in response to detection of said motion in said predetermined volume of space; and processing means for receiving said first and second detect signals, for activating said second detecting means in response to first detect signal, for modifying the number of said second detect signals required to activate an alarm when said first detecting means detects motion for a predetermined period of time without verification by said second detecting means and for activating said alarm when said modified number of said second detect signal is received by said processing means.

Claim 7

An intrusion detection system which comprises: first detecting means for monitoring motion within a predetermined volume of space and for generating a first detect signal in response to detection of motion in said predetermined volume of space; second detecting means for generating a second detect signal in response to detection of said motion in said predetermined volume of space; and processing means for receiving said first and second detect signals, for activating said second detecting means in response to first detect signal, for modifying the number of said second detect signals required to activate an alarm when said first detecting means detects motion for a predetermined period of time without verification by said second detecting means and for activating said alarm when said modified number of said second detect signal is received by said processing means.

Claim 8

The system according to claim 5, further comprising means for multiplexing said first and second detect signals such that said processing means selectively receives said first detect signal and said second detect signal.

Claim 9

The system according to claim 5, wherein said processing means modifies the number of said second detect signals by increasing a pulse count and a timing window associated with said second detect signal.

Claim 10

The system according to claim 7, wherein said pulse count and said timing window are modified between a normal detection mode and a high stability detection mode.

Claim 11

The system according to claim 8, wherein said normal detection mode comprises a pulse count of two pulses and a timing window of five seconds.

Claim 12

The system according to claim 8, wherein said high stability detection mode comprises a pulse count of four pulses and a timing window of ten seconds.

Claim 13

The system according to claim 8, further comprising means for self-testing said first detecting means and said second detecting means.

Claim 14

An intrusion detection system which comprises: microwave detecting means for monitoring motion within a predetermined volume of space and for generating a first detect signal in response to detection of motion in said predetermined volume of space; PIR detecting means for generating a second detect signal in response to detection of said motion in said predetermined volume of space; and processing means for receiving said first and second detect signals, for activating said PIR detecting means in response to said first detect signal, for modifying the number of said second detect signals required to activate an alarm when said microwave detecting means detects motion and said PIR detecting means fails to detect motion for a first predetermined period of time, and for activating said alarm when said modified number of said second detect signal is received by said processing means.

Claim 15

An intrusion detection system which comprises: microwave detecting means for monitoring motion within a predetermined volume of space and for generating a first detect signal in response to detection of motion in said predetermined volume of space; PIR detecting means for generating a second detect signal in response to detection of said motion in said predetermined volume of space; and processing means for receiving said first and second detect signals, for activating said PIR detecting means in response to said first detect signal, for modifying the number of said second detect signals required to activate an alarm when said microwave detecting means detects motion and said PIR detecting means fails to detect motion for a first predetermined period of time, and for activating said alarm when said modified number of said second detect signal is received by said processing means.

Claim 16

The system according to claim 12, further comprising means for multiplexing said first and second detect signals such that said processing means selectively receives said first detect signal or said second detect signal.

Claim 17

The system according to claim 12, wherein said processing means modifies the number of said second detect signals by increasing a PIR pulse count and a PIR timing window.

Claim 18

The system according to claim 14, wherein said PIR pulse count and PIR timing window are modified between a normal detection mode and a high stability detection mode.

Claim 19

The system according to claim 15, wherein said normal detection mode comprises a PIR pulse count of two pulses and PIR timing window of five seconds.

Claim 20

The system according to claim 15, wherein said high stability detection mode comprises a PIR pulse count of four pulses and a PIR timing window of ten seconds.

Claim 21

The system according to claim 14, wherein modifying the number of said second detect signals comprises decreasing said PIR pulse count and said PIR timing window when no motion is detected by said microwave detecting means for a second predetermined period of time.

Claim 22

The system according to claim 12, further comprising means for self-testing said microwave detecting means and said PIR detecting means.

Claim 23

The system according to claim 19, wherein said self-test means comprises a resistor positioned in close proximity to said PIR detecting means such that heat radiating from said resistor activates said PIR detecting means.

Claim 24

The system according to claim 19 wherein said self-test means comprises pulse-width modulating said microwave detecting means.

Claim 27

The method of according to claim 22 further comprising modifying the sensitivity of said first sensor when said first sensor detects motion a predetermined number of times.

Claim 28

The method according to claim 23, wherein the sensitivity of said first sensor is modified a number of times until said first sensor is in a predetermined maximum mode.

Claim 29

The method according to claim 22, wherein said stability of said second sensor is increased when said first sensor detects motion without verification by said second sensor for said first predetermined period of time.

Claim 30

The method according to claim 22, wherein said stability of said second sensor is decreased when said first sensor fails to detect motion for said second predetermined period of time.