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Proceedings Paper

Laboratory Test Results Of The High Speed Optical Tracking System For The Spaceborne Geodynamic Ranging System
Author(s): Thomas W. Zagwodzki; David L. White
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Paper Abstract

Testing of the high speed, high resolution optical tracking system intended for use in the Spaceborne Geodynamic Ranging System (SGRS) has been completed at the Goddard Space Flight Center (GSFC). This two-axis gimbaled pointing system, designed to operate from a Space Shuttle platform, is required to point to, acquire, and then track multiple retro-reflector ground targets with arcsecond accuracy. This application requires accurate tracking, high slew rates, and rapid settling times. Laboratory testing of the stepping characteristics of the pointing system for various step sizes and directions showed, in most cases, arcsecond repeatability with little wasted motion, overshoot, or ringing. Worst case RMS tracking jitter was 1 and 2 arcseconds in the roll and pitch axes respectively at the maximum tracking rate of 2° per second. At tracking rates below .1° per second, the RMS tracking jitter was .1 arcsecond or less in both axes. Tracking offsets of .1 arcseconds in the roll axis and .5 arcseconds in the pitch axis were observed throughout the testing. Servo response to tracking commands were recorded for various tracking rates, step sizes, sine wave commands, and simulated SGRS pass data, and will be presented here.

Paper Details

Date Published: 1 February 1987
PDF: 10 pages
Proc. SPIE 0641, Acquisition, Tracking, and Pointing, (1 February 1987); doi: 10.1117/12.964426
Show Author Affiliations
Thomas W. Zagwodzki, NASA/Goddard Space Flight Center (United States)
David L. White, NASA/Goddard Space Flight Center (United States)

Published in SPIE Proceedings Vol. 0641:
Acquisition, Tracking, and Pointing
Richard R. Auelmann; Herbert L. Richard, Editor(s)

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