On 3/24/2016 8:07 AM, Larry Dighera wrote:

http://www.avweb.com/avwebflash/news/NASA-ADS-B-Could-Allow-Drones-In-NAS-225878-1.html

NASA: ADS-B Could Allow Drones In NAS
By Mary Grady

Large-scale drones could safely fly in the National Airspace System by using
ADS-B technology,

The article is so vague that one can't really tell what they are doing.
But for drones in the national airspace system, ADS-B can never be
more that part of the answer for detecting and avoiding other aircraft.
Similarly, "Synthetic Vision" can only tell you what should be there,
not what really is, because it normally depends on a database of
obstructions. Further, "Sense and Avoid" is not necessarily the same as
"See and Avoid".

Current regulations do not require all general aviation aircraft to
equip with ADS-B (or any beacon/transponder technology). Plus there is
always the possibility of equipment malfunction or pilot error, which
could mean that any given airplane could go undetected by ADS-B.

Any drone technology that falls short of true video and radar "See and
Avoid" should be considered a non-starter. Don't buy the ADS-B Cool-aid!