Voilà ce que j'ai trouvé pour l'instant :
Police scanner is great for detereming cargo. You get different pings, and color for the random cargo containers in space. If you scan with it when close enough it will determine if there is illegal cargo on board. It also scans and lets you know if there are missiles in cargo as well. I am not sure about the advanced scanner, as i just skipped to the police scanner early on in the game, it was my first purchase, after 2 hours i ended up with around 4-5 million in goods to sell at the station, not counting all the rockets i picked up.
Blue - high value cargo
White - standard cargo
Illegal - turns blue with double ping at short range, starts out as white.
Pings also tell different cargo, its something you have to listen to to recognize, by sound and length. its basically like sonar, you can identify cargo type by listening to the tone and length of the ping. Its pretty easy for me to ID rockets in most cargo.
Also, there are containers that i am unable to ID, so i am not sure if there are more scanner types then what we see in game.