Patent application number | Description | Published |
20080279046 | ACOUSTIC LOCATION OF GUNSHOTS USING COMBINED ANGLE OF ARRIVAL AND TIME OF ARRIVAL MEASUREMENTS - A gunshot location system computes candidate gunshot locations [ | 11-13-2008 |
20100118658 | ACOUSTIC LOCATION OF GUNSHOTS USING COMBINED ANGLE OF ARRIVAL AND TIME OF ARRIVAL MEASUREMENTS - A gunshot location system computes candidate gunshot locations from angle-of-arrival information and time-of-arrival information provided by acoustic sensors. In addition to an angle, each sensor calculates an angular uncertainty from impulses received at four or more microphones having rotational symmetry. An intersection of one or more time-of-arrival hyperbolas with one or more angle-of-arrival beams is used to determine a candidate gunshot location. In simple environments, a location can be confirmed with just two sensors allowing sensor density to be significantly reduced, while in complex environments including reflections, blocking, and interfering acoustic events, the additional angle-of-arrival information improves location accuracy and confidence, allowing elimination of candidate locations inconsistent with the combined time-of-arrival and angle-of-arrival information. | 05-13-2010 |
20110169633 | SYSTEMS AND METHODS OF AUTOMATED CORRELATION OF WEAPON FIRE DATA WITH MONITORED PERSONS-OF-INTEREST/LOCATION DATA - Systems and methods are disclosed for processing information associated with monitoring persons/devices and weapon fire location information. In one exemplary implementation, a weapon fire location system is used to characterize and locate impulsive events and these locations are correlated with the positions of monitoring persons or devices, such as monitoring anklets placed on offenders or other persons of interest. Further, various information can be plotted on map, display, or for other graphical output to assist in the process of handling a weapon fire event. For example, when a monitoring device, whose position can be provided by GPS or alternate methods is found nearby a gunshot location, then associated graphical information can be presented on the output of the weapon fire location system or an associated display used by those monitoring the offenders. | 07-14-2011 |
20120182837 | Systems and methods of locating weapon fire incidents using measurements/data from acoustic, optical, seismic, and/or other sensors - Systems and methods are disclosed for locating a weapon fire incident such as an acoustic transient from a gunshot, explosion, weapons launch, etc. In one exemplary implementation, there is provided a method of locating the incident from a combination of propagation phenomena including a discharge time of the weapon fire incident. Moreover, the method may include obtaining a first propagation parameter of the incident from one or more first sensors, obtaining the discharge time from another sensor, and processing the data to determine a location using a common time basis among sensor measurements. According to further exemplary implementations, the discharge time may include a transient event that has a different propagation velocity than that of sound in the atmosphere. | 07-19-2012 |
20120275273 | ACOUSTIC SURVEY METHODS IN WEAPONS LOCATION SYSTEMS - A survey method giving improvements in weapons fire location systems is disclosed. In an urban system with a distributed array in the midst of many buildings that block signal paths or create echoes, methods are provided to measure signal propagation. A survey or tour of the covered region uses a moving signal source to probe propagation inside the region. Survey results may indicate where more or fewer sensors are needed. Survey results plus current measured noise gives prediction of instantaneous system sensitivity. In addition, multipath propagation may be used to determine a location even when only one or two sensors detect the signal. In such exemplary cases, triangulation may be replaced or augmented by pattern recognition. Further, signals of the survey need not be acoustic impulses such as gunfire, but may be RF signals, or coded continuous signals so that gunfire-like sounds would not disturb citizens in the area. | 11-01-2012 |