Ingenicomm, Inc.

NOAA Telemetry-Over-IP

Ingenicomm was chartered by NOAA to implement a multi-site distributed earth terminal at Barrow, Alaska and Fairbanks, Alaska.

The NOAA ground station in Fairbanks, Alaska has three 13-meter antennas that can be used to support spacecraft operations. As this is insufficient to support planned contact schedules at the site, it is necessary to use a secondary antenna array located at Barrow, Alaska.

Key Design Objectives

  • Reliably transport telemetry and command data between the NOAA sites at Barrow and Fairbanks
  • Provide data buffering and store-and-forward to compensate for the low bandwidth of the Barrow-Fairbanks link
  • Allow either Barrow or Fairbanks antenna assets to be used for a ground contact without affecting other components of the ground segment

Store and Forward

  • Two pairs of RS-422 data/clock signals are ingested by the system
  • The higher-priority channel is sent directly to the network interface for encapsulation and transmission
  • The lower-priority channel is sent to a buffer on disk while the high-priority channel is active
  • When the high-priority channel completes transmission, the low-priority channel is extracted from the buffer and transmitted

Link Transparency

  • The path switching at Fairbanks is transparent to the FEP
  • The NOAA subsystems at other sites interface only with the Fairbanks FEP, not the antennas directly
  • The ground network can therefore treat the combination of Fairbanks and Barrow as a single logical earth terminal