Anti GPS


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Anti GPS

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  • 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
  • Anti GPS

    1. 1. by Mohamed Loey Ramadan Improving the Performance of Anti-GPS Signal
    2. 2. Agenda <ul><li>1. Introduction </li></ul><ul><li>2. GPS Tracking </li></ul><ul><li>3. GPS Signal Structure </li></ul><ul><li>4. Jamming Design Issues </li></ul><ul><li>5. Anti-GPS Simulation </li></ul><ul><li>6. Conclusion and Future Work </li></ul>
    3. 3. 1.1 What is GPS? <ul><li>Global Positioning System (GPS) is a satellites based navigation system made up of a network of 24 satellites. </li></ul>
    4. 4. 1.2 GPS Application
    5. 5. 1.3 What is Anti-GPS ? <ul><li>Anti-GPS is a technology that prevents the GPS loggers, trackers and GPS/GSM devices to get GPS positions from the satellites. </li></ul><ul><li>Why ? </li></ul>
    6. 6. 1.4 GPS Misuse
    7. 7. 1.5 GPS in Military
    8. 8. 1.6 Joint Direct Attack Munition <ul><li>JDAM equipped bombs are guided to their target by an integrated inertial guidance system coupled with a Global Positioning System (GPS) receiver for enhanced accuracy </li></ul>
    9. 9. Agenda <ul><li>1. Introduction </li></ul><ul><li>2. GPS Tracking </li></ul><ul><li>3. GPS Signal Structure </li></ul><ul><li>4. Jamming Design Issues </li></ul><ul><li>5. Anti-GPS Simulation </li></ul><ul><li>6. Conclusion and Future Work </li></ul>
    10. 10. 2.1 Definition <ul><li>Technology allows anyone to track anyone else using GPS technology. </li></ul>
    11. 11. 2.2 GPS Tracking Types
    12. 12. 2.3 Passive or Logger Tracking Device
    13. 13. 2.4 Real Time or Active Tracking Devices
    14. 14. 2.5 Detecting Tracing Device <ul><li>Tracking device is the most difficult to detect and defend against. </li></ul><ul><li>These devices can be as small as a matchbook and can be hidden just about anywhere. </li></ul>
    15. 15. 2.6 Detectors <ul><li>Radio Frequency (RF) detector/scanner </li></ul><ul><ul><li>Smart R.F. Counter </li></ul></ul><ul><ul><li>Micro Bug Detector </li></ul></ul><ul><li>Price from 100-1000$ </li></ul>
    16. 16. 2.7 Disadvantage RF Detectors <ul><li>Only detects the transmissions of the GPS device when the device is actually transmitting. </li></ul><ul><li>Difficult to block and see GPS tracking devices. </li></ul>
    17. 17. 2.8 GPS JAMMING SIGNAL <ul><li>Anti-GPS is a advice that prevents the GPS devices from getting positions from satellites. </li></ul>
    18. 18. 2.8 GPS Jamming Signal
    19. 19. Agenda <ul><li>1. Introduction </li></ul><ul><li>2. GPS Tracking </li></ul><ul><li>3. GPS SIGNAL STRUCTURE </li></ul><ul><li>4. JAMMING DESIGN ISSUES </li></ul><ul><li>5. Anti-GPS Simulation </li></ul><ul><li>6. Conclusion and Future Work </li></ul>
    20. 20. 3.1 Definition <ul><li>To design a simulation software for GPS signals. It is necessary to know the characteristics of the signal and data transmitted from the GPS satellites and received by the GPS receiver antenna. </li></ul>
    21. 21. 3.2 GPS Signal Characteristics <ul><li>GPS signals are Ultra High Frequency (UHF), UHF band from 500 MHz to 3 GHz. </li></ul><ul><li>GPS navigation data has a bit rate of 50 bps. </li></ul>
    22. 22. 3.2 GPS Signal Characteristics <ul><li>GPS signals have two codes </li></ul><ul><ul><li>C/A (coarse acquisition) code is 1,023 bits long a pseudo random code (PRN) which looks like a random code but is clearly defined for each satellite. </li></ul></ul><ul><ul><li>P(Y) code is 6.1871 × 10 12 bits long a PRN To prevent unauthorized users </li></ul></ul>
