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Wide Area Multilateration Demonstration System

Radar Research Group. Wide Area Multilateration Demonstration System. Rudolf Seller, Ádám Szüllő Budapest University of Technology and Economics. Radar Research Group. WAMLAT. Passive distributed radar system to improve ATC reliability Wide-area coverage (>10km diameter) Multiple receivers

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Wide Area Multilateration Demonstration System

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  1. Radar Research Group Wide Area Multilateration Demonstration System Rudolf Seller, Ádám Szüllő Budapest University of Technology and Economics

  2. Radar Research Group WAMLAT • Passive distributed radar system to improve ATC reliability • Wide-area coverage (>10km diameter) • Multiple receivers • Synchronization challenge • GPS based synchronization

  3. Radar Research Group WAMLAT System • GPS based synchronization • Data transfer via Ethernet • Server

  4. Radar Research Group Geometry of the Receivers • Multilateration is nonlinear • Location dependent positionestimation accuracy • Zone defined by the receivers

  5. Radar Research Group Synchronization • GPS Disciplined Oscillator (GPSDO) • No physical clock distribution network • Tens of nanosecond accuracy • Long term time difference measurement between two GPSDOs:

  6. Radar Research Group Arrangement of the Receivers • Across and around the city of Budapest • Not optimal geometry

  7. Radar Research Group Results • Persistent displaying • Fligth information from http://www.flightradar24.com

  8. Radar Research Group Results • Mode A and Mode C based multilateration has high false detection rate

  9. Radar Research Group Results • Only Mode S based multilateration

  10. Radar Research Group Results • „Invisible” aircraft

  11. Radar Research Group Location dependent accuracy • Multilateration is nonlinear

  12. Radar Research Group Accuracy of the system • Multilateration compared to ADS-B • ADS-B accuracy is questionable(eg. systematic error because of delay) • Accuracy estimation based on longterm dataset • Median error is 128 meters • Estimated accuracy is 150 meters

  13. Radar Research Group Future work • Develope tracking algorithm • Expand the system nation-wide

  14. Radar Research Group Thank You!

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