Analog Studies of the Limit-cycle Fuel Consumption of a Spinning Symmetric Drag-free Satellite
Analog simulation of limit-cycle fuel consumption of spinning symmetric drag-free satellite
ANALOG SIMULATION↗
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Attitude-translation coupling in drag-free satellites
Attitude-translation motion coupling effect on stability of gravity-stabilized drag-free satellites
Crespo Da Silva, M.↗
Propulsion requirements for drag-free satellites
Drag-free satellite design and propulsion requirements, noting orbit perturbation mechanisms
Debra, D. B.↗
Propulsion requirements for drag-free satellites
Drag-free satellite design and propulsion requirements, noting orbit perturbation mechanisms
Debra, D. B.↗
On the accuracy of the relativistic parameters beta, gamma, and the solar oblateness coefficient J2, as deduced from ranging data of a drag-free space probe
Motion in the general gravity field is described mathematically. A covariance analysis, based on two simple models, is presented. Two drag-free space probes were considered, for which the orbital elements are given.
Roth, E. A.↗
A preliminary design of a drag-free satellite and its application to geodesy
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.
Lange, B. O.↗
On the engineering portion of a research program to develop a zero-g, drag-free satellite and to perform a gyro test of general relativity in a satellite Fourth semiannual status report
Zero gravity satellite concept feasibility and control system design evaluation using air cushion vehicle
SATELLITE CONTROL↗
Develop a zero-G drag-free satellite and perform a gyro test of general relativity in a satellite Semiannual status report, Nov. 1965 - Apr. 1966
Aeronomy experiment satellite polar orbit, control analysis, and control simulation
Cannon, R. H., Jr.↗
Control of a spinning drag-free satellite to reduce trajectory errors due to mass attraction
Control analysis of spinning drag free satellite controller to reduce trajectory errors from mass attraction
Jhin, P.↗
Physical limitations in sensors for a deep space drag-free probe
Drag free spacecraft performance in deep space, examining inner residual disturbance forces for motion control systems
Juillerat, R.↗
Mass center estimation in spinning drag-free satellites
Analog mass center estimator for spinning drag- free orbiting satellite, using free-falling proof mass shielded from external forces inside satellite cavity as reference
Powell, J. D.↗
A study to prepare a preliminary analysis and design definition of a drag-free satellite for geodynamics
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Lange, B. O.↗
Estimation in satellite control.
The use of estimators or observers is discussed as applied to satellite attitude control and the control of drag-free satellites. The practical problems of implementation are discussed, and the relative advantages of full and reduced state estimators are compared, particularly in terms of their effectiveness and bandwidth as filters. Three applications are used to illustrate the principles. They are: (1) a reaction wheel control system, (2) a spinning attitude control system, and (3) a drag-free satellite translational control system. Fixed estimator gains are shown to be adequate for these (and many other) applications. Our experience in the hardware realization of estimators has led to categorize the error sources in terms of those that improve with increased estimator gains and those that get worse with increased estimator gains.
Debra, D. B.↗
An accuracy and speed comparison of the Vinti and Brouwer orbit prediction methods
Accuracy and speed comparison between drag-free and numerical satellite orbit prediction methods
Bonavito, N. L.↗
A comparison of satellite drag measurement techniques.
Drag measuring requirements and comparison of accelerometer or drag-free satellite control systems usage for atmospheric density determination
Debra, D. B.↗
Determination of mean orbital elements from initial conditions for a Vinti ballistic trajectory
Mean orbital elements for Vinti spheroidal theory of drag-free satellite motion applied to ballistic trajectories
Walden, H.↗
Determination of mean orbital elements from initial conditions for a Vinti ballistic trajectory
Mean orbital element determination using Vintis spheroidal theory of drag-free satellite motion applied to ballistic trajectories
Walden, H.↗
ESRO study program for a space experiment on gravitation theories
ESRO is considering a space experiment which is the definition phase. A more complete utilization of space techniques, leading to highly accurate acceleration measurements in a heliocentric spacecraft, together with an improved laser signal propagation method (using a space-borne atomic clock), could substantially increase the validity of the gravitational time delay test during solar conjunction. Preliminary investigations of the primary required techniques were carried out. These studies included an orbit analysis, investigation of drag-free techniques, and studies of the time measuring instrument. These studies were used to define the framework of a space experiment on gravitation theories. A preliminary feasibility study of the mission is being undertaken.
Israel, G. M.↗