Determining miss distance and bullet speed of a burst of bullets

Patent metadata

Field	Value
Publication number	US-10191136-B2
Application number	US-201515028519-A
Country	US
Kind code	B2
Filing date	Aug 6, 2015
Priority date	Aug 6, 2014
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

Disclosed is an example for determining miss distance and bullet speed of a burst of bullets. In one example, shock wave (SW) vectors emanating from bullets are estimated using a first sensor. Further, firing point (FP) vectors and closest-point-of-approach (CPA) vectors emanating from the bullets are estimated using a second sensor. The first sensor and the second sensor are disposed on a platform. The SW vectors, the FP vectors and the CPA vectors are determined as emanating from the burst of bullets. The miss distance and bullet speed of the burst of bullets are determined using the FP vectors, the SW vectors, and the CPA vectors that are emanating from the burst of bullets.

First claim

What is claimed is:

1. A method for determining miss distance and bullet speed of a burst of bullets, the method comprising:
estimating shock wave (SW) vectors emanating from bullets using a first sensor;
estimating firing point (FP) vectors and closest-point-of-approach (CPA) vectors emanating from the bullets using a second sensor, wherein the first sensor and the second sensor are located on a single platform;
determining that the SW vectors, the FP vectors and the CPA vectors are emanating from the burst of bullets; and
determining the miss distance and bullet speed of the burst of bullets using the FP vectors, the SW vectors, and the CPA vectors that are emanating from the burst of bullets.

2. The method of claim 1 , wherein determining that the SW vectors, the FP vectors and the CPA vectors are emanating from the burst of bullets, comprises:
computing a shock angle between the CPA vectors and the SW vectors; and
determining that the SW vectors, the FP vectors and the CPA vectors are emanating from the same burst of bullets when the computed shock angle is within a predetermined range.

3. The method of claim 1 , wherein determining that the SW vector, the FP vector and the CPA vector are emanating from the burst of bullets comprises:
performing a coplanar check to determine whether the FP vectors, the CPA vectors, and the SW vectors are substantially coplanar; and
determining that the SW vectors, the FP vectors and the CPA vectors are emanating from the same burst of bullets when the FP vectors, the CPA vectors, and the SW vectors are substantially coplanar.

4. The method of claim 1 , wherein determining that the SW vectors, the FP vectors and the CPA vectors are emanating from the burst of bullets comprises:
determining whether the SW vectors lies in between the CPA vectors and the FP vectors; and
determining that the SW vectors, the FP vectors and the CPA vectors are emanating from the same burst of bullets when the SW vectors lies in between the CPA vectors and the FR vectors.

5. The method of claim 1 , wherein the SW vectors comprise a direction of SWs of the bullets relative to the platform, and wherein the FP vectors and the CPA vectors comprise a direction of FPs and a direction of CPAs, respectively, of the bullets relative to the platform.

6. The method of claim 1 , wherein the first sensor comprises an acoustic sensor, and wherein the second sensor comprises an electro-optic sensor.

7. The method of claim 1 , wherein determining the miss distance and bullet speed of the burst of bullets using the FP vectors, the SW vectors, and the CPA vectors that are emanating from the burst of bullets, comprises:
computing an aggregated estimate of the SW vectors, an aggregated estimate of the FR vectors, and an aggregated estimate of the CPA vectors; and
determining the miss distance and bullet speed of the burst of bullets using the aggregated estimate of the SW vectors, the aggregated estimate of the FR vectors and the aggregated estimate of the CPA vectors.

8. A system for determining miss distance and bullet speed of a burst of bullets, the system comprising:
a first sensor to detect shock wave (SW) vectors emanating from bullets;
a second sensor to detect firing point (FP) vectors and closest-point-of-approach (CPA) vectors emanating from the bullets, wherein the first sensor and the second sensor are located on a single platform;
a computational unit communicatively coupled to the first sensor and the second sensor, the computational unit is configured to:
determine that the SW vectors, the FP vectors and the CPA vectors are emanating from the burst of bullets; and
determine the miss distance and bullet speed of the burst of bullets using the FP vectors, the SW vectors, and the CPA vectors that are emanating from the burst of bullets.

