Wide Area Multilateration Demonstration System

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Presentation transcript:

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

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

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

Geometry of the Receivers Radar Research Group Geometry of the Receivers Multilateration is nonlinear Location dependent position estimation accuracy Zone defined by the receivers

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

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

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

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

Radar Research Group Results Only Mode S based multilateration

Radar Research Group Results „Invisible” aircraft

Location dependent accuracy Radar Research Group Location dependent accuracy Multilateration is nonlinear

Accuracy of the system Radar Research Group 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

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

Radar Research Group Thank You!