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TARGET DETECTION SYSTEM USING AN ACTIVE THRESHOLD VALUE BASED ON A VIBRATION SENSOR, CAPABLE OF REDUCING THE RATE OF FALSE ALARM BY GRADATIONALLY INFORMING THE RISK OF A TARGET STATE, AND A TARGET DETECTION METHOD THEREOF
TARGET DETECTION SYSTEM USING AN ACTIVE THRESHOLD VALUE BASED ON A VIBRATION SENSOR, CAPABLE OF REDUCING THE RATE OF FALSE ALARM BY GRADATIONALLY INFORMING THE RISK OF A TARGET STATE, AND A TARGET DETECTION METHOD THEREOF
PURPOSE: A target detection system using an active threshold value based on a vibration sensor and a target detection method thereof are provided to improve reliability of target detection by using an active threshold value according to noise characteristics under the environment in which the target detection system is operated.;CONSTITUTION: A target detection system using an active threshold value based on a vibration sensor and a target detection method thereof includes a vibration sensor unit (10), a low pass filter unit (20), an envelope detection unit (40), a threshold value calculation unit (50), and a target detection unit (60). The vibration sensor unit detects a vibration signal which corresponds to the movement of a target. The low pass filter unit removes a high frequency signal from a vibration signal, and detects a desired frequency signal. The envelope signal detection unit detects an envelope signal which corresponds to the frequency change amount of a detected frequency signal. The threshold value calculation unit extracts the distribution characteristics of a targeting signal and a noise signal which correspond to the envelope signal. The thresh value calculation unit calculates a threshold value which satisfies the false alarm rate in the range which is predetermined according to the extracted distribution characteristics. The target detection unit detects a signal which exceeds the calculated threshold value. The target detection unit displays the movement state of a target which corresponds to the occupancy time of the target signal.;COPYRIGHT KIPO 2013;[Reference numerals] (10) Vibration sensor unit; (20) Low pass filter unit; (30) Rectification unit; (40) Envelope detection unit; (50) Threshold value calculation unit; (60) Target detection unit; (AA) Target; (BB) Signal
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