Cognitive anti-jam receiver systems and associated methods

• US 8,515,335 B2
• Filed: 11/30/2009
• Issued: 08/20/2013
• Est. Priority Date: 11/30/2009
• Status: Active Grant

• Current Assignee: Aerospace Corporation
• Original Assignee: Aerospace Corporation
• Inventors: Dafesh, Philip Anthony, Prabhu, Raghavendra S., Valles, Esteban Luis
• Primary Examiner(s): GESESSE, TILAHUN
• Application Number:
  US12/627,875
• Publication Number:
  US 20110128178A1
• Time in Patent Office: 1,359 Days
• Field of Search: 455/63.1, 455/67.1, 455/1, 455/226.1, 455/422.1, 455/403
• US Class Current: 455/1
• CPC Class Codes: G01S 7/021 Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals
• CPC Class Codes: H04K 3/228 Elimination in the received signal of jamming or of data corrupted by jamming interference suppression in receivers H04B1/10

Abstract

Cognitive anti-jam receiver systems and associated methods are provided. The systems and methods may include a signal analysis module that processes a baseband signal to determine one or more signal characteristics of the baseband signal, the baseband signal comprising at least a desired signal; a cognitive decision unit that receives the one or more signal characteristics from the signal analysis module, and generates at least one first adaptive parameter; and at least one anti-jam processing module that processes the baseband signal to generate a modified signal that reduces an impact of at least one jammer signal on a quality of reception of the desired signal from the baseband signal, where processing by the at least one anti-jam processing module may be based at least in part on the received at least one first adaptive parameter from the cognitive decision unit.

Claims

1. A system, comprising:

a signal analysis module that processes a baseband signal to determine one or more signal characteristics of the baseband signal, the baseband signal comprising at least a desired signal;

a cognitive decision unit that determines, based on the one or more signal characteristics received from the signal analysis module, whether at least one jammer signal is detected in the baseband signal, and if so, generates at least one first adaptive parameter; and

at least one anti-jam processing module that processes the baseband signal to generate a modified signal that reduces an impact of the at least one jammer signal on a quality of reception of the desired signal from the baseband signal, wherein processing by the at least one anti jam processing module is based at least in part on the received at least one first adaptive parameter from the cognitive decision unit.

2. The system of claim 1, wherein the baseband signal includes one or more jammer signals, wherein the at least one anti jam processing module generates the modified signal by excising at least a portion of the one or more jammer signals from the baseband signal.

3. The system of claim 2, wherein the at least one anti jam processing module excises at least a portion of the at least one jammer signal from the baseband signal by replacing the excised portion with a predetermined value.

4. The system of claim 3, wherein the predetermined value is zero or a noise floor level.

5. The system of claim 1, wherein the cognitive decision unit further generates at least one second adaptive parameter, and further comprising:

a receiver signal processing module that processes the modified signal from the at least one anti jam processing module to extract information about the desired signal from the modified signal, wherein processing by the receiver signal processing module is based at least in part on the received at least one second adaptive parameter from the cognitive decision unit.

6. The system of claim 5, wherein the at least one anti jam processing module and the receiver signal processing module are integrated or provided in a same module.

7. The system of claim 5, wherein the modified signal includes distortion introduced from processing the baseband signal by the at least one anti jam processing module, wherein the at least one second parameter adjusts the processing of the receiver signal processing module to compensate for the distortion introduced from processing the baseband signal by the at least one anti jam processing module.

8. The system of claim 7, wherein the at least one second parameter is utilized by the receiver signal processing module to configure a pulse shape or filter utilized in processing the modified signal by the receiver signal processing module.

9. The system of claim 1, wherein the at least one first adaptive parameter designates one or more of a plurality of dimensions to utilize by the at least one anti-jam processing module when processing the baseband signal to reduce an impact of the at least one jammer signal on the quality of reception of the desired signal.

10. The system of claim 9, wherein the plurality of dimensions includes at least a time dimension and a transform dimension, wherein the cognitive decision unit designates at least one of the time dimension or the transform dimension for utilization in the at least one first adaptive parameter.

