This system allows an unmanned aerial system (UAS) to operate and navigate in an environment devoid of a Global Navigation Satellite System (GNSS) such as the Global Positioning System (GPS). The system operates by interrogating an aviation transponder that is carried by the UAS and measuring the time elapsed for the response to multiple, ground-based antenna and using triangulation (multilateration) to locate the transponder and by association, the UAS. The ground-based system then routes this position information back to the UAS via the UAS’s data telemetry link. The autopilot can now utilize this position information for navigation in much the same way it would utilize a GPS-based position report.

Successful flight testing of this system was conducted at the Columbia Gorge Regional Airport on June 12, 2018.

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