System and method for detecting and analyzing near range weapon fire

摘要

A method for identifying a gunshot occurrence. According to one embodiment, microphone data and inertial motion data are acquired with a hand-held device. Based on an acoustic criterion, a determination is made as to whether a gunshot has been produced. Based on a correlation criterion applied to the inertial motion data, a determination is made as to whether the gunshot was produced from fire produced by a first person having physical possession of the hand-held device or by a second person spaced away from the first person.

主权项

1. A method of detecting weapon fire with a hand-held device of the type having a microphone capable of detecting acoustic energy present at the hand-held device, the hand-held device including capability of recording acoustic energy detected by the microphone, comprising:
using the microphone to continually generate a time series of acoustic voltage signals indicative of temporally varying sound pressure levels at the hand-held device; analyzing the acoustic voltage signals to identify an event for which voltage for the sound pressure level exceeds a predetermined threshold value corresponding to an acoustic energy level that limits identification of gunshot occurrences to weapon firings which occur within a predeterminable distance from the hand-held device; for an identified event, recording the acoustic voltage signals received from the microphone during a first time period on a non-transitory computer readable storage medium; determining one or more correlations in a first set, each correlations being between characteristics of the recorded acoustic voltage signals and a prior known information characteristic of a gun fire event; and determining whether the event is a gun fire event based on whether, for at least one type of correlation in the first set, the determined correlation meets or exceeds a threshold correlation value assigned to the correlation type.