NAVIGATION FOR PRECISION APPROACHES : ROBUST INTEGRITY MONITORING USING GPS + GALILEO

This article presents a discussion of an alternative integrity monitoring technique for GPS navigation systems that does not rely on overbounding errors with a protection limit to safely account for the occasional larger than normal errors. The proposed system needs no assumption on the error distribution, using a technique that marries GPS with Galileo. Describes an algorithm developed for this method. Its elements include a method to select satellite subsets with good geometries, a metric to describe the scatter of position estimates, and a rule to determine the error bound or protection level based on the size of scatter. An illustration uses a simple Galileo-like implementation corresponding to 42 satellites arranged as a Walker 42/7/1 constellation. A hypothetical problem is developed, with the basic computational steps. Includes graphs and scatter plots. The approach is found to require richly redundant measurement steps typical of constellations of 40-plus satellites. But to prove the algorithm meets the false alarm and missed detection requirements will require additional simulations with a more representative satellite array.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/10485104
• Supplemental Notes:
  • Page range: pp 16-18, 20-21
• Corporate Authors:

  Advanstar Communications, Incorporated

  131 West First Street
  Duluth, MN  United States  55802-2065
• Authors:
  • Misra, P
  • Bednarz, S
• Publication Date: 2004-4

Language

• English

Media Info

• Features: Figures;
• Pagination: p. 42-49
• Serial:
  • GPS World
  • Volume: 15
  • Issue Number: 4
  • Publisher: Advanstar Communications, Incorporated
  • ISSN: 1048-5104

Subject/Index Terms

• TRT Terms: Aircraft guidance systems; Algorithms; Global Positioning System; Precision; Redundancy
• Subject Areas: Aviation; Design;

Filing Info

• Accession Number: 00974317
• Record Type: Publication
• Source Agency: UC Berkeley Transportation Library
• Files: BTRIS, TRIS
• Created Date: Jun 2 2004 12:00AM