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Proceedings Paper

Digital servo implementation: closing loops over VME bus with commercial off-the-shelf processors
Author(s): Kevin J. Ames
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Paper Abstract

Real-time control of gimbaled sensors has been successfully demonstrated using dedicated specialized analog hardware. The reuse of this hardware or its adaptation to new requirements has been limited. To provide more flexibility and allow greater reuse of servo hardware and software, Hughes has developed a commercial off-the-shelf, digitally- based architecture for controlling, measuring and reporting the gimbaled line-of-sight. Applications with multiple servo loops can be performed using real-time hosts and high speed digital signal processors communicating over the VME bus. In this paper we discuss one application of this architecture for a two-axis integrated electro-optical/infrared sensor imbedded in a system with 12 servo loops. The system requirements for gimbal control and line-of-sight reporting required moderately high bandwidth servo loops. Even so, the design incorporated a standard VME bus. Multiple processors with differing interrupt rates were used to control the differing bandwidth servo loops. The requirements, implementation, and performance of this architecture are covered.

Paper Details

Date Published: 23 June 1997
PDF: 7 pages
Proc. SPIE 3086, Acquisition, Tracking, and Pointing XI, (23 June 1997); doi: 10.1117/12.277208
Show Author Affiliations
Kevin J. Ames, Hughes Aircraft Co. (United States)

Published in SPIE Proceedings Vol. 3086:
Acquisition, Tracking, and Pointing XI
Michael K. Masten; Larry A. Stockum, Editor(s)

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