BROADBAND MULTI-CHANNEL DETECTOR WITH SIGNAL AND JAMMING DISCRIMINATION

• US 20080084345A1
• Filed: 07/17/2007
• Published: 04/10/2008
• Est. Priority Date: 07/19/2006
• Status: Abandoned Application

• Current Assignee: Sensis Pty Limited (Telstra Group Ltd.)
• Original Assignee: Sensis Pty Limited (Telstra Group Ltd.)
• Inventors: McMahon, Stephen, Rougas, John, Owen, Douglas
• Application Number:
  US11/778,992
• Publication Number:
  US 20080084345A1
• Time in Patent Office: Days
• US Class Current: 342/14
• CPC Class Codes: G01S 7/38 Jamming means, e.g. producing false echoes
• CPC Class Codes: H04K 2203/16 for telephony
• CPC Class Codes: H04K 2203/24 for communication related to weapons
• CPC Class Codes: H04K 3/42 characterized by the control of the jamming frequency or wavelength
• CPC Class Codes: H04K 3/43 characterized by the control of the jamming power, signal-to-noise ratio or geographic coverage area
• CPC Class Codes: H04K 3/92 related to allowing or preventing remote control
• CPC Class Codes: H04K 3/94 related to allowing or preventing testing or assessing

Abstract

Methods of determining whether a jamming signal strength is adequate, comprising receiving a signal, determining first and second noise power levels of the signal in first and second ranges of frequencies, the first range being broader than and encompassing the second range, and calculating a ratio of the second noise power level divided by the first noise power level. Also, methods of determining whether a jamming signal strength is adequate, comprising receiving a signal, determining a phase difference between first and second frequency range phases of the signal, and calculating a statistical mean and/or a standard deviation of the phase difference. Also, systems for determining whether a jamming signal is adequate, computer-readable media for determining whether jamming signal strength is adequate, systems comprising means for transmitting a jamming signal, and systems comprising means for transmitting and receiving waveforms to users in the presence of protective jamming.

Claims

1. A method of determining whether a jamming signal strength is adequate, comprising:

receiving at least a first signal;

determining a first signal first noise power level, said first signal first noise power level being a power level of said first signal in a first range of frequencies;

determining a first signal second noise power level, said first signal second noise power level being a power level of said first signal in a second range of frequencies, said first range of frequencies being broader than and encompassing said second range of frequencies; and

calculating a first signal second noise power level/first noise power level ratio, said first signal second noise power level/first noise power level ratio being equal to said first signal second noise power level divided by said first signal first noise power level.

2. A method as recited in claim 1, wherein said method further comprises determining whether said first signal second noise power level/first noise power level ratio is below a threshold second noise power level/first noise power level ratio.

3. A method as recited in claim 2, wherein said method further comprises activating an alarm if said first signal second noise power level/first noise power level ratio is below said threshold second noise power level/first noise power level ratio.

4. A method as recited in claim 1, wherein said method further comprises:

receiving a plurality of additional signals; and

for each said additional signal;

determining an additional signal first noise power level, said additional signal first noise power level being a power level of said additional signal in said first range of frequencies;

determining an additional signal second noise power level, said additional signal second noise power level being a power level of said additional signal in said second range of frequencies; and

calculating an additional signal second noise power level/first noise power level ratio, said additional signal second noise power level/first noise power level ratio being equal to said additional signal second noise power level divided by said additional signal first noise power level.

5. A method as recited in claim 4, wherein said method further comprises determining whether any of said additional signal second noise power level/first noise power level ratios is below said threshold second noise power level/first noise power level ratio.

6. A method as recited in claim 5, wherein said method further comprises activating an alarm if any of said additional signal second noise power level/first noise power level ratios is below said threshold second noise power level/first noise power level ratio.

27. A method as recited in claim 1, wherein said method is computer-implemented.

44. A method as recited in claim 2, wherein said method further comprises transmitting a jamming signal if said first signal second noise power level/first noise power level ratio is below said threshold second noise power level/first noise power level ratio.

45. A method as recited in claim 2, wherein said method further comprises transmitting a service-approved communications waveforms to at least one user in the presence of protective jamming if said first signal second noise power level/first noise power level ratio is below said threshold second noise power level/first noise power level ratio.

7. A method of determining whether a jamming signal strength is adequate, comprising:

receiving at least a first signal;

determining a first signal first noise power level, said first signal first noise power level being a power level of said first signal in a first range of frequencies; and

for each of a plurality of additional ranges of frequencies;

determining a first signal additional range noise power level, said first signal additional range noise power level being a power level of said first signal in said additional range of frequencies, said first range of frequencies being broader than and encompassing each of said plurality of additional ranges of frequencies; and

calculating a first signal additional range noise power level/first signal first noise power level ratio, said first signal additional range noise power level/first signal first noise power level ratio being equal to said first signal additional range noise power level divided by said first signal first noise power level.

