A two-year task sponsored by NASA's Mars Technology Program's Advanced Entry, Descent and Landing (EDL) work area includes investigation of improvements to EDL navigation by processing spacecraft-to-spacecraft radiometric data. Spacecraft-to-spacecraft navigation will take advantage of the UHF link between two spacecraft (i.e. to an orbiter from an approaching lander for EDL telemetry relay) to build radiometric data, specifically the velocity between the two spacecraft along the radio beam, that are processed to determine position and velocity in real time. The improved onboard state knowledge provided by spacecraft-to-spacecraft navigation will improve the performance of entry guidance by providing a more accurate state estimate and ultimately reduce the landed position error. A previous paper documented the progress of the first year of this task, including the spacecraft definitions, selection and documentation of the required algorithms and analysis results used to define the algorithm set. The final year of this task is reported here. Topics include modifications to the previously selected algorithm set for implementation, and performance of the implemented algorithms in a stand-alone filter, on an emulator of the target processor and finally on a breadboard processing unit.


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    Title :

    Real-Time EDL Navigation Performance Using Spacecraft to Spacecraft Radiometric Data


    Contributors:

    Conference:

    AIAA Guidance, Navigation and Control Conference ; 2006 ; Keystone, CO, United States


    Publication date :

    2006-01-21


    Type of media :

    Preprint


    Type of material :

    No indication


    Language :

    English




    Real-Time EDL Navigation Performance Using Spacecraft to Spacecraft Radiometric Data

    Burkhart, P / Ely, Todd / Duncan, Courtney et al. | AIAA | 2006


    Real-Time EDL Navigation Performance Using Spacecraft to Spacecraft Radiometric Data

    Burkhart, P. Daniel / Ely, Todd / Duncan, Courtney et al. | NTRS | 2006


    AIAA-2006-6566 Real-Time EDL Navigation Performance Using Spacecraft to Spacecraft Radiometric Data

    Burkhart, P. / Ely, T. / Duncan, C. et al. | British Library Conference Proceedings | 2006


    Expected EDL Navigation Performance with Spacecraft to Spacecraft Radiometric Data

    Burkhart, P / Ely, Todd / Duncan, Courtney et al. | AIAA | 2005


    Expected EDL navigation performance with spacecraft to spacecraft radiometric data

    Burkhart, P. Daniel / Ely, Todd / Duncan, Courtney et al. | NTRS | 2005