Robert J Calhoun, 39Floral Park, NY

7474589, Jan 6, 2009

Oct 10, 2006

11/546529

Robert L. Showen - Los Altos CA, US
Robert B. Calhoun - Oberlin OH, US
Jason W. Dunham - San Francisco CA, US

Shotspotter, Inc. - Mountain View CA

G01S 3/80

367127

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.

7599252, Oct 6, 2009

Jul 11, 2008

12/172163

Robert L Showen - Los Altos CA, US
Robert B. Calhoun - Oberlin OH, US
Jason W. Dunham - San Francisco CA, US

ShotSpotter, Inc. - Mountain View CA

G01S 3/80

367127

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.

8134889, Mar 13, 2012

Jan 24, 2011

13/012781

Robert L. Showen - Los Altos CA, US
Robert B. Calhoun - Oberlin OH, US
Jason W. Dunham - San Francisco CA, US

ShotSpotter, Inc. - Mountain View CA

G01S 3/80

367127, 367128, 367906

Systems and methods are disclosed for processing weapon fire information such as gunfire. In one exemplary implementation, there is provided a method of processing gunshot information to determine source location information involving echo/reflection processing features. Moreover, the method may include processing gunshot information received from a source at a sensor having a reflecting surface at a given distance, processing direct arrival time and echo arrival time information, and determining source location information as a function of a virtual sensor calculated behind the surface.

2010011, May 13, 2010

Oct 5, 2009

12/573775

Robert L. Showen - Los Altos CA, US
Robert B. Calhoun - Oberlin OH, US
Jason W. Dunham - San Francisco CA, US

G01S 3/80

367127

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.