Spacecraft Tracking and Data Acquisition Network
（重定向自STADAN）
The Spacecraft Tracking and Data (Acquisition) Network (STADAN or STDN) was established by NASA to satisfy the requirement for long-duration, highly-available space-to-ground communications. Real-time operational control and scheduling of the network was provided by the Network Operations Control Center (NOCC) at the Goddard Space Flight Center (GSFC) in Greenbelt, Maryland.