The introduction of new CASs results in a multiplication of the number of different systems in the airspace. And this is not without consequences. During ACAS Xa integration tests, though the coordination was working perfectly, it was noted that the performances of TCAS were degraded. This highlighted the fact that CASs need not only to be able to coordinate but they also need to be interoperable.
A comparison between ACAS Xu and DAIDALUS has been recently performed by the NASA. Their results show some discrepancies between the two methods and some unexpected behaviors from ACAS Xu and DAIDALUS.
JARUS members shared their experience and needs with respect with Collision Avoidance Systems evaluation so the Chair could refine the scope of its BCAS benchmark project.
Unlike other ACASs (ACAS II, ACAS X), ACAS Xu can provide both vertical and horizontal resolutions. The challenge is: how to choose between vertical and horizontal maneuvers? The choice is done by a module called Nucleus. However, little information on what Nucleus might be was publicly available until last September.
As mentioned in a previous post, the RPAS Chair team has submitted two papers to the 35th Digital Avionics Systems Conference (DASC) 2016, in Sacramento, CA.