Accession Number : ADA271324


Title :   Absolute Positioning by Collecting Global Positioning System (GPS) Data Along Short Baselines


Descriptive Note : Final rept.,


Corporate Author : NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA


Personal Author(s) : Hermann, Bruce R. ; Evans, Alan G.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA271324


Report Date : SEP 1993


Pagination or Media Count : 38


Abstract : This report addresses the problem of determining absolute positions (longitude and latitude) from Global Positioning System (GPS) data in the presence of Selective Availability (SA). The SA-epsilon effect can be avoided if one can wait until corrected or post-fitted satellite ephemerides and clock estimates become available. However, the SA-dither effect cannot easily be eliminated from the ranging data in the field. This report considers both problems and suggests methods that have the potential to allow absolute position solutions to be obtained even with dither corrupting the satellite data. The requirements and practicality of each are reviewed. Selective availability (SA), Antispoofing (AS), Absolute positioning, Global positioning system (GPS).


Descriptors :   *GLOBAL POSITIONING SYSTEM , *ARTIFICIAL SATELLITES , DATA BASES , REQUIREMENTS , GLOBAL , LONGITUDE , EPHEMERIDES , LATITUDE , CLOCKS , ESTIMATES , AVAILABILITY


Subject Categories : UNMANNED SPACECRAFT


Distribution Statement : APPROVED FOR PUBLIC RELEASE