Research and Design on Trigger System Based on Acoustic Delay Correlation Filtering

• Main Authors: Zhiyong Lei, Min Liu, Ming Lei
• Format: Article
• Language: English
• Published: IFSA Publishing, S.L. 2014-01-01
• Series: Sensors & Transducers
• Subjects: MEMS acoustic sensor; Muzzle shock wave; Delay correlation filtering.
• Online Access: http://www.sensorsportal.com/HTML/DIGEST/january_2014/Vol_163/P_1824.pdf
• ISSN: 2306-8515; 1726-5479

In the exterior trajectory test, there usually needs a muzzle or a gun muzzle trigger system to be used as start signal for other measuring device, the customary trigger systems include off- target, infrared and acoustic detection system. But inherent echo reflection of the acoustic detection system makes the original signal of sound trigger submerged in various echo interference for bursts and shooting in a closed room, so that it can’t produce accurate trigger. In order to solve this defect, this paper analyzed the mathematical model based on acoustic delay correlation filtering in detail, then put forward the constraint condition with minimum path for delay correlation filtering. In this constraint condition, delay correlation filtering can do de-noising operation accurately. In order to verify accuracy and actual performance of the model, a MEMS sound sensor was used to implement mathematical model onto project, experimental results show that this system can filter out the every path sound bounce echoes of muzzle shock wave signal and produce the desired trigger signal accurately.