"A Comparison of an MIT Explicit Guidance Principle with MSFC Iterative Guidance."
subject: George C. Marshall Space Flight Center
subject: Massachusetts Institute of Technology
subject: Inertial guidance
subject: Spacecraft guidance
subject: Space flight
description: From the summary: "Both [guidance] schemes steer toward a specified end point. The MIT scheme uses thrust to cancel out the effective gravity, a nonlinear term, which may be inefficient in certain cases. The MSFC scheme is more closely connected with calculus of variations and optimization theory in a reasonable degree of approximation."
creator: Hart, Judson J.
source: Helmut Horn Collection
source: Box 1, Folder 2
source: University of Alabama in Huntsville Archives, Special Collections, and Digital Initiatives, Huntsville, Alabama
date: 1964-09-30
rights: This material may be protected under U. S. Copyright Law (Title 17, U.S. Code) which governs the making of photocopies or reproductions of copyrighted materials. You may use the digitized material for private study, scholarship, or research. Though the University of Alabama in Huntsville Archives and Special Collections has physical ownership of the material in its collections, in some cases we may not own the copyright to the material. It is the patron's obligation to determine and satisfy copyright restrictions when publishing or otherwise distributing materials found in our collections.
relation: spc_horn_2020_04
language: en
type: Reports
type: Text

"General Formulation of the Iterative Guidance Mode."
subject: George C. Marshall Space Flight Center
subject: Inertial guidance
subject: Spacecraft guidance
subject: Space flight
description: From the abstract: "This report discusses the iterative guidance mode and its application to three-dimensional upper stage vacuum flight. It is an inertial or closed system mode in that the only inputs required after liftoff are available from the onboard navigation system. That is, the iterative scheme computes steering commands as a function of the state and of the vehicle - velocity, position, longitudinal acceleration, and gravitational acceleration - and the desired cutoff conditions. The guidance commands are updated each guidance cycle, using the updated state of the vehicle. The iterative guidance scheme is a path adaptive guidance scheme in that it will retain its optimization properties under all expected types and magnitudes of vehicle perturbations without any loss in accuracy at liftoff."
creator: Smith, Isaac E.
source: Helmut Horn Collection
source: Box 1, Folder 59
source: University of Alabama in Huntsville Archives and Special Collections
date: 1966-03-22
rights: This material may be protected under U. S. Copyright Law (Title 17, U.S. Code) which governs the making of photocopies or reproductions of copyrighted materials. You may use the digitized material for private study, scholarship, or research. Though the University of Alabama in Huntsville Archives and Special Collections has physical ownership of the material in its collections, in some cases we may not own the copyright to the material. It is the patron's obligation to determine and satisfy copyright restrictions when publishing or otherwise distributing materials found in our collections.
relation: spc_horn_2020_04
language: en
type: Reports
type: Text

Draft of "Concepts of the Iterative Guidance Law for Saturn Launch Vehicles."
subject: Saturn launch vehicles
subject: Saturn Project (U.S.)
subject: Spacecraft guidance
subject: Space flight
description: The summary notes, "In 1960, research work was begun to develop new guidance concepts for the Saturn space vehicles. [...] This paper presents the basics of the Iterative Guidance Law developed for Saturn launch vehicles to meet these new requirements of space age guidance. The development of the Iterative Guidance Law and the results and ideas presented in this paper are due primarily to Mr. Helmut J. Horn and his associates in the Dynamics Analysis and Flight Mechanics Division of the Aero-Astrodynamics Laboratory." Marked "Research Review, OK" in the upper right corner of the first page. The document includes corrections and additions to the text in red pencil.
source: Helmut Horn Collection
source: Box 1, Folder 60
source: University of Alabama in Huntsville Archives and Special Collections
rights: This material may be protected under U. S. Copyright Law (Title 17, U.S. Code) which governs the making of photocopies or reproductions of copyrighted materials. You may use the digitized material for private study, scholarship, or research. Though the University of Alabama in Huntsville Archives and Special Collections has physical ownership of the material in its collections, in some cases we may not own the copyright to the material. It is the patron's obligation to determine and satisfy copyright restrictions when publishing or otherwise distributing materials found in our collections.
relation: spc_horn_2020_04
language: en
type: Reports
type: Text

Summary of the Iterative Guidance Mode.
subject: Inertial guidance
subject: Spacecraft guidance
subject: Space flight
source: Helmut Horn Collection
source: Box 1, Folder 64
source: University of Alabama in Huntsville Archives and Special Collections
rights: This material may be protected under U. S. Copyright Law (Title 17, U.S. Code) which governs the making of photocopies or reproductions of copyrighted materials. You may use the digitized material for private study, scholarship, or research. Though the University of Alabama in Huntsville Archives and Special Collections has physical ownership of the material in its collections, in some cases we may not own the copyright to the material. It is the patron's obligation to determine and satisfy copyright restrictions when publishing or otherwise distributing materials found in our collections.
relation: spc_horn_2020_04
language: en
type: Reports
type: Text