For decades, military and other national security agencies have been denied unfettered access to the National Air
Space (NAS) because their unmanned aircraft lack a highly reliable and effective collision avoidance capability.
The controlling agency, the Federal Aviation Administration, justifiably demands "no harm" to the safety of the
NAS. To overcome the constraints imposed on Unmanned Aircraft Systems (UAS) use of the NAS, a new, complex,
conformable collision avoidance system has been developed - one that will be effective in all flyable weather
conditions, overcoming the shortfalls of other sensing systems, including radar, lidar, acoustic, EO/IR, etc., while
meeting form factor and cost criteria suitable for Tier II UAS operations. The system also targets Tier I as an
ultimate goal, understanding the operational limitations of the smallest UASs may require modification of the design
that is suitable for Tier II and higher. The All Weather Sense and Avoid System (AWSAS) takes into account the
FAA's plan to incorporate ADS-B (out) for all aircraft by 2020, and it is intended to make collision avoidance
capability available for UAS entry into the NAS as early as 2013. When approved, UASs can fly mission or training
flights in the NAS free of the constraints presently in place. Upon implementation this system will achieve collision
avoidance capability for UASs deployed for national security purposes and will allow expansion of UAS usage for
commercial or other civil purposes.