System and method for scoring supersonic aerial projectiles

• US 6,669,477 B2
• Filed: 04/20/2001
• Issued: 12/30/2003
• Est. Priority Date: 04/20/2001
• Status: Expired due to Fees

• Current Assignee: Naval Surface Warfare Center, Corona Division
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Hulet, Brian Lee
• Primary Examiner(s): Cheng, Joe H.
• Application Number:
  US09/838,225
• Publication Number:
  US 20030008265A1
• Time in Patent Office: 984 Days
• Field of Search: 434/11, 434/12, 434/14-17, 434/19, 434/23, 434/27, 434/365, 273/371, 273/372, 731/67, 367/108, 367/124, 367/127, 367/906
• US Class Current: 434/14
• CPC Class Codes: F41J 5/06 Acoustic hit-indicating systems, i.e. detecting of shock waves F41J5/056 takes precedence
• CPC Class Codes: F41J 5/12 for indicating the distance by which a bullet misses the target F41J5/02 - F41J5/10 takes precedence

Abstract

A time-difference process and apparatus for scoring supersonic aerial projectiles, such as military aircraft air-to-ground strafing projectiles fired at a strafe target, by detecting and measuring the acoustic shock waves propagated by the projectiles. The process and apparatus uses an array of at least six dynamic transducers to independently sample each projectile shock wave and transmit sampled signals to at least one all-purpose digital computer. The time-differences of arrival of the shock waves at each transducer are processed by an iterative algorithm implemented by the computer. The algorithm calculates projectile impact point, projectile velocity and other useful scoring data. The scoring data are used to quantitatively score the number of hits or misses by the strafing projectiles on the strafe target. Scoring data and other projectile data are selectably indicated to the operator by remote display and printout.

Claims

1. A computer-based apparatus for scoring supersonic aerial projectiles by measuring the acoustic shock waves propagated by the projectiles, the apparatus comprising:

i) an array of at least six transducers disposed proximate to a strafe target, said transducers being independently operable to transmit analog signals in response to receiving acoustic shock waves propagated by supersonic aerial projectiles directed at the strafe target;

ii) a multichannel signal processor coupled to said transducers for receiving the analog signals and converting such signals to equivalent digital signals;

iii) at least one general-purpose digital computer coupled to said signal processor and operable to receive the digital signals from said signal processor;

iv) computing means implemented by said computer for computing scoring data for the supersonic aerial projectiles by iteratively measuring the digital signals; and

v) processing means implemented by said computer for indicating said scoring data.

2. The apparatus for scoring supersonic aerial projectiles of claim 1, wherein said computing means are operable to iteratively compute said scoring data by measuring the time differences of arrival of the acoustic shock waves at said transducers, said computing means being further operable to iteratively compare said scorn data to target data from the strafe target.

3. The apparatus for scoring supersonic aerial projectiles of claim 2, wherein said computing means includes a second general-purpose digital computer coupled to said computer and remotely operable to receive the digital signals from said computer to compute said scoring data.

4. The apparatus for scoring supersonic aerial projectiles of claim 3, wherein said array of transducers consists of an array of eight independently operable transducers for increasing the accuracy of said scoring data computed by said second-purpose digital computer.

5. The apparatus for scoring supersonic aerial projectiles of claim 4, wherein said multichannel signal processor is operable to automatically sample and record in response to receiving the analog signals from said transducers, said multichannel sign processor being further operable to sample the analog signals at a minimum of one hundred kilocycles per channel.

6. The apparatus for scoring supersonic aerial projectiles of claim 4, further comprising a weather station coupled to said computer, said weather station being operable to automatically transmit ambient atmospheric temperature data, wind velocity data and barometric pressure data to said second general-purpose digital computer for use in computing said scoring data.

7. The apparatus for scoring supersonic aerial projectiles of claim 4, wherein said processing means includes a display and printer coupled to sa d second general-purpose digital computer for selectably indicating said scoring data and the target data to an operator.

8. A computer-based process for scoring supersonic aerial projectiles by measuring the acoustic shock waves propagated by the aerial projectiles the process comprising:

i) receiving by at least six independently operable transducers the acoustic shock waves propagated by supersonic aerial projectiles directed at a strafe target;

vi) transmitting signals generated by said transducers in response to the acoustic shock waves to at least one general-purpose digital computer;

vii) iteratively computing by use of said computer scoring data for the supersonic aerial projectiles;

viii) iteratively comparing by use of said computer said scoring data with target data from the strafe target; and

ix) processing by use of said computer said scoring data and the target data.

9. The process for scoring supersonic aerial projectiles o claim 8, wherein the act of receiving consists of an array of eight transducers independently operable to transmit the signals in response to the acoustic shock waves propagated by the supersonic aerial projectiles.

10. The process for scoring supersonic aerial projectiles of claim 9, wherein the act of computing consists of measuring by said computer the time differences of arrival of the acoustic shock waves at said transducers to calculate said scoring data.

11. The process of scoring supersonic aerial projectiles of claim 10, wherein the act of computing further comprises a second general-purpose digital computer remotely operable to receive the signals from said computer for computing said scoring data.

12. The process for scoring supersonic aerial projectiles of claim 11, wherein the act of transmitting the signals from said transducers to said computer includes a multichannel signal processor for converting the signals from analog to digital signal format.

13. The process for scoring supersonic aerial projectiles of claim 11, wherein the act of processing includes a display and a printer coupled to said second general-purpose digital computer for selectably indicating said scoring data and the target data to the operator.

14. A computer-based system for scoring supersonic aerial projectiles by measuring the acoustic shock waves propagated by the aerial projectiles, the system comprising:

i) receiving means for detecting the acoustic shock waves propagated by supersonic aerial projectiles directed at a strafe target, wherein said receiving means comprises an array of at least six transducers disposed proximate to the strafe target and independent operable to transmit signals in response to the acoustic shock waves;

iv) transmitting means for transmitting signals generated in response to the acoustic shock waves, the signals being transmitted to at least one general-purpose digital computer;

iv) computing means implemented by said computer for computing scoring data for the supersonic aerial projectiles and for comparing said scoring data with target data from the strafe target; and

iv) processing means for indicating said scoring data and the target data.

15. The system for scoring supersonic aerial projectiles of claim 14, wherein said array of transducers consists of an array of eight transducers disposed proximate to the strafe target and independently operable to transmit signals in response to the acoustic shock waves.

16. The system for scoring supersonic aerial projectiles of claim 15, wherein said computing means further comprises a second general-purpose digital computer remotely operable to receive the signals from said computer for computing said scoring data.

17. The system for scoring supersonic aerial projectiles of claim 16 wherein said transmitting means includes a multichannel signal processor coupled to said transducers for receiving the analog signals and converting such signals to equivalent digit signals.

18. The system for scoring supersonic aerial projectiles of claim 17, wherein said computing means includes automatically measuring and using ambient atmospheric temperature data and wind velocity data for computing said scoring data.