в зоне видимости
• The satellite has at least one of the ground stations in view when it receives the emergency transmission.
• The satellite passes within view of a system ground station.
Русско-английский научно-технический словарь• The satellite has at least one of the ground stations in view when it receives the emergency transmission.
• The satellite passes within view of a system ground station.
Русско-английский научно-технический словарь