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Title Application of GPS in a high precision engineering survey network
Creator/Author Ruland, R. ; Leick, A.
Publication Date1985 Apr 01
OSTI IdentifierOSTI ID: 5754805; DE85010556
Report Number(s)SLAC-PUB-3620;CONF-8504111-1
DOE Contract NumberAC03-76SF00515
Resource TypeConference
Specific TypeTechnical Report
Resource Relation1. international symposium on precise positioning with the global positioning system; 15 Apr 1985; Rockville, MD, USA
Research OrgStanford Linear Accelerator Center, CA (USA); Air Force Geophysics Lab., Hanscom AFB, MA (USA)
Subject430303 -- Particle Accelerators-- Experimental Facilities & Equipment; STANFORD LINEAR COLLIDER-- GEODETIC SURVEYS; ALIGNMENT;DATA PROCESSING;EXPERIMENTAL DATA;SATELLITES
Related SubjectACCELERATOR FACILITIES;ACCELERATORS;DATA;GEOPHYSICAL SURVEYS;INFORMATION;LINEAR ACCELERATORS;NUMERICAL DATA;PROCESSING;SURVEYS
Description/Abstract A GPS satellite survey was carried out with the Macrometer to support construction at the Stanford Linear Accelerator Center (SLAC).^The network consists of 16 stations of which 9 stations were part of the Macrometer network.^The horizontal and vertical accuracy of the GPS survey is estimated to be 1 to 2 mm and 2 to 3 mm respectively.^The horizontal accuracy of the terrestrial survey, consisting of angles and distances, equals that of the GPS survey only in the ``loop`` portion of the network.^All stations are part of a precise level network.^The ellipsoidal heights obtained from the GPS survey and the orthometric heights of the level network are used to compute geoid undulations.^A geoid profile along the linac was computed by the National Geodetic Survey in 1963.^This profile agreed with the observed geoid within the standard deviation of the GPS survey.^Angles and distances were adjusted together (TERRA), and all terrestrial observations were combined with the GPS vector observations in a combination adjustment (COMB).^A comparison of COMB and TERRA revealed systematic errors in the terrestrial solution.^A scale factor of 1.5 ppM +- .8 ppM was estimated.^This value is of the same magnitude as the over-all horizontal accuracy of both networks.^10 refs., 3 figs., 5 tabs.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 11
AvailabilityNTIS, PC A02/MF A01.
System Entry Date2001 May 13

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