What is ADS-B and how does it work?

With ADS-B about to become mandatory in Australia from December above FL290 this year I thought it appropriate to post this more detailed article on just what it is and how it functions (or at least, will do in Australia);

http://www.airservicesaustralia.com/...IRSERVICES.pdf

It's not an easy read being an Air Services Australia publication, but is extremely interesting for those interested in this technology more from a pilot's perspective.

Regards,
Gregg