9. The system of claim 8 , wherein the computational unit determines the miss distance and bullet speed of the burst of bullets by:
computing an aggregated estimate of the SW vectors, an aggregated estimate of the FP vectors, and an aggregated estimate of the CPA vectors; and
determining the miss distance and bullet speed of the burst of bullets using the aggregated estimate of the SW vectors, the aggregated estimate of the FP vectors and the aggregated estimate of the CPA vectors.

10. The system of claim 8 , wherein the computational unit determines that the SW vectors, the FP vectors and the CPA vectors are emanating from the burst of bullets by:
computing a shock angle between the CPA vectors and the SW vectors; and
determining that the SW vectors, the FP vectors and the CPA vectors are emanating from the same burst of bullets when the computed shock angle is within a predetermined range.

11. The system of claim 8 , wherein the computational unit determines that the SW vectors, the FP vectors and the CPA vectors are emanating from the burst of bullets by:
performing a coplanar check to determine whether the FP vectors, the CPA vectors, and the SW vectors are substantially coplanar; and
determining that the SW vectors, the FP vectors and the CPA vectors are emanating from the same burst of bullets when the FP vectors, the CPA vectors, and the SW vectors are substantially coplanar.

12. The system of claim 8 , wherein the computational unit determines that the SW vectors, the FP vectors and the CPA vectors are emanating from the burst of bullets by:
determining whether the SW vectors lies in between the CPA vectors and the FP vectors; and
determining that the SW vectors, the FP vectors and the CPA vectors are emanating from the same burst of bullets when the SW vectors lies in between the CPA vectors and the FP vectors.

13. The system of claim 8 , wherein the first sensor comprises an acoustic sensor, and wherein the second sensor comprises an electro-optic sensor.

14. A non-transitory computer-readable storage medium including instructions that are executed by a computation unit to:
receive shock wave (SW) vectors emanating from bullets using a first sensor;
receive firing point (FP) vectors and closest-point-of-approach (CPA) vectors emanating from the bullets using a second sensor, wherein the first sensor and the second sensor are located on a single platform;
determine that the SW vectors, the FP vectors and the CPA vectors are emanating from a burst of bullets; and
determine a miss distance and bullet speed of the burst of bullets using the FP vectors, the SW vectors, and the CPA vectors that are emanating from the burst of bullets.

15. The non-transitory computer-readable storage medium of claim 14 . wherein determining that the SW vectors, the FP vectors and the CPA vectors are emanating from the burst of bullets, comprises:
computing a shock angle between the CPA vectors and the SW vectors; and
determining that the SW vectors, the FP vectors and the CPA vectors are emanating from the same burst of bullets when the computed shock angle is within a predetermined range.

16. The non-transitory computer-readable storage medium of claim 14 , wherein determining that the SW vector, the FP vector and the CPA vector are emanating from the burst of bullets comprises:
performing a coplanar check to determine whether the FP vectors, the CPA vectors, and the SW vectors are substantially coplanar; and
determining that the SW vectors, the FP vectors and the CPA vectors are emanating from the same burst of bullets when the FP vectors, the CPA vectors, and the SW vectors are substantially coplanar.

17. The non-transitory computer-readable storage medium of claim 14 , wherein determining that the SW

Assignees

• Bae Systems Information And Electronics System Integration Inc
• Bae Sys Inf & Elect Sys Integ

Inventors

• Takahashi Jonathan R
• Ebersole Jr John F
• Harris Brian A

Classifications

• G01S3/782

  Systems for determining direction or deviation from predetermined direction · CPC title

• G01S3/8086

  determining other position line of source · CPC title

• G01S11/14 Primary

  using ultrasonic, sonic or infrasonic waves · CPC title

• G01S3/808 Primary

  using transducers spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems · CPC title

• F41G3/147 Primary

  based on detection of a firing weapon · CPC title