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Todd Humphreys and Jahshan Bhatti , UT Austin Brent Ledvina , Coherent Navigation

The GPS Assimilator A Method for Upgrading Existing GPS User Equipment to Improve Accuracy, Robustness, and Resistance to Spoofing. Todd Humphreys and Jahshan Bhatti , UT Austin Brent Ledvina , Coherent Navigation ION 2010, Portland Oregon.

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Todd Humphreys and Jahshan Bhatti , UT Austin Brent Ledvina , Coherent Navigation

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  1. The GPS Assimilator A Method for Upgrading Existing GPS User Equipment toImprove Accuracy, Robustness, and Resistance to Spoofing Todd Humphreys and JahshanBhatti, UT Austin Brent Ledvina, Coherent Navigation ION 2010, Portland Oregon

  2. Q: What will GNSS receivers look like 5 years from today?

  3. All-In-View Commercial RXs (2010) SeptentrioGeNeRx1 Trimble NetR9 Javad G3T LeicaGRX1200+GNSS Topcon NET-G3A

  4. Emerging Threat: GPS RF Interference

  5. Emerging Threat: Civil GPS Spoofing

  6. Example Systems Relying on Embedded GPS Phasor Measurement Unit GPS Time and Frequency Receiver

  7. Goal: Upgrade Path for GPS Receivers • All-in-view capability • Weak-signal tracking • RF Interference robustness • Spoofing resistance • No software modifications to RX required • No hardware modifications to RX required

  8. Conceptual GPS Assimilator

  9. Assimilator Software Structure

  10. The Embedded GPS Signal Simulator

  11. Assimilator Prototype

  12. Inside the Box Dual-Frequency RF Front End

  13. Inside the Box RF Back End

  14. Inside the Box Interface Board

  15. Inside the Box Digital Signal Processor

  16. Optimal Output Signal Composition

  17. Usage Example: Protecting a GPS Time and Frequency Receiver

  18. Usage Example: Reducing Ionospheric Errors

  19. Usage Example: Harnessing CDMA Cellular Signals as Aid for Weak GPS Signal Tracking

  20. Assimilator Prototype II

  21. Receiver Clock Corrections via CDMA Cellular Signal Aiding

  22. Benefit of CDMA Cell Signal Aiding Pre-detection SNR for received C/No = 7 dB-Hz

  23. Summary • Assimilative technique offers: • Weak-signal tracking • RF Interference robustness • Spoofing resistance • No hardware or software modifications required • L1 C/A + L2C prototype reduces ionospheric errors • L1 C/A + CDMA cellular prototype suggests extended coherent integration possible for weak-signal tracking

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