Anti GPS
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The document discusses improving the performance of anti-GPS signals. It introduces GPS tracking and signal structure. It then discusses jamming design issues such as accuracy, frequency, and modulation. It presents an anti-GPS simulation using a fuzzy controller with membership functions and rules to model different jamming signals. The simulation tested band-limited white noise, FM jamming signals, and multi-band limited white noise on GPS signals. Multi-band limited white noise was found to be the most effective type of jamming signal.
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Anti GPS
- 1. by Mohamed Loey Ramadan Improving the Performance of Anti-GPS Signal
- 7. 1.5 GPS in Military
- 11. 2.2 GPS Tracking Types
- 12. 2.3 Passive or Logger Tracking Device
- 13. 2.4 Real Time or Active Tracking Devices
- 18. 2.8 GPS Jamming Signal
- 24. 3.2 GPS SIGNAL STRUCTURE
- 26. 4.1 Definition
- 27. 4.1 JAMMING DESIGN ISSUES
- 28. 4.3.1 Accuracy
- 29. 4.3.2 Frequency
- 30. 4.3.3 Pulse
- 31. 4.3.4 Modulation
- 32. 4.3.5 Jamming Signal Ratio ( J/S) Range
- 33. 4.4 Jamming Signals
- 34. 4.4.1 Amplitude Modulation
- 35. 4.4.2 Frequency Modulation
- 36. 4.4.3 Band-limited White Noise
- 39. 5.2 Anti-GPS Fuzzy Controller
- 41. 5.2.1.1 Frequency Membership Function
- 42. 5.2.1.2 Pulse Repetition Frequency Membership Function
- 43. 5.2.1.3 Duty Cycle Frequency Membership Function
- 44. 5.2.1.4 GPS Error Signal Membership Function
- 45. 5.2.1.5 Jamming/Signal Membership Function
- 46. 5.2.1.6 Frequency Offset Membership Function
- 47. 5.2.1.7 Jamming Signal Membership Function
- 48. 5.2.2 Anti-GPS Fuzzy Controller Rules 1. If (GPSErrorSiganl is not Good) then (JammingSignal is NotAffect) 2. If (GPSErrorSignal is Good) and (Frequency is Same) and (pulseRepetitionFrequency is Medium) and (Duty is Medium) and (JammingSignalRatio is Medium) and FrequencyOffset is Inside) then (JammingSignal is Affect) 3. If (PulseRepetitionFrequency is VerySmall) or (DutyCycle is VerySmall) Then (JammingSignal is NotAffect) 4. If (PulseRepetitionFrequency is VeryLarge) or (DutyCycle is VeryLarge) Then (JammingSignal is Continues)
- 49. 5.2.2 Anti-GPS Fuzzy Controller Rules 5. If (FrequencyOffect is not Inside) then (JammingSignal is NotAffect) 6. If (JammingSignalRatio is Low) then (JammingSignal is NotAffect) 7. If (JammingSignalRatio is High) then (JammingSignal is NotAffect) 8. If (Frequecy is High) then (JammingSignal is NotAffect) 9. if (Frequency is Low) then (JammingSignal is NotAffect)
- 50. 5.2.3 Anti-GPS Fuzzy System Controller
- 52. 5.4 Jamming Signal Simulation
- 53. 5.4.1 Band-Limited White Noise
- 54. 5.4.1 Band-Limited White Noise
- 55. 5.4.1 Band-Limited White Noise + GPS Signal
- 56. 5.4.2 FM Jamming Signal
- 57. 5.4.2 FM Jamming Signal
- 58. 5.4.2 FM Jamming Signal +GPS Signal
- 59. 5.4.3 Multiband-Limited White Noise
- 60. 5.4.3 Multiband-Limited White Noise
- 61. 5.4.3 Multiband-Limited White Noise
- 62. 5.5 Anti-GPS in A Laboratory Environment
- 63. 5.6 Test Results
- 64. 5.6 Test Results
- 65. 5.6 Test Results
- 66. 5.6 Test Results Multi-Band limit white noise Frequency modulation Band –limit white noise Comparisons Medium High Low Noise Power Medium Low High Jamming Power Hard Too Hard Easy Jamming Detection High Medium Low Data Destroy Too Hard Hard Easy Anti-Jamming
Notas do Editor
- Phase compensation is the correction of phase error
- Ultra High Frequency (UHF) band 300 MHz – 3 GHz binary phase shift keying (BPSK) C/A code is only modulated onto the L1 carrier while the P(Y) code is modulated onto both the L1 and the L2 carrier
- Pulse Repetition Frequency (PRF) is the number of pulses transmitted per second the duty cycle is the fraction of time that a system is in an "active" state D=t/T where t :is the duration that the function is non-zero T:is the period of the function.
- Why Fuzzy: * Fuzzy techniques are powerful tools for knowledge representation and processing * Fuzzy techniques can manage the vagueness and ambiguity efficiently
- Band-Limit White Noise: Introduce white noise into a continuous system Frequency Modulation varying its frequency .
- This block models multiband noise using four different band limited white noise blocks, each one with its own power and time scale. A first order low pass filter with a selectable cut off frequency is applied to the last three noises (have look under the mask).The output sampling time has to be multiple of the first sample time. A low-pass filter is a filter that passes low- frequency signals but attenuates (reduces the amplitude of) signals with frequencies higher than the cutoff frequency Phase compensation is the correction of phase error (i.e., the difference between the actually needed phase and the obtained phase). Rate Transition: Handle transfer of data between blocks operating at different rates ,1/Z: Acts as a unit delay