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Proceedings Paper

Wideband precision two-axis beam steerer tracking servo design and test results
Author(s): William L. Hayden; T. McCullough; A. Reth; David M. Kaufman
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Paper Abstract

A compact, light-weight, two-axis beam steerer (TABS) with a 38 mm (1.5') Beryllium clear aperture was designed into a 1000 Hz servo loop for precision tracking of a remote laser source. The design is composed of a quadrant photodiode, a track-tone demodulator, a linear ratiometric processor with sum and difference circuits, and a proportional/integral controller with a phase lead compensator. The demodulator is a phase-lock-loop used for locking onto and then synchronously detecting the envelope of a modulated tracking beacon. This approach provides background rejection, star discrimination (or any other CW source), receiver AC coupling, and 1/f noise reduction. The linear ratiometric processor provides x and y error signals to the controller which are independent of input signal levels. The far-field performance goal is < 0.5 microradians rms from a Landsat-type of base motion disturbance.

Paper Details

Date Published: 6 August 1993
PDF: 9 pages
Proc. SPIE 1866, Free-Space Laser Communication Technologies V, (6 August 1993); doi: 10.1117/12.149244
Show Author Affiliations
William L. Hayden, NASA Goddard Space Flight Ctr. (United States)
T. McCullough, NASA Goddard Space Flight Ctr. (United States)
A. Reth, NASA Goddard Space Flight Ctr. (United States)
David M. Kaufman, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 1866:
Free-Space Laser Communication Technologies V
G. Stephen Mecherle, Editor(s)

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