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Proceedings Paper

High Resolution Position And Velocity Measurement With Incremental Encoders
Author(s): U. Beckmann; R. Bardenheuer
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Paper Abstract

The use of optical telescopes for infrared and radioastronomy, where observations can also be made in daytime, requires reproducible positioning. Exceptionally good tracking is demanded particularly for radioastronomy, when the observation range extends to the millimeter- and submillimeter wavelengths. For radio telescopes with a small antenna beamwidth (below 1 arcmin) position errors should not exceed a few arcsec. This accuracy can only be achieved when the antenna position (angle) and velocity as well as the motor position and velocity are measured. The measurement of magnitudes in the arcsec region can be done with commercially available incremental encoders. For these encoders electronic circuits have been developed to guarantee the required resolution. The design of the electronic circuits also provide possibilities to correct encoder errors and interface to the host computer. The installation of the measurement electronics at the 30 meter MRT is finished, and tests have been started. These show that the required accuracy can be achieved.

Paper Details

Date Published: 3 November 1983
PDF: 5 pages
Proc. SPIE 0444, Advanced Technology Optical Telescopes II, (3 November 1983); doi: 10.1117/12.937968
Show Author Affiliations
U. Beckmann, Max-Planck-Institut fur Radioastronomie (Germany)
R. Bardenheuer, Institut de Radio Astronomie Millimetrique (Spain)

Published in SPIE Proceedings Vol. 0444:
Advanced Technology Optical Telescopes II
Lawrence D. Barr; Brian Mack, Editor(s)

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