Accession Number : AD0632353

Title :   AN ESTIMATE OF THE UNCERTAINTY IN THE ADOPTED VALUE OF GRAVITY AT ABSOLUTE STATIONS.

Descriptive Note : Rept. for Oct 65-Mar 66,

Corporate Author : AEROSPACE CORP SAN BERNARDINO CALIF

Personal Author(s) : Reams,G. A. ; Gregory,A. J.

Report Date : MAR 1966

Pagination or Media Count : 36

Abstract : A determination of the uncertainty in the magnitude of gravity assigned to various absolute stations is presented in this report. Accurate estimates of these uncertainties are essential in design and guidance accuracