Method and a system for locating a firearm on the basis of acoustic detection
First Claim
1. A method of locating a firearm firing projectiles, the method making use of an acoustic detection antenna that comprises i microphones, where i is not less than three, which microphones are spaced apart from one another in known manner, the method comprising the steps of:
- detecting and recording in time, the signals SiA and the time offsets tiA thereof as delivered by the i microphones and representative of the soundwave (A) emitted by the Mach cone generated by a projectile that has supersonic muzzle velocity; and
detecting and recording in time, the signals SiB and the time offsets tiB thereof as delivered by the i microphones (6) and representative of the muzzle noise (B) of the firearm; and
processing said signals SiA representative of the Mach cone soundwave (a) and the time offsets tiA and processing said signals SiB and their time offsets tiB in such a manner as to determine at least the direction φ
B in which the firearm is located.
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Accused Products
Abstract
Location of a firearm firing projectiles is accomplished by using an acoustic detection antenna that includes at least three microphones spaced apart from one another to detect and record signals and time offsets of the signals which are representative of the muzzle noise of the firearm and/or the soundwave emitted by the mach cone generated by a projectile that has supersonic muzzle velocity, and processing the signals and their time offsets in such a manner as to determine at least the direction in which the firearm is located.
57 Citations
10 Claims
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1. A method of locating a firearm firing projectiles, the method making use of an acoustic detection antenna that comprises i microphones, where i is not less than three, which microphones are spaced apart from one another in known manner, the method comprising the steps of:
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detecting and recording in time, the signals SiA and the time offsets tiA thereof as delivered by the i microphones and representative of the soundwave (A) emitted by the Mach cone generated by a projectile that has supersonic muzzle velocity; and detecting and recording in time, the signals SiB and the time offsets tiB thereof as delivered by the i microphones (6) and representative of the muzzle noise (B) of the firearm; and processing said signals SiA representative of the Mach cone soundwave (a) and the time offsets tiA and processing said signals SiB and their time offsets tiB in such a manner as to determine at least the direction φ
B in which the firearm is located. - View Dependent Claims (2, 3, 4, 5)
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5. A method according to claim 3, further comprising the steps of using firstly the form of the muzzle noise signal as a function of velocity and range D, and secondly prerecorded firing tables characterizing various types of weapon on the basis of projectile speed as a function of range, to determine the type of projectile and the type of weapon used.
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6. Apparatus for locating a firearm firing projectiles, the apparatus using an acoustic detection antenna that includes at least i microphones, where i≧
- 3, where the microphones are spaced apart from one another in known manner, the apparatus being characterized in that it comprises;
a microphone conditioning stage; and a processing and display unit comprising; means for detecting and recording in time, the signals SiA and the time offsets tiA thereof as delivered by the i microphones and representative of the soundwave (A) emitted by the Mach cone generated by a projectile that has supersonic muzzle velocity; and means for detecting and recording in time, the signals SiB and the time offsets tiB thereof as delivered by the i microphones and representative of the muzzle noise (B) of the firearm; and means for processing said signals SiA representative of the Mach cone soundwave (a) and the time offsets tiA and processing said signals SiB and their time offsets tiB in such a manner as to determine at least the direction φ
B in which the firearm is located; anddisplay means indicating at least the directions in which the firearm is located. - View Dependent Claims (7, 8, 9, 10)
- 3, where the microphones are spaced apart from one another in known manner, the apparatus being characterized in that it comprises;
Specification