    23. 23. 3.2 GPS Signal Characteristics <ul><li>Carrier signal is: </li></ul><ul><ul><li>L1=1575.42 MHz </li></ul></ul><ul><ul><li>L2=1227.60 MHz </li></ul></ul><ul><li>Carrier signal and data signals are modulated using binary phase shift keying (BPSK) </li></ul><ul><li>L1 carry C/A + P(Y) code but L2 only carry P(Y) code </li></ul>
    24. 24. 3.2 GPS SIGNAL STRUCTURE
    25. 25. Agenda <ul><li>1. Introduction </li></ul><ul><li>2. GPS Tracking </li></ul><ul><li>3. GPS Signal Structure </li></ul><ul><li>4. Jamming Design Issues </li></ul><ul><li>5. Anti-GPS Simulation </li></ul><ul><li>6. Conclusion and Future Work </li></ul>
    26. 26. 4.1 Definition
    28. 28. 4.3.1 Accuracy
    29. 29. 4.3.2 Frequency
    30. 30. 4.3.3 Pulse
    31. 31. 4.3.4 Modulation
    32. 32. 4.3.5 Jamming Signal Ratio ( J/S) Range
    33. 33. 4.4 Jamming Signals
    34. 34. 4.4.1 Amplitude Modulation
    35. 35. 4.4.2 Frequency Modulation
    36. 36. 4.4.3 Band-limited White Noise
    37. 37. Agenda <ul><li>1. Introduction </li></ul><ul><li>2. GPS Tracking </li></ul><ul><li>3. GPS Signal Structure </li></ul><ul><li>4. Jamming Design Issues </li></ul><ul><li>5. Anti-GPS Simulation </li></ul><ul><li>6. Conclusion and Future Work </li></ul>
    38. 38. 5.1 Anti-GPS Simulation
    39. 39. 5.2 Anti-GPS Fuzzy Controller
    40. 40. 5.2.1 Membership Functions <ul><li>A curve that defines how each point in the input space is mapped to a membership value (or degree of membership) between 0 and 1. </li></ul>
    41. 41. Frequency Membership Function
    42. 42. Pulse Repetition Frequency Membership Function
    43. 43. Duty Cycle Frequency Membership Function
    44. 44. GPS Error Signal Membership Function
    45. 45. Jamming/Signal Membership Function
    46. 46. Frequency Offset Membership Function
    47. 47. Jamming Signal Membership Function
    48. 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. 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. 50. 5.2.3 Anti-GPS Fuzzy System Controller
    51. 51. 5.3 Modeling Process
    52. 52. 5.4 Jamming Signal Simulation
    53. 53. 5.4.1 Band-Limited White Noise
    54. 54. 5.4.1 Band-Limited White Noise
    55. 55. 5.4.1 Band-Limited White Noise + GPS Signal
    56. 56. 5.4.2 FM Jamming Signal
    57. 57. 5.4.2 FM Jamming Signal
    58. 58. 5.4.2 FM Jamming Signal +GPS Signal
    59. 59. 5.4.3 Multiband-Limited White Noise
    60. 60. 5.4.3 Multiband-Limited White Noise
    61. 61. 5.4.3 Multiband-Limited White Noise
    62. 62. 5.5 Anti-GPS in A Laboratory Environment
    63. 63. 5.6 Test Results
    64. 64. 5.6 Test Results
    65. 65. 5.6 Test Results
    66. 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
    67. 67. Agenda <ul><li>1. Introduction </li></ul><ul><li>2. GPS Tracking </li></ul><ul><li>3. GPS Signal Structure </li></ul><ul><li>4. Jamming Design Issues </li></ul><ul><li>5. Anti-GPS Simulation </li></ul><ul><li>6. Conclusion and Future Work </li></ul>
    68. 68. 6.1 Conclusion <ul><li>We recommend our proposed with new schema called Multiband-limit white noise as: </li></ul><ul><ul><li>It has multi channel of band-limit white noise so it more jamming signal. </li></ul></ul><ul><ul><li>It is difficult to detect using anti-jamming. </li></ul></ul><ul><li>Develop new fuzzy controller that simulate jamming controller in laboratory test. </li></ul>
    69. 69. 6.2 Contributions <ul><li>HESHAM N. ELMAHDY and MOHAMED L. Ramadan, “Improving the Performance of Anti-GPS Signal,”, In Proceedings of WSEAS SIP 09: The 8 th World Scientific and Engineering Academy and Society international conference on Signal Processing , Istanbul, Turkey, June 2009. </li></ul>
    70. 70. 6.3 Future work <ul><li>Simulate more complex and strong jamming GPS signal with less power consume. </li></ul><ul><li>Make jamming controller using neuro-fuzzy. </li></ul><ul><li>Make our simulation result in laboratory test. </li></ul>