Elimination of spurious data in radar cross-section calculations and measurements

• US 8,242,952 B1
• Filed: 01/27/2010
• Issued: 08/14/2012
• Est. Priority Date: 01/27/2010
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Barr, Samuel Allan
• Primary Examiner(s): Sotomayor, John B
• Application Number:
  US12/694,721
• Time in Patent Office: 930 Days
• Field of Search: 342/22, 342/27, 342 54- 58, 342/90, 342/159, 342/192, 342/195
• US Class Current: 342/90
• CPC Class Codes: G01S 13/885 for ground probing prospecting or detecting using electromagnetic waves G01V3/12
• CPC Class Codes: G01S 7/412 based on a comparison between measured values and known or stored values
• CPC Class Codes: G01S 7/414 Discriminating targets with respect to background clutter

Abstract

Presented is a system and method for eliminating spurious data in radar cross section (RCS) data. The system and method receives RCS data, and determines an expected number of scattering centers for an object of interest in said RCS data. The RCS data is processed to remove a plurality of frequency components in said RCS data based at least in part upon said expected number of scattering centers, and the RCS data is reconstructed without said plurality of frequency components to produce a reconstructed RCS data for the object of interest. In an embodiment, the TLS-Prony transform is used to transform the RCS data into a set of damped frequency components and coefficients, which are then constrained to the expected number of scattering centers in the known object using a TLS-Prong linear prediction order, and the order of the frequency components is varied until the order yields a least-error approximation.

Claims

1. A method for eliminating spurious data in RCS data, comprising:

receiving radar cross section (RCS) data;

determining an expected number of scattering centers for an object of interest in said RCS data;

processing said RCS data to remove a plurality of frequency components in said RCS data based at least in part upon said expected number of scattering centers; and

reconstructing said RCS data without said plurality of frequency components to produce a reconstructed RCS data.

2. The method of claim 1, further comprising:

identifying said object of interest in said RCS data.

3. The method of claim 2, wherein said operation of identifying is selected from the group consisting of comparing said RCS data with RCS data for known objects, identifying a spectral signature indicative of an object having materials identified with mines and bombs, and identifying a spectral signature of an object having a geometry identified with mines and bombs.

4. The method of claim 1, wherein said operation of processing further comprises:

transforming said RCS data into a set of damped frequency components and coefficients using a TLS-Prong transform.

5. The method of claim 1, wherein said operation of processing further comprises:

constraining said set of damped frequency components and coefficients to said expected number of scattering centers in said object of interest.

6. The method of claim 1, wherein said operation of processing further comprises:

varying an order of said set of damped frequency components and coefficients until said order yields a least-error approximation of said set of damped frequency components and coefficients.

7. The method of claim 1, further comprising:

outputting said reconstructing RCS data as said RCS data of said object of interest.

8. A method for identifying scattering centers for known objects in RCS data, comprising:

finding magnitude and phase representation of RCS data for a known object;

determining an expected number of scattering centers for said known object based on a geometry of said known object;

transforming said RCS data into a frequency domain representation;

removing a plurality of frequency components in said RCS data based at least in part upon said expected number of scattering centers;

reconstructing said RCS data without said plurality of frequency components to produce a reconstructed RCS data; and

storing said reconstructed RCS data.

9. The method of claim 8, wherein said operation of finding is selected from the group consisting of measuring, modeling, estimating, and simulating.

10. The method of claim 8, wherein said operation of transforming further comprises:

transforming said RCS data into a set of damped frequency components and coefficients using a TLS-Prong transform.

11. The method of claim 8, wherein said operation of removing further comprises:

constraining said set of damped frequency components and coefficients to said expected number of scattering centers in said known object.

12. The method of claim 11, wherein said operation of removing further comprises:

ordering said set of damped frequency components using a TLS-Prong linear prediction order.

13. The method of claim 11, wherein said operation of removing further comprises:

varying an order of the damped frequency components and coefficients until said order yields a least-error approximation of the set of damped frequency components and coefficients.

14. An object detection system, comprising:

a radar that beams a signal and receives a return signal of radar cross section (RCS) data from an object of interest; and

a signal processor, adapted to;

receive said radar cross section (RCS) data;

determine an expected number of scattering centers for said object of interest in said RCS data;

process said RCS data to remove a plurality of frequency components in said RCS data based at least in part upon said expected number of scattering centers; and

reconstruct said RCS data without said plurality of frequency components to produce a reconstructed RCS data.

15. The system of claim 14, wherein said signal processor is further adapted to:

identify said object of interest in said RCS data;

transform said RCS data into a set of damped frequency components and coefficients using a TLS-Prong transform;

constrain said set of damped frequency components and coefficients to said expected number of scattering centers in said object of interest; and

output said reconstructing RCS data as said RCS data of said object of interest.

16. The system of claim 15, wherein said identifying is performed using a data store of RCS data for a plurality of previously characterized objects of interest.

17. The system of claim 14, wherein said radar and said signal processor are mounted to a vehicle.

18. The system of claim 14, further comprising:

a camera for displaying a visual image of said object of interest.

19. The system of claim 14, further comprising:

a communications system for relaying information regarding said object of interest.

20. The system of claim 14, wherein said radar is an electronically steerable radar.