Looking at http://www.noradsanta.org/ implies a Satellite based tracking system for the annual NORAD Santa tracking report. I looked at the Wikipedia article for some hint of the technology that allows NORAD to identify Santa's location, but did not find any clues. I am not sure, if NORAD has an agreement with Santa so there is some tracking device placed on the sleigh, or if they are able to identify Rudolph's nose, or in some other way identify Santa and his sleigh flying through the night sky.
My question is, other then NORAD are there any other satellite systems that would have the ability to track Santa, and if so are any of them used to track him?