Title: Further Critical Perspectives on Certain Aspects of GPS Development and Use
Author(s): Thomas H. Kerr III
Published in: Proceedings of the 57th Annual Meeting of The Institute of Navigation
June 11 - 13, 2001
Albuquerque, NM
Pages: 592 - 608
Cite this article: III, Thomas H. Kerr, "Further Critical Perspectives on Certain Aspects of GPS Development and Use," Proceedings of the 57th Annual Meeting of The Institute of Navigation, Albuquerque, NM, June 2001, pp. 592-608.
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Abstract: We seek to clarify a few problems associated with GPS use in order to propel their resolution by clearly elu- cidating the nature of these problems. We express our concerns about (1) certain aspects of prescribed GPS availability augmentation that currently calls for heavy supplemental reliance on (apparently risky) baro- altimeters, (2) the difficulty of ameliorating multipath effects in many civilian applications, (3) GPS's sus- ceptibility to foliage attenuation as an L-band signal, (4) some evolving policy issues relating to agricultural use (and implied development support) of GPS, (5) Re- ceiver Aided Integrity Monitoring (RAJM) validation (specifically its lack of official confirmation), and (6) anticipated obscuring cross effects of (RAIM) [a vari- ant of Failure Detection in dynamical systems] with heavy (as contrasted with light or medium) integra- tion with an INS as is otherwise recommended for use to achieve the greatest NAV accuracy. These topics, while controversial, cut across almost all applications and so elucidation should be viewed as a positive step forward.