Other
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jansc..39..283d&link_type=abstract
Journal of the Astronautical Sciences (ISSN 0021-9142), vol. 39, July-Sept. 1991, p. 283-297.
Other
1
Orbital Mechanics, Spacecraft Motion, Stationkeeping, Very Long Base Interferometry, Celestial Geodesy, Gravity Gradient Satellites, Satellite Tracking, Thrust Programming
Scientific paper
This paper presents a three-satellite station-keeping strategy that is applicable to very long (1-100 km) baseline optical interferometry in space using the 'free-flyer' approach. The relative positions of the satellites in an arbitrarily oriented inertial coordinate system are described parametrically, and the continuous thrust vectors required to follow the paths are derived. The paths, which are constrained to be in the U-V plane of an astronomical source (a plane perpendicular to the direction of the source), are always chosen to maximize the use of gravity gradient forces and minimize the use of thrusting which can easily be provided by ion thrusters. Two different thrust programs are presented. One allows the interferometer to take data over an elliptic-shaped area of the U-V plane of arbitrary size for astronomical sources in any direction except close to the orbit plane of the system. The second thrust program reorients the U-V plane from one arbitrary source direction to another.
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