8. A method as recited in claim 7, wherein said method further comprises determining whether any of said first signal additional range noise power level/first signal first noise power level ratios is below a threshold additional range noise power level/first noise power level ratio.

9. A method as recited in claim 8, wherein said method further comprises activating an alarm if any of said first signal additional range noise power level/first signal first noise power level ratios is below said threshold additional range noise power level/first noise power level ratio.

10. A method of determining whether a jamming signal strength is adequate, comprising:

receiving at least a first signal;

determining a phase difference between a first signal first frequency range phase and a first signal second frequency range phase, said first signal first frequency range phase being a first direct current indication of a phase of said first signal in a first range of frequencies, said first signal second frequency range phase being a second direct current indication of a phase of said first signal in a second range of frequencies, said first range of frequencies being broader than and encompassing said second range of frequencies, by subtracting said second direct current indication from said first direct current indication; and

calculating a statistical mean of said phase difference and a standard deviation of said phase difference.

11. A method as recited in claim 10, wherein said method further comprises determining whether said statistical mean is below a threshold statistical mean.

12. A method as recited in claim 11, wherein said method further comprises activating an alarm if said statistical mean is below said threshold statistical mean.

13. A method as recited in claim 10, wherein said method further comprises determining whether said standard deviation is below a standard deviation mean.

14. A method as recited in claim 11, wherein said method further comprises activating an alarm if said standard deviation is below said standard deviation mean.

15. A method as recited in claim 10, wherein said method further comprises:

determining a first range/third range phase difference between said first signal first frequency range phase and a first signal third frequency range phase, said first signal third frequency range phase being a third direct current indication of a phase of said first signal in a third range of frequencies, said first range of frequencies being broader than and encompassing said first range of frequencies, by subtracting said third direct current indication from said first direct current indication; and

calculating a statistical mean of said first range/third range phase difference and a standard deviation of said first range/third range phase difference.

16. A method as recited in claim 15, wherein said method further comprises determining whether said statistical mean of said first range/third range phase difference is below a threshold statistical mean.

17. A method as recited in claim 16, wherein said method further comprises activating an alarm if said statistical mean of said first range/third range phase difference is below said threshold statistical mean.

18. A method as recited in claim 15, wherein said method further comprises determining whether said standard deviation of said first range/third range phase difference is below a standard deviation mean.

19. A method as recited in claim 18, wherein said method further comprises activating an alarm if said standard deviation of said first range/third range phase difference is below said standard deviation mean.

20. A method as recited in claim 10, wherein said method further comprises:

receiving a plurality of additional signals; and

for each said additional signal;

determining an additional signal phase difference between a first frequency range phase of said additional signal and a second frequency range phase of said additional signal, said first frequency range phase of said additional signal being a third direct current indication of a phase of said additional signal in an additional signal first range of frequencies, said second frequency range phase of said additional signal being a fourth direct current indication of a phase of said additional signal in an additional signal second range of frequencies, by subtracting said fourth direct current indication from said third direct current indication; and

calculating a statistical mean of said additional signal phase difference and a standard deviation of said additional signal phase difference.

21. A method as recited in claim 20, wherein said method further comprises determining whether said statistical mean of said additional signal phase difference is below a threshold statistical mean.

22. A method as recited in claim 21, wherein said method further comprises activating an alarm if said statistical mean of said additional signal phase difference is below said threshold statistical mean.

23. A method as recited in claim 20, wherein said method further comprises determining whether said standard deviation of said additional signal phase difference is below a standard deviation mean.

24. A method as recited in claim 21, wherein said method further comprises activating an alarm if said standard deviation of said additional signal phase difference is below said standard deviation mean.

25. A method as recited in claim 20, wherein said additional signal first range of frequencies for a first additional signal is substantially the same as said additional signal first range of frequencies for a second additional signal.

26. A method as recited in claim 20, wherein said additional signal first range of frequencies for a first additional signal is substantially the same as said first range of frequencies.

46. A method as recited in claim 11, wherein said method further comprises transmitting a jamming signal if said statistical mean is below said threshold statistical mean.

47. A method as recited in claim 11, wherein said method further comprises transmitting a service-approved communications waveforms to at least one user in the presence of protective jamming if said statistical mean is below said threshold statistical mean.

48. A method as recited in claim 13, wherein said method further comprises transmitting a jamming signal if said standard deviation is below said standard deviation mean.

49. A method as recited in claim 13, wherein said method further comprises transmitting a service-approved communications waveforms to at least one user in the presence of protective jamming if said standard deviation is below said standard deviation mean.

