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CASSIUS: The Cassini Uplink SchedulerThe Cassini Uplink Scheduler (CASSIUS) is cross-platform software used to generate a radiation sequence plan for commands being sent to the Cassini spacecraft. Because signals must travel through varying amounts of Earth's atmosphere, several different modes of constant telemetry rates have been devised. These modes guarantee that the spacecraft and the Deep Space Network agree with respect to the data transmission rate. However, the memory readout of a command will be lost if it occurs on a telemetry mode boundary. Given a list of spacecraft message files as well as the available telemetry modes, CASSIUS can find an uplink sequence that ensures safe transmission of each file. In addition, it can predict when the two on-board solid state recorders will swap. CASSIUS prevents data corruption by making sure that commands are not planned for memory readout during telemetry rate changes or a solid state recorder swap.
Document ID
20150005451
Acquisition Source
Jet Propulsion Laboratory
Document Type
Other
External Source(s)
Authors
Bellinger, Earl
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
April 10, 2015
Publication Date
August 6, 2012
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Distribution Limits
Public
Copyright
Other
Keywords
Cassini mission
spacecraft communication
Cassini Uplink Scheduler (CASSIUS)

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