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      <marc:subfield code="a">Ryerson, Robert A.</marc:subfield>
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      <marc:subfield code="a">Global navigation satellite system augmentation models environmental scan </marc:subfield>
      <marc:subfield code="h">[electronic resource] / </marc:subfield>
      <marc:subfield code="c">prepared by Robert A. Ryerson ; with input by Douglas W. Bancroft and Sunil Bisnath.</marc:subfield>
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      <marc:subfield code="a">"March 31, 2015.”</marc:subfield>
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      <marc:subfield code="a">Includes bibliographical references.</marc:subfield>
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      <marc:subfield code="a">This study provides a high level environmental scan to investigate the role Government and industry play, in terms of collaboration and investment, in supporting the implementation of Global Navigation Satellite System (GNSS) augmentation systems. Augmentation systems improve the accuracy, reliability, and integrity (or availability) of position information through the integration of external information into the calculation process. The study is focused strictly on the civilian sector: military applications are specifically excluded.</marc:subfield>
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      <marc:subfield code="a">Bancroft, Douglas W.</marc:subfield>
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