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1. WO1997024575 - PROJECTILE LOCATION SYSTEM

Publication Number WO/1997/024575
Publication Date 10.07.1997
International Application No. PCT/AU1996/000837
International Filing Date 24.12.1996
Chapter 2 Demand Filed 23.06.1997
IPC
F41J 5/06 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
41WEAPONS
JTARGETS; TARGET RANGES; BULLET CATCHERS
5Target indicating systems; Target-hit or score detecting systems
06Acoustic hit-indicating systems, i.e. detecting of shock waves
G01S 5/22 2006.01
GPHYSICS
01MEASURING; TESTING
SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
5Position-fixing by co-ordinating two or more direction or position-line determinations; Position-fixing by co-ordinating two or more distance determinations
18using ultrasonic, sonic, or infrasonic waves
22Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements
CPC
F41J 5/06
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
41WEAPONS
JTARGETS; TARGET RANGES; BULLET CATCHERS
5Target indicating systems; Target-hit or score detecting systems
06Acoustic hit-indicating systems, i.e. detecting of shock waves
G01S 5/22
GPHYSICS
01MEASURING; TESTING
SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
5Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
18using ultrasonic, sonic, or infrasonic waves
22Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements
Applicants
  • UNISEARCH LTD. [AU]/[AU] (AllExceptUS)
  • BAIRD, John, Patrick [AU]/[AU] (UsOnly)
  • LAI, Joseph, Cho, Sam [AU]/[AU] (UsOnly)
Inventors
  • BAIRD, John, Patrick
  • LAI, Joseph, Cho, Sam
Agents
  • CARTER, SMITH & BEADLE
Priority Data
PN 727928.12.1995AU
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) PROJECTILE LOCATION SYSTEM
(FR) SYSTEME DE LOCALISATION DE PROJECTILES
Abstract
(EN)
A projectile location system (10, 20, 30) includes a plurality of microphones (12, 13, 14) adapted to receive the acoustic wave generated by a projectile as it passes through a planar target region (11, 21, 39). Differences in position are resolved using a statistical technique, ideally a cross correlation technique, in order to determine relative distance of the projectile from various ones of the microphones. The relative distance information is then utilised in a triangulation operation to obtain an estimate of position of the projectile in the plane of the target (11, 21, 39). In particular, a baffle (26) is interposed between the microphones and at least a portion of the target (11, 21, 39). In another particular form, the microphones are aligned along at least two separate axes which intersect at an obtuse angle.
(FR)
Cette invention concerne un système (10, 20, 30) de localisation de projectiles, lequel comprend plusieurs microphones (12, 13, 14) qui vont recevoir les ondes acoustiques générées par le projectile lorsque ce dernier traverse une zone cible plane (11, 21, 39). Les différences de positionnement sont résolues à l'aide d'une technique statistique, la meilleure consistant en une technique de corrélation croisée permettant de déterminer la distance relative entre le projectile et chacun des microphones. Les informations portant sur la distance relative sont ensuite utilisées dans une opération de triangulation afin d'obtenir une estimée de la position du projectile dans le plan de la cible (11, 21, 39). Dans des modes de réalisation particuliers, un écran sonore (26) est interposée entre les microphones et une ou plusieurs parties de la cible (11, 21, 39). Dans un autre mode de réalisation particulier, les microphones sont alignés le long de deux axes, ou plus, qui se croisent selon un angle obtus.
Also published as
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