SYSTEM AND METHOD FOR PRECISION ACOUSTIC EVENT DETECTION

• US 20090109796A1
• Filed: 08/30/2008
• Published: 04/30/2009
• Est. Priority Date: 01/20/2005
• Status: Active Grant

• Current Assignee: Shotspotter Incorporated
• Original Assignee: Shotspotter Incorporated
• Inventors: HOLMES, FRED, Fisher, Ken, Baxter, Kevin
• Granted Patent: US 7,751,282 B2
• Time in Patent Office: Days
• US Class Current: 367/128
• CPC Class Codes: G01S 19/41 Differential correction, e.g. DGPS [differential GPS]
• CPC Class Codes: G01S 5/0027 of actual mobile position, i.e. position determined on mobile
• CPC Class Codes: G01S 5/22 Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements G01S5/28 takes precedence

Abstract

A system and method for providing precision locations for sensors which make up an array of sensors in a gunshot detection system. In a preferred embodiment sensors employ a commercial GPS which reports a sensor position or a group of pseudoranges to GPS satellites. A server collects differential information from a differential node and, in one preferred embodiment, calculates a precision position for each sensor by adjusting the reported position or pseudoranges with the differential information. In another preferred embodiment differential information is sent from the host to individual sensors which calculate their own precision positions. Differential information may be latitude and longitude corrections, pseudorange corrections, ionospheric delay, GPS satellite clock drift, or other corrective term which will improve the accuracy of a sensor position.

Claims

1-32. -32. (canceled)

33. A system for determining a precision position for at least one sensor of a sensor array wherein WAAS information is available from a commercial GPS located proximate said sensor array, the system comprising:

an array of sensors;

a commercial GPS configured to transmit WAAS information to a host processing component;

a processing component within a sensor in the array, the processing component configured to;

receive the WAAS information; and

calculate a precision position for the sensor using the WAAS information.

34. A gunshot detection sensor comprising:

a microphone for receiving acoustic signals;

a commercial GPS receiver that obtains sensor location information from a commercial GPS source for determining sensor location information; and

a processor for processing received acoustic signals to detect an acoustic event, the processor configured for;

processing precision position data from a difference between a military GPS receiver and one or more commercial GPS receivers;

calculating a precise location as a function of the sensor location information and the precision position data, whereby the calculated precise location is more precise than the sensor location information obtained via the commercial GPS receiver of the at least one sensor.