11. The system of claim 10, wherein the cognitive decision unit designates at least one of the time dimension or the transform dimension in the at least one first adaptive parameter based upon the one or more signal characteristics providing frequency support information for the at least one jammer signal, the frequency support information indicating at least one of (i) one or more frequencies where the at least one jammer signal has been detected, or (ii) whether the at least one jammer signal is a wideband signal covering a plurality of radiometer frequency sub-bands or channels.

12. The system of claim 10, wherein the at least one first adaptive parameter is utilized by the anti jam processing module to configure processing in the transform dimension, wherein the at least one first adaptive parameter is utilized to configure one or more of:

(i) a sample overlap size, (ii) a window size, or (iii) a transform type.

13. The system of claim 1, wherein the signal analysis module determines signal characteristics of one or more jammer signals present in the baseband signal based upon one or more frequency sub-bands of the baseband signal having a respective detected energy level exceeding a respective threshold value configured based upon at least one of a signal power level or a noise floor.

14. The system of claim 13, wherein a receiver signal processing module processes the modified signal from the at least one anti jam processing module to extract information about the desired signal from the modified signal, wherein the receiver signal processing module provides information on at least one of the signal power level or the noise floor to the signal analysis module.

15. The system of claim 13, wherein a plurality of radiometers is utilized by the signal analysis module to detect respective energy levels of a plurality of frequency sub-bands of the baseband signal.

18. The method of claim 16, The system of claim 1, wherein the cognitive decision unit further generates at least one second adaptive parameter, and further comprising:

processing, by a receiver signal processing module, the modified signal from the at least one anti jam processing module to extract information about the desired signal from the modified signal, wherein processing by the receiver signal processing module is based at least in part on the received at least one second adaptive parameter from the cognitive decision unit.

16. A method, comprising:

processing, by a signal analysis module, a baseband signal to determine one or more signal characteristics of the baseband signal, the baseband signal comprising at least a desired signal;

determining, by a cognitive decision unit based upon one or more signal characteristics received from the signal analysis module, whether at least one jamming signal is detected in the baseband signal, and if so, generating at least one first adaptive parameter; and

processing, by at least one anti jam processing module, the baseband signal to generate a modified signal that reduces an impact of the at least one jammer signal on a quality of reception of the desired signal from the baseband signal, wherein processing by the at least one anti jam processing module is based at least in part on the received at least one first adaptive parameter from the cognitive decision unit.

17. The method of claim 16, wherein the baseband signal includes one or more jammer signals, wherein the at least one anti jam processing module generates the modified signal by excising at least a portion of the one or more jammer signals from the baseband signal.

19. The method of claim 16, wherein the at least one first adaptive parameter designates one or more of a plurality of dimensions to utilize by the at least one anti-jam processing module when processing the baseband signal to reduce an impact of the at least one jammer signal on the quality of reception of the desired signal.

20. The method of claim 19, wherein the plurality of dimensions includes at least a time dimension and a transform dimension, wherein the cognitive decision unit designates at least one of the time dimension or the transform dimension for utilization in the at least one first adaptive parameter.

21. The method of claim 16, wherein the at least one anti jam processing module is selected, by the cognitive decision unit based on the at least one first adaptive parameter, from a plurality of anti jam processing modules.

22. A system, comprising:

a signal analysis module that processes a baseband signal to determine one or more signal characteristics of the baseband signal, the baseband signal comprising at least a desired signal;

a cognitive decision unit that receives the one or more signal characteristics from the signal analysis module, and generates at least one first adaptive parameter; and

at least one anti-jam processing module that processes the baseband signal to generate a modified signal that reduces an impact of at least one jammer signal on a quality of reception of the desired signal from the baseband signal, wherein processing by the at least one anti jam processing module is based at least in part on the received at least one first adaptive parameter from the cognitive decision unit, wherein the baseband signal includes one or more jammer signals, and wherein the at least one anti jam processing module generates the modified signal by excising at least a portion of the one or more jammer signals from the baseband signal by replacing the excised portion with a predetermined value.