An acoustic based sniper detection system prototype

In this work, an acoustic-based sniper detection system prototype geometry and its operational principals are presented from the signal processing perspective. The prototype consists of a microphone network positioned in a specific geometric structure in the three dimensional space. The system depends on estimating the delay of arrival of sound waves reaching the microphones and using the delay information in order to calculate the direction of the sound source. The time difference of arrival problem is solved by using the generalized cross correlation approach. The estimated delay is then transformed into angles using the far field approximation. The found angle is the angle between the sound source and the microphone pair axis. Using the angles calculated for different microphone pairs, the direction is reported with azimuth and elevation. The study reports the simulation results and laboratory experiments.