Automatic Dependent Surveillance - Broadcast (ADS-B) is the most CSWaP compatible safety solution for Unmanned Aerial Systems (UAS) and will be mandated for use by the FAA in the National Airspace System (NAS) by 2020. The ongoing miniaturization efforts will continue to enable a cooperative approach to the integration of UAS into NAS moving forward. A critical limitation of ADS-B is the use of GPS-derived position vector in its broadcast, which can be easily spoofed or jammed, or confused by reflections in urban areas. We present a low-CSWaP solution to secure and verify the GPS integrity using a novel antenna design so that ADS-B can be used as a trusted vehicle to vehicle communications and navigation link for UAS.
