Would an ASTERIX decoder be "radar data processing" or "surveillance data processing"? I am not an air traffic controller, I am a software engineer. I developed an ASTERIX decoder, the application will just extract all the information and save it in a text file. 
I am just wondering how we can make use of the application in a real system.

Is that what we call Radar Data Processing or Surveillance Data Processing?

Edit: 
I know that my question was ambiguous.So, I will try to clarify it further.
Is the information extracted from the ASTERIX messages useful for the Controller to conduct his work ?
You would call this surveillance data processing, but typically surveillance data processing involves much more than decoding ASTERIX.

ASTERIX has many formats, not only radar but also multilateration, ADS-B, tracker output etc, hence the more generic term surveillance is used in lieu of radar.