A Level-0 processor is a low-level command processor intended to control the spacecraft whenever the main processor is off-line. Such an event can happen during early orbit activities, during load shedding operations or during an anomaly (like the upset of the main processor due to cosmic radiation). During these periods, the safe mode processor collects a subset of normal housekeeping telemetry, formats it, and downlinks it along with the command link control word information required by the CCSDS Telecommand recommendations. This subset of normal telemetry collection includes housekeeping telemetry from critical spacecraft subsystems such as attitude control, power regulation, solar array control, and payload maintenance. To determine the optimal number of interfaces and telemetry points, SwRI polled several spacecraft vendors and used this information to implement Level-0 CCSDS command processing/telemetry collection. This paper presents Southwest Research Institute's continuing development of flexible Level-0 command and telemetry collection hardware.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Spacecraft and instrument Level-0 command and data handling subsystem


    Contributors:
    Epperly, M.E. (author) / Walls, B.J. (author)


    Publication date :

    2001-01-01


    Size :

    1056854 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Spacecraft and Instrument Level-0 Command and Data Handling Subsystem

    Epperly, M. E. | British Library Conference Proceedings | 2001



    Command and Data Subsystem for the Seawinds Instrument on QuickScat Spacecraft

    IEEE; Aerospace and Electronics Systems Society | British Library Conference Proceedings | 1999


    DubaiSat-2 Command and Data Handling Subsystem

    Belal, A.S. / Sharaf, O.A. / Al-Khajah, J.N. et al. | British Library Conference Proceedings | 2013


    Command and Data Handling Subsystem for Kitsat-3

    Hyung Shin, K. / Eurospace | British Library Conference Proceedings | 1997