Pianissimo has the abbreviation of *pp*, representing that it is “double-piano”, as with fortissimo, which is *ff*.
Pp
Answer: Ground Antennas
Explanation:
Based on the scenario in the question, the type of station that Charlie's team manages is refered to as the ground antennas station.
This kind of station is typically used in communicating with spacecraft and is utilized for the tracking of GPS satellites in their orbits.
