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Active Localization of a Silent Intruder with Audible Frequency in 2D Security Space
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- Authors
- Kihyun Kim, Daesung Kim, Homin Ryu, Semyung Wang, Sung Q Lee, Kang-Ho Park
- Issue Date
- 2012-08
- Citation
- International Congress and Exposition on Noise Control Engineering (Inter-Noise) 2012, pp.1-8
- Language
- English
- Type
- Conference Paper
- Abstract
- This paper mainly addresses an active localization technique to detect the location of a silent intruder with audible frequency. A number of sensors are used in building security system. Acoustic sensors such as microphones and ultrasound sensors detect noise of an intruder or distinguish variation of acoustic field, so microphones can be employed to sense the intrusion or transmit location of the event to a security camera. However, because an intruder tries to enter the security zone quietly, localization techniques of a silent intruder are also necessary to get spatial information in a closed space. We set a strategy to estimate the angle and distance of a silent intruder using audible frequency and acoustic imaging in targeted security space. First, a microphone array and a loudspeaker are fixed at the same position. Second, burst sine is generated in non-intrusion and the measured signals from a microphone array are considered as reference signals, then also measured signals in intrusion are thought of as intrusion signals. Third, the deconvolution technique is used to extract reflected signals resulted in intrusion using reference signals and intrusion signals. Fourth, beamforming and beam steering with the reflected signals are applied to make acoustic imaging. We considered a silent intruder as an object, a PVC pipe, and tested the proposed technique to find locations of a PVC pipe in an anechoic chamber.
- KSP Keywords
- Acoustic Field, Acoustic Sensor, Acoustic imaging, Active Localization, Anechoic Chamber, Closed space, Microphone arrays, PVC pipe, Reflected signals, beam steering, localization techniques