US 2020/0029157 A1Published application

Method for acoustic detection of shooter location

AssigneeAselsan Elektronik Sanayi Ve Ticaret Anonim Sirketi

InventorsALPER BEREKETLI, SINAN AVSAR, EMIR DOGAN, MEHMET DONUS

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Abstract

A method for acoustic detection of shooter location includes the following steps: receiving acoustic signals by a microphone array; detecting muzzle blast (MB) and shock wave (SW) signals through matched filter and cross correlation processes; transforming the detected MB and SW signals from time domain into frequency domain; beamforming the signals by means of the Delay and Sum method in frequency domain; estimating the direction of arrival (DOA) for the MB and SW signals by finding the azimuth and elevation which give the maximum power of the beamforming response; performing range estimation using the difference between the arrival time of the MB and SW signals together with the DOA estimations.

Claims20

Dependent claims

A method for an acoustic determination of a shooter location, comprising the following procedural steps:

receiving acoustic signals by a microphone array;
detecting a muzzle blast (MB) signal and a shock wave (SW) signal through a matched filter and cross correlation processes;
transforming the MB signal and the SW signal from a time domain into a frequency domain;
beamforming the MB signal and the SW signal by means of a Delay and Sum method in the frequency domain to obtain a MB beam and a SW beam;
estimating a direction of arrival (DOA) for the MB signal and a direction of arrival (DOA) for the SW signal by finding an azimuth and elevation, wherein the azimuth and elevation indicates the DOA of the MB signal having a maximum power of the MB beam and the DOA of the SW signal having a maximum power of the SW beam;
performing a range estimation using a difference between arrival time of the MB signal and arrival time of the SW signal, the DOA for the MB signal, and the DOA for the SW signal.

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Dependencies are inferred from the claim text.

Facts

Application: 16/232,094Filed 26 Dec 2018
Priority: TR 2017/2198726 Dec 2017
Published: 23 Jan 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

F41J 5/06
Target indicating systems; Target-hit or score detecting systems: acoustic hit-indicating systems, i.e. detecting of shock waves
H04R 5/04
Stereophonic arrangements: circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker…
G01S 3/808
Systems for determining direction or deviation from predetermined direction: using transducers spaced apart and measuring phase or time difference…
G01S 5/22
Using ultrasonic, sonic or infrasonic waves: position of source determined by co-ordinating a plurality of position lines defined by…