This one occured late last year and was first reported online by NASA in late January. It is the kind of test that is easy to miss, because the systems are unmanned and there is no big contract in the balance, at least not yet. But it is actually a very big deal. Details are not clear from the story at the link, but it would appear that the SAA system under test used a combination of ADS-B and TCAS-II as the raw data sources, with the actual test item being a set of software algorithms that had to decide how to use the information. Looks like the software is eventually intended to be compatible with airborne radar as well.
http://www.nasa.gov/centers/armstrong/Features/acas_xu_paves_the_way.html#.VNvPUVrn-v8
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