From Flight Global: "DRA's sense and avoid system comprises three cameras and processors, limiting its effectiveness to visual flight rules conditions. An objective sense and avoid system must include other kinds of sensors to maintain awareness at night or in bad weather, Bachman says. ....The system only scans for targets in the forward hemisphere of the UAV, Bachman says. So far, the FAA has not provided definitive guidance on minimum performance for a sense and avoid system, but is expected to require 360° capability.
So far, DRA's system has demonstrated the ability to detect and track other aircraft moving in the forward hemisphere. In later demonstrations, the system also will be able to autonomously adjust the UAV's own flight path to avoid other air traffic, Bachman says."
New sense and avoid system for UAVs emerges from the shadows
Comments
From the pictures it looks like a very experimental setup. And like the text says: It only covers head on traffic. It´s a start, but no full solution.
And tere seems to be a product, which is, reading the text, ready to be sold and having comparable specs: http://sara.com/ISR/UAV_payloads/OCA.html
Sadly no more info (and the video on the page is actually not relatet to the product but from a german "Luna" UAV in Kabul...)
Marc