Wideband precision two-axis beam steerer tracking servo design and test results

William L. Hayden; T. McCullough; A. Reth; David M. Kaufman

doi:10.1117/12.149244

6 August 1993 Wideband precision two-axis beam steerer tracking servo design and test results

William L. Hayden, T. McCullough, A. Reth, David M. Kaufman

Proceedings Volume 1866, Free-Space Laser Communication Technologies V; (1993) https://doi.org/10.1117/12.149244
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

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.

Citation Download Citation

William L. Hayden, T. McCullough, A. Reth, and David M. Kaufman "Wideband precision two-axis beam steerer tracking servo design and test results", Proc. SPIE 1866, Free-Space Laser Communication Technologies V, (6 August 1993); https://doi.org/10.1117/12.149244

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