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NASA Space Science Data Coordinated Archive Header


NSSDCA ID: 1999-068A

Telecommunications Description

Data is downlinked during one or two TDRSS Ku-band Single Access (KSA) contacts per orbit. On-board High Rate Tape Recorders (HRTRs) store data and replays them during scheduled contacts. Each recorder can store more than one orbit of data. The playback rate is normally 150 Mbps. EOS-AM1 will also have Direct Broadcast (DB), Direct Downlink (DDL), and Direct Playback (DP) X-band services. DB data will be from the MODIS instrument directly to user-provided ground stations. ASTER is the only instrument that requires direct downlink transmissions (at 105 Mbps). Up to 16 kbps are available for real-time transmission during TDRSS contacts.

Telemetry Path

Telemetry support via Tracking and Data Relay Satellite System (TDRSS)

Effective Telemetry

1144 kbps

Telemetry Rates

16 - 150000 kbps

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

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