This paper presents a discussion of a hybrid simulation used to dynamically verify the Saturn Guidance and Control subsystems. First, the Saturn vehicle is briefly described to provide background information. The Instrument Unit (IU) is considered in more detail to give a proper setting for the Guidance and Flight Control (G and FC) discussion that follows. After a brief description of the actual G and FC System operation, simulation models of the G and FC components are considered in detail. This is followed by a discussion of the model assignment to a particular computer (digital or analog) and justification for making that assignment. Finally, results of the AS-204/LM1 hybrid simulation studies are briefly considered with mention of the actual flight data.
The introduction notes, "The Saturn V launch vehicle is being developed by the National Aeronautics and Space Administration's George C. Marshall Space Flight Center for Project Apollo; Saturn I and Saturn IB vehicles are providing the early testing and support for Project Apollo. The nerve center of the Saturn is its guidance and control system. An airborne digital computer provides the link which closes both the guidance and control loops,making verification of the flight computer program of vital importance. During a powered flight this onboard digital computer program can be divided into four major parts:a) guidance, including navigation, b) control, c) vehicle sequencing, and d) computer telemetry."
The abstract notes, "This paper describes the Automatic Saturn V Page Test System. The system is used to evaluate microminiature Unit Logic Device (ULD) circuits. A page is an assembly consisting of a magnesium- lithium frame, an input-output connector, test points, and multilateral printed circuit boards that interconnect the IUDs into logic circuits. The test system automatically performs tests for shorted voltages and shorted diodes, static logic function, and pulse function."
These are the facts about IBM's role as a NASA prime contractor in the Apollo/Saturn program. They are organized for quick reference. Computer terms are defined in a glossary. Glossy prints of photographs and illustrations are available from IBM information offices listed on the following page. Please order by photo number. Andrew J. Cella Manager of Information, IBM Federal Systems Division.