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  • 1
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    A preliminary design of a drag-free satellite and its application to geodesy (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The design of a drag-free satellite and its application to measuring tidal interaction of the earth and tesseral harmonics are discussed. Principle areas of discussion are: (1) the feasibility of making geophysical measurements which are not possible with conventional satellites, and (2) design of attitude and translation control systems for spinning vehicle and possible coupling of attitude and translation control for gravity stabilized vehicles.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-125606
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Propulsion requirements for drag-free satellites (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Drag-free satellite design and propulsion requirements, noting orbit perturbation mechanisms
    Keywords: SPACE VEHICLES
    Type: AIAA PAPER 70-1145
    Format: text
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  • 3
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    Develop minimum thrustor control laws and select orbits for a geodesy drag-free satellite (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The original motivation for studying control laws for pulse plasma systems was based on the improved life characteristics possible with pulse plasma jets. These pulse plasma units are relatively massive compared with cold gas thrustors. As a result, therefore, significant mass savings can be achieved by minimizing the the number of thrustors. The control laws, therefore, were developed for thrust available from two thrustors only. In a spinning satellite, these thrustors are sufficient to completely control the vehicle as long as the spin rate is sufficiently high for a given level of external disturbance. The thrustors are canted so that a component of each is along the plus and minus spin axis. The other component of each thrustor acts in the radial direction. It is sufficient to analyze the behavior in the plane of spin assuming a single thrustor.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-139018
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Attitude-translation coupling in drag-free satellites (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Attitude-translation motion coupling effect on stability of gravity-stabilized drag-free satellites
    Keywords: SPACE VEHICLES
    Type: INTERNATIONAL FEDERATION OF AUTOMATIC CONTROL, 3RD; Mar 02, 1970 - Mar 06, 1970; TOULOUSE; FRANCE
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Precise attitude control of the Stanford relativity satellite. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A satellite being designed by the Stanford University to measure (with extremely high precision) the effect of General Relativity is described. Specifically, the satellite will measure two relativistic precessions predicted by the theory: the geodetic effect (6.9 arcsec/yr), due solely to motion about the earth, and the motional effect (0.05 arcsec/yr), due to rotation of the earth. The gyro design requirements, including the requirement for precise attitude control and a dynamic model for attitude control synthesis, are discussed. Closed loop simulation of the satellite's natural dynamics on an analog computer is described.
    Keywords: SPACE VEHICLES
    Type: Joint Automatic Control Conference; Jun 20, 1973 - Jun 22, 1973; Columbus, OH
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Satellite attitude control simulations (1973)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: Work was conducted to develop an extremely low drift rate gyroscope and a very precise star tracker. A proposed relativity satellite will measure very accurately the theoretically predicted 'relativistic' precession of the gyroscope relative to an inertial reference frame provided by the star tracker. Aspects of precision spinning attitude control are discussed together with questions of gyro operation, and the hopping mode for lunar transportation. For the attitude control system of the lunar hopper, a number of control laws were investigated. The studies indicated that some suboptimal controls should be adequate for the system.
    Keywords: SPACE VEHICLES
    Type: International Seminar on Simulation and Space; Sept. 10-14, 1973; Toulouse; France
    Format: text
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  • 7
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    Propulsion requirements for drag-free satellites (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Drag-free satellite design and propulsion requirements, noting orbit perturbation mechanisms
    Keywords: SPACE VEHICLES
    Type: AIAA PAPER 70-1145 , ; IENCES (|ELECTRIC PROPULSION CONFERENCE; Aug 31, 1970 - Sep 02, 1970; STANFORD, CA
    Format: text
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