Generating radar signatures for multiple objects

• US 7,592,947 B1
• Filed: 09/18/2008
• Issued: 09/22/2009
• Est. Priority Date: 09/18/2008
• Status: Active Grant

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Lee, Chul J.
• Primary Examiner(s): Tarcza; Thomas H
• Assistant Examiner(s): Bythrow; Peter M
• Application Number:
  US12/212,787
• Time in Patent Office: 369 Days
• Field of Search: 342159-164, 342/169, 342175-186, 345/321, 345/324, 345/326
• US Class Current: 342/169
• CPC Class Codes: G01S 7/295 Means for transforming co-ordinates or for evaluating data, e.g. using computers
• CPC Class Codes: G01S 7/412 based on a comparison between measured values and known or stored values
• CPC Class Codes: G06T 15/06 Ray-tracing

Abstract

In one aspect, a method to generate radar signatures for multiple objects includes performing in parallel a shooting and bouncing (SBR) technique to solve for physical optics and multi-bounce characteristics of a plurality of objects in motion, a physical theory (PTD) technique to solve for material edges of the objects and a incremental length diffraction coefficient (ILDC) to solve for material boss/channel. The method also includes coherently integrating the results from the SBR, PTD and ILDC techniques by frequency and generating the radar cross section (RCS) values of the plurality of objects. Performing the SBR technique includes evaluating rays independently.

Claims

1. A method to generate radar signatures for multiple objects comprising:

performing in parallel a shooting and bouncing (SBR) technique to solve for physical optics and multi-bounce characteristics of a plurality of objects in motion, a physical theory (PTD) technique to solve for material edges of the objects and a incremental length diffraction coefficient (ILDC) to solve for material boss/channel;

coherently integrating the results from the SBR, PTD and ILDC techniques by frequency; and

generating the radar cross section (RCS) values of the plurality of objects, wherein performing the SBR technique comprises evaluating rays independently.

2. The method of claim 1, further comprising rendering, in real-time, the plurality of objects based on trajectories of the objects.

3. The method of claim 1 wherein generating the RCS values of the plurality of objects comprises generating the RCS values of the plurality of objects in real-time.

4. The method of claim 1 wherein generating the RCS values of the plurality of objects comprises generating the RCS values of the plurality of objects such that for an object d/λ

is greater than 30 where d is equal to a length of an object and λ

is a wavelength.

5. The method of claim 1 wherein generating the RCS values of the plurality of objects comprises:

including RCS interaction among multiple objects, and

including only RCS values that a radar source can observe.

6. An apparatus to generate radar signatures for multiple objects, comprising:

circuitry to;

perform in parallel a shooting and bouncing (SBR) technique to solve for physical optics and multi-bounce characteristics of a plurality of objects in motion, a physical theory (PTD) technique to solve for material edges of the objects and a incremental length diffraction coefficient (ILDC) to solve for material boss/channel;

coherently integrate the results from the SBR, PTD and ILDC techniques by frequency; and

generate the radar cross section (RCS) values of the plurality of objects,

wherein the circuitry to perform the SBR technique comprises circuitry to evaluate rays independently.

7. The apparatus of claim 6 wherein the circuitry comprises at least one of a processor, a memory, programmable logic and logic gates.

8. The apparatus of claim 6, further comprising circuitry to render, in real-time, the plurality of objects based on trajectories of the objects.

9. The apparatus of claim 6 wherein circuitry to generate the RCS values of the plurality of objects comprises circuitry to generate the RCS values of the plurality of objects in real-time.

10. The apparatus of claim 6 wherein circuitry to generate the RCS values of the plurality of objects comprises circuitry to generate the RCS values of the plurality of objects such that for an object d/λ

is greater than 30 where d is equal to a length of an object and λ

is a wavelength.

11. The apparatus of claim 6 wherein circuitry to generate the RCS values of the plurality of objects comprises circuitry to:

include RCS interaction among multiple objects, and

include only RCS values that a radar source can observe.

12. An article comprising:

a machine-readable medium that stores executable instructions to generate radar signatures for multiple objects, the instructions causing a machine to;

perform in parallel a shooting and bouncing (SBR) technique to solve for physical optics and multi-bounce characteristics of a plurality of objects in motion, a physical theory (PTD) technique to solve for material edges of the objects and a incremental length diffraction coefficient (ILDC) to solve for material boss/channel;

coherently integrate the results from the SBR, PTD and ILDC techniques by frequency; and

generate the radar cross section (RCS) values of the plurality of objects,

wherein the instructions causing a machine to perform the SBR technique comprises instructions causing a machine to evaluate rays independently.

13. The article of claim 12, further comprising instructions causing a machine to render, in real-time, the plurality of objects based on trajectories of the objects.

14. The article of claim 12 wherein the instructions causing a machine to generate the RCS values of the plurality of objects comprises instructions causing a machine to generate the RCS values of the plurality of objects in real-time.

15. The article of claim 12 wherein instructions causing a machine to generate the RCS values of the plurality of objects comprises instructions causing a machine to generate the RCS values of the plurality of objects such that for an object d/λ

is greater than 30 where d is equal to a length of an object and λ

is a wavelength.

16. The article of claim 12 wherein instructions causing a machine to generate the RCS values of the plurality of objects comprises instructions causing a machine to:

include RCS interaction among multiple objects, and

include only RCS values that a radar source can observe.

17. A method to generate radar signatures for multiple objects comprising:

performing in parallel a shooting and bouncing (SBR) technique to solve for physical optics and multi-bounce characteristics of a plurality of objects in motion, a physical theory (PTD) technique to solve for material edges of the objects and a incremental length diffraction coefficient (ILDC) to solve for material boss/channel;

coherently integrating the results from the SBR, PTD and ILDC techniques by frequency;

generating the radar cross section (RCS) values of the plurality of objects in real-time;

rendering, in real-time, the plurality of objects based on trajectories of the objects,

wherein performing the SBR technique comprises evaluating rays independently.

18. The method of claim 17 wherein generating the RCS values of the plurality of objects comprises generating the RCS values of the plurality of objects such that for an object d/λ

is greater than 30 where d is equal to a length of an object and λ

is a wavelength.

19. The method of claim 18 wherein each of the SBR, PTD, and ILDC techniques solve for physical phenomena for each polarization comprising vertical-vertical (V-V), vertical-horizontal (V-H), horizontal-vertical (H-V), horizontal-horizontal (H-H).

20. The method of claim 19 wherein generating the RCS values of the plurality of objects comprises:

including RCS interaction among multiple objects, and

including only RCS values that a radar source can observe.