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Spacecraft Level Zero

NSSDCA ID: ENHK-00001

Availability: Data Accessible Elsewhere

Description

The IMAGE Housekeeping data is taken from two RAD-6000 processors: The Central Interface Data Processor (CIDP) which provides acquisition, compression, storage, and telemetry formatting of science data from all imagers; health and status monitoring; and interface with the Spacecraft/System Control Unit (SCU).

From the CIDP and SC UDF files the following CDF formatted files were derived for specific housekeeping categories: IM_HK_ADS: Image Attitude Determination System Housekeeping, IM_HK_AST: Image Autonomous Star Tracker Housekeeping, IM_HK_COM: Image Communication Systems Housekeeping, IM_HK_FSW: Image Flight Software Housekeeping, IM_HK_PWR: Image Power Systems Housekeeping, IM_HK_TML: Image Thermal Housekeeping

These files can be browsed using the CDAWeb service: http://cdaweb.gsfc.nasa.gov

Relevant websites pertaining to the IMAGE spacecraft housekeeping: http://pluto.space.swri.edu/IMAGE/cidp.html and http://pluto.space.swri.edu/IMAGE/spacecraft_table.html

Further details on the functions provided by the CIDP and the SCU.

(from Section 3.4 in Gibson, W.C., et al.,"The IMAGE Observatory", Space Science Reviews, 91,15-50,2000.) The CIDP provides the following major functions for the Observatory: (1) Instrument data acquisition, processing, and compression. (2) Stored command processing. (3) Command receipt (from the SCU), processing, storage (if a delayed command), and transfer to the instruments. (4) Time/attitude synchronization with the spacecraft's Attitude Determination and Control system for generation of the nadir and sun pulse signals sent to the instruments. (5) Deckplate thermal control. (6) Additional EEPROM storage for instrument software or tables. (7) Power switching and current limiting.

The SCU provides the following major functions for the Observatory: (1) Ground command receipt, processing, storage (for delayed command execution) and relay to the CIDP. (2) Telemetry data formatting and downlink. (3) Spacecraft attitude determination and control. (4) Spacecraft thermal control. (5) Spacecraft power management. (6) Spacecraft housekeeping data acquisition, formatting, and storage. (7) Management of the Mass Memory Module. (8) Management of the engineering and high speed telemetry downlink. (9) Safe/hold management of the Observatory.

Alternate Names

    Discipline

    • Engineering: Housekeeping

    Additional Information

    Spacecraft

    Questions and comments about this data collection can be directed to: Dr. Leonard N. Garcia

     

    Personnel

    NameRoleOriginal AffiliationE-mail
    Mr. Richard BurleyGeneral ContactNASA Goddard Space Flight Centerrick.burley@gsfc.nasa.gov
    Dr. Shing F. FungGeneral ContactNASA Goddard Space Flight Centershing.fung@gsfc.nasa.gov
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