Soft, precise landings may be needed for logistic support of future manned missions; terminal descent guidance concept proposed uses proportional navigation plus logarithmic deceleration in initial guided phase of flight and switches at predetermined range to unguided gravity turn, thereby achieving soft landing with vertical attitude at touchdown; guidance simulation studies have shown concept to be effective in reducing target miss distance resulting from dispersions in initial flight conditions, caused by uncertainties in retro burnout and errors in instrument measurement and command execution; landing accuracy of 500-ft circular error probability is achievable.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Terminal guidance for soft and accurate lunar landing for unmanned spacecraft


    Additional title:

    J Spacecraft Rockets


    Contributors:

    Published in:

    Publication date :

    1968


    Size :

    5 pages


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English


    Keywords :




    Terminal Guidance System For Soft Lunar Landing

    Farrior, James S. / Roberson, Robert E. | AIAA | 1962


    Terminal guidance and control techniques for soft lunar landing

    Kriegsman, B.A. / Reiss, M.H. | Engineering Index Backfile | 1962