IBM Systems Journal - 2002 Copyright

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IBM Journal of Research and Development  
Volume 9, Number 1, Page 12 (1970)
Nontopical Issue
  Full article: arrowPDF   arrowCopyright info


Trajectory control programs in support of Apollo missions

by D. R. Quarles
Once the trajectory of a spacecraft in flight has been predicted, control measures are required to ensure that the trajectory data is applied in a consistent manner when calculating the many trajectory-related parameters required by the flight controllers of the space flight. This paper describes the queue control techniques used in generating the predicted trajectory and the subsequent use of the trajectory data. The queue control logic that is discussed requires a minimum amount of main storage while a task is waiting to be performed.
Related Subjects: General Applications