The objective of this research is the development and flight test of a digital multi-rate VTOL autoland system. This autoland system provided the NASA/Army Fly-by-Wire CH-47 helicopter with an automatic 4-D trajectory following and landing capability. Flight tests were conducted along complex trajectories with descending, turning, and decelerating segments. The flight software consists of a trajectory generator and guidance algorithm operating at two iterations per second and a set of sensor filters and an advanced controller operating at 10 iterations per second. This low iteration rate digital controller has a proportional-integral structure that provides an autotrim function. The control gains, scheduled as a function of flight condition, are updated every two seconds. All flight software, except input/output routines, are coded in FORTRAN using floating point arithmetic and are exercised in a ROLM 1664 flight computer. The flight software, the ground and flight hardware, the autoland system's position tracking performance, and the controller's velocity and heading tracking performance are presented.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Flight test of a VTOL digital autoland system along complex trajectories


    Contributors:

    Conference:

    Guidance and Control Conference ; 1979 ; Boulder, CO


    Publication date :

    1979-01-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English





    AUTOLAND SYSTEM FOR VTOL AIRCRAFT, VTOL AIRCRAFT, AND LANDING CONTROL METHOD FOR VTOL AIRCRAFT

    KOJIMA TORU / MORI SATOSHI | European Patent Office | 2024

    Free access

    Interferometric GPS Flight Reference/Autoland System: Flight Test Results

    Van Graas, F. / Diggle, D. W. / Hueschen, R. M. | British Library Online Contents | 1994


    Autoland

    Engineering Index Backfile | 1967