Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981opten..20..621s&link_type=abstract
Opt. Eng., Vol. 20, p. 621 - 624
Astronomy and Astrophysics
Astronomy
1
Infrared Astronomy, Infrared Interferometers, Laser Interferometry, Optical Heterodyning, Satellite-Borne Instruments, Continuous Wave Lasers, Data Recording, Geosynchronous Orbits, Infrared Lasers, Polar Orbits, Timing Devices
Scientific paper
A satellite interferometer system utilizing 10 micron laser heterodyne systems has been investigated. In its simplest form, the system consists of a pair of satellites, one in a polar orbit and the other in a synchronous orbit. The spatial frequencies covered in a twelve hour observing period extend upward from the inverse of the earth's diameter, corresponding to a resolution of 10 to the -12th radians. Absolute phase, corresponding to the constantly changing baseline between the two satellites, is measured by a simultaneous heterodyning of a calibration laser traversing the distance between the two satellites. The orientation of the baselines is recorded from timing and sequencing the data, with corrections for time dilation and other perturbations.
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