System and method for detecting emitter signals in the presence of unwanted signals

• US 20060227035A1
• Filed: 03/31/2005
• Published: 10/12/2006
• Est. Priority Date: 03/31/2005
• Status: Active Grant

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Gounalis, Anthony J.
• Granted Patent: US 7,193,555 B2
• Time in Patent Office: Days
• US Class Current: 342/13
• CPC Class Codes: G01S 7/021 Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals

Abstract

A method for receiving at least one signal emitted by at least one emitter includes defining a first dwell associated with a first signal. The first dwell has a frequency range that overlaps at least a portion of a frequency range of a second signal. The method also includes detecting the second signal responsive to the first dwell if the first dwell satisfies at least one criterion for detecting the second signal. The method further includes rejecting the second signal responsive to a characteristic of the second signal if the first dwell fails to satisfy the at least one criterion.

Claims

1. A method for receiving, by at least one receiver, at least one signal emitted by at least one emitter, the method comprising:

defining a first dwell associated with a first signal, the dwell having a frequency range that overlaps at least a portion of a frequency range of a second signal; and

detecting the second signal responsive to the first dwell if the first dwell satisfies at least one criterion for detecting the second signal, or

rejecting the second signal responsive to a characteristic of the second signal if the first dwell fails to satisfy the at least one criterion.

2. The method of claim 1, wherein the at least one criterion is associated with a relevancy requirement.

3. The method of claim 2, wherein the second signal is associated with at least one irrelevant signal, and the first dwell fails to satisfy the at least one criterion.

4. The method of claim 3, wherein the characteristic of the second signal is associated with a pulse width of the second signal, and rejecting comprises determining that a sensed signal is associated with the second signal by comparing a pulse width of the sensed signal to a predetermined pulse width.

5. The method of claim 4, wherein rejecting further comprises rejecting the sensed signal as the second signal if the pulse width of the sensed signal is less than the predetermined pulse width.

6. The method of claim 1, wherein the characteristic is associated with a signal-rejection screen, and rejecting comprises selecting the signal-rejection screen from the group consisting of a pulse-width screen, a frequency-agile processing screen, a phase screen, an amplitude screen, a frequency screen, and function-enable screens.

7. The method of claim 1, wherein the at least one criterion is associated with a probability of detection of the second signal responsive to the first dwell.

8. The method of claim 7, wherein the first dwell fails to satisfy the at least one criterion, and, wherein a second dwell has a greater probability of detection of the second signal than the probability of detection of the second signal responsive to the first dwell.

9. The method of claim 1, wherein defining the first dwell comprises selecting a repetition rate of the first dwell, and further comprising defining a second dwell associated with the second signal, selecting a repetition rate of the second dwell, and eliminating one or more repetitions associated with the repetition rate if the second dwell accommodates the eliminated one or more repetitions.

10. The method of claim 1, wherein the at least one characteristic of the first signal is different than the at least one characteristic of the second signal.

11. The method of claim 1, wherein the first signal is emitted by a first relevant emitter and the second signal is emitted by a second relevant emitter.

12. The method of claim 1, further comprising detecting the first signal by a receiver responsive to the first dwell.

13. The method of claim 12, wherein the frequency range of the first dwell overlaps substantially all of a frequency range of the first signal.

14. The method of claim 1, wherein the at least one criterion is associated with a cost of processing of the second signal responsive to the first dwell.

15. The method of claim 1, wherein the second signal is a frequency-agile signal, and the at least one criterion is associated with an fraction of the overlap of the at least the portion of the frequency range of the second signal.

16. The method of claim 1, wherein the frequency range of the first dwell overlaps at least a portion of a frequency range of the first signal, and wherein the first dwell is associated with an amount of time a receiver is tuned to the frequency range, how often the receiver revisits the frequency range, and a detecting method.

17. The method of claim 1, wherein the at least one receiver comprises an analog receiver.

18. The method of claim 1, wherein the at least one receiver comprises a digital receiver.

19. A receiver system for receiving an emitter signal, the system comprising a memory having stored therein a scan strategy, the scan strategy being created by a method comprising:

defining a first dwell associated with a first signal, the dwell having a frequency range that overlaps at least a portion of a frequency range of a second signal; and

detecting the second signal responsive to the first dwell if the first dwell satisfies at least one criterion for detecting the second signal, or

rejecting the second signal responsive to a characteristic of the second signal if the first dwell fails to satisfy the at least one criterion.

20. The receiver system of claim 19, further comprising an interface adapted to receive the scan strategy.

21. The receiver system of claim 19, wherein the characteristic is associated with a signal-rejection screen, and rejecting comprises selecting the signal-rejection screen from the group consisting of a pulse-width screen, a frequency-agile processing screen, a phase screen, an amplitude screen, a frequency screen, and function-enable screens.

22. The receiver system of claim 19, wherein defining the first dwell comprises selecting a repetition rate of the first dwell, and further comprising defining a second dwell associated with the second signal, selecting a repetition rate of the second dwell, and eliminating one or more repetitions associated with the repetition rate if the second dwell accommodates the eliminated one or more repetitions.

23. The receiver system of claim 19, wherein the at least one criterion is associated with a cost of processing of the second signal responsive to the first dwell.

24. The receiver system of claim 19, wherein the second signal is a frequency-agile signal, and the at least one criterion is associated with an fraction of the overlap of the at least the portion of the frequency range of the second signal.

25. The receiver system of claim 19, wherein the frequency range of the first dwell overlaps at least a portion of a frequency range of the first signal, and wherein the first dwell is associated with an amount of time a receiver is tuned to the frequency range, how often the receiver revisits the frequency range, and a detecting method.