28. A system for determining whether a jamming signal is adequate, said system comprising:

at least one RF antenna;

at least one RF signal detector;

means for determining a first noise power level, said first noise power level being a power level of a signal in a first range of frequencies;

means for determining a second noise power level, said second noise power level being a power level of said signal in a second range of frequencies, said first range of frequencies being broader than and encompassing said second range of frequencies; and

means for calculating a second noise power level/first noise power level ratio for said signal, said first signal second noise power level/first noise power level ratio being equal to said second noise power level divided by said first noise power level.

29. A system as recited in claim 28, wherein said system further comprises means for determining whether said second noise power level/first noise power level ratio is below a threshold second noise power level/first noise power level ratio.

30. A system as recited in claim 29, wherein said system further comprises an alarm and means for activating said alarm if said second noise power level/first noise power level ratio is below said threshold second noise power level/first noise power level ratio.

31. A system for determining whether a jamming signal is adequate, said system comprising:

at least one RF antenna;

at least one RF signal detector;

means for determining a first noise power level, said first noise power level being a power level of a first signal in a first range of frequencies;

means for determining, for each of a plurality of additional ranges of frequencies, an additional range noise power level, said additional range noise power level being a power level of said first signal in said additional range of frequencies, said first range of frequencies being broader than and encompassing each of said plurality of additional ranges of frequencies; and

means for calculating, for each of said plurality of additional ranges of frequencies, an additional range noise power level/first noise power level ratio, said additional range noise power level/first noise power level ratio being equal to said additional range noise power level divided by said first noise power level.

32. A system as recited in claim 31, wherein said system further comprises means for determining whether any of said additional range noise power level/first noise power level ratios is below a threshold additional range noise power level/first noise power level ratio.

33. A system as recited in claim 32, wherein said system further comprises an alarm and means for activating said alarm if any of said additional range noise power level/first noise power level ratios is below said threshold additional range noise power level/first noise power level ratio.

34. A system for determining whether a jamming signal strength is adequate, said system comprising:

at least one RF antenna;

at least one RF signal detector;

means for receiving at least a first signal and a second signal;

means for determining a phase difference between a first signal first frequency range phase and a first signal second frequency range phase, said first signal first frequency range phase being a first direct current indication of a phase of said first signal in a first range of frequencies, said first signal second frequency range phase being a second direct current indication of a phase of said first signal in a second range of frequencies, said first range of frequencies being broader than and encompassing said second range of frequencies, by subtracting said second direct current indication from said first direct current indication; and

means for calculating a statistical mean of said phase difference and a standard deviation of said phase difference.

35. A system as recited in claim 34, wherein said system further comprises means for determining whether said statistical mean is below a threshold statistical mean.

36. A system as recited in claim 35, wherein said system further comprises an alarm and means for activating said alarm if said statistical mean is below said threshold statistical mean.

37. A system as recited in claim 34, wherein said system further comprises means for determining whether said standard deviation is below a standard deviation mean.

38. A system as recited in claim 35, wherein said system further comprises an alarm and means for activating said alarm if said standard deviation is below said standard deviation mean.

39. A computer-readable medium having computer-executable commands for:

determining first noise power level of a first signal, said first noise power level being a power level of said first signal in a first range of frequencies;

determining a first signal second noise power level, said first signal second noise power level being a power level of said first signal in a second range of frequencies, said first range of frequencies being broader than and encompassing said second range of frequencies; and

calculating a first signal second noise power level/first noise power level ratio, said first signal second noise power level/first noise power level ratio being equal to said first signal second noise power level divided by said first signal first noise power level.

40. A computer-readable medium having computer-executable commands for:

determining a first noise power level of a first signal, said first noise power level being a power level of said first signal in a first range of frequencies; and

for each of a plurality of additional ranges of frequencies;

determining a first signal additional range noise power level, said first signal additional range noise power level being a power level of said first signal in said additional range of frequencies, said first range of frequencies being broader than and encompassing each of said plurality of additional ranges of frequencies; and

calculating a first signal additional range noise power level/first signal first noise power level ratio, said first signal additional range noise power level/first signal first noise power level ratio being equal to said first signal additional range noise power level divided by said first signal first noise power level.

41. A computer-readable medium having computer-executable commands for:

receiving at least a first signal and a second signal;

determining a phase difference between a first signal first frequency range phase and a first signal second frequency range phase, said first signal first frequency range phase being a first direct current indication of a phase of said first signal in a first range of frequencies, said first signal second frequency range phase being a second direct current indication of a phase of said first signal in a second range of frequencies, said first range of frequencies being broader than and encompassing said second range of frequencies, by subtracting said second direct current indication from said first direct current indication; and

calculating a statistical mean of said phase difference and a standard deviation of said phase difference.

42. A system comprising:

a low power RF transceiver;

a broadband RF antenna;

means for transmitting a jamming signal in response to a measured threshold crossing.

43. A system comprising:

a low power RF transceiver;

a broadband RF antenna; and

means for transmitting and receiving service-approved communications waveforms to at least one user in the presence of protective jamming.