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Track level compensation look-up table improves antenna pointing precision

Show simple item record Gawronski, Wodek K. Baher, Farrokh Gama, Eric 2009-04-08T18:22:31Z 2009-04-08T18:22:31Z 2006-05-24
dc.identifier.citation Optomechanical Technologies for Astronomy, May 24-31 2006, en_US
dc.identifier.clearanceno 06-0836
dc.description.abstract The pointing accuracy of the NASA Deep Space Network antennas is significantly impacted by the unevenness of the antenna azimuth track. The track unevenness causes repeatable antenna rotations, and repeatable pointing errors. The paper presents the improvement of the pointing accuracy of the antennas by implementing the track-level-compensation look-up table. The table consists of three axis rotations of the alidade as a function of the azimuth position. The paper presents the development of the table, based on the measurements of the inclinometer tilts, processing the measurement data, and determination of the three-axis alidade rotations from the tilt data. It also presents the determination of the elevation and cross-elevation errors of the antenna as a function of the alidade rotations. The pointing accuracy of the antenna with and without a table was measured using various radio beam pointing techniques. The pointing error decreased when the table was used, from 1.5 mdeg to 1.2 mdeg in elevation, and from 20.4 mdeg to 2.2 mdeg in cross-elevation. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher International Society for Optical Engineering, en_US
dc.subject microwave antennas en_US
dc.subject precision engineering en_US
dc.subject error analysis en_US
dc.subject rotation en_US
dc.title Track level compensation look-up table improves antenna pointing precision en_US
dc.type Article en_US

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