System and method for precision acoustic event detection
First Claim
1. A gunshot detection system comprising:
- an array of sensors, at least one sensor of said array of sensors being a portable sensor that comprises;
a microphone for receiving acoustic signals;
a processor for processing received acoustic signals to detect an acoustic event;
a first commercial GPS receiver for providing sensor position information; and
a first network interface for transmitting the sensor position information;
a mobile differential node comprising;
a second commercial GPS receiver for providing GPS position information;
a military GPS for providing more accurate position information;
a CPU for calculating precision position information based at least upon the GPS position information and the more accurate position information; and
a second network interface for transmitting the precision position information;
a server comprising;
a third network interface in communication with said first and second network interfaces; and
a CPU for calculating a precise sensor position for said at least one sensor based on the sensor position information and the precision position information when said acoustic event is detected.
9 Assignments
0 Petitions
Accused Products
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.
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Citations
20 Claims
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1. A gunshot detection system comprising:
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an array of sensors, at least one sensor of said array of sensors being a portable sensor that comprises; a microphone for receiving acoustic signals; a processor for processing received acoustic signals to detect an acoustic event; a first commercial GPS receiver for providing sensor position information; and a first network interface for transmitting the sensor position information; a mobile differential node comprising; a second commercial GPS receiver for providing GPS position information; a military GPS for providing more accurate position information; a CPU for calculating precision position information based at least upon the GPS position information and the more accurate position information; and a second network interface for transmitting the precision position information; a server comprising; a third network interface in communication with said first and second network interfaces; and a CPU for calculating a precise sensor position for said at least one sensor based on the sensor position information and the precision position information when said acoustic event is detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In a gunshot location system having an array of commercial GPS based gunshot detection sensors, a method for determining a precision position for at least one gunshot detection sensor of said sensor array including the steps of:
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(a) receiving a sensor position from a commercial GPS receiver at said at least one gunshot detection sensor; (b) receiving a GPS position from a commercial GPS receiver at a mobile node; (c) receiving a military GPS position from a Military GPS receiver at said mobile node; (d) calculating a position difference between said military GPS position and said GPS position; and (e) calculating a precise position by adjusting said sensor position with said position difference. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of processing location information, comprising:
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providing a portable host processing unit with a military and commercial GPS receivers, wherein the portable host processing unit obtains precision position data from the difference between a military and commercial GPS receivers; providing an array of sensors in communication with the host processing unit, wherein at least one sensor of the array of sensors is a portable sensor that includes a commercial GPS receiver that obtains sensor location information from a commercial GPS source; transmitting precision position data to the at least one sensor; and 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. - View Dependent Claims (19, 20)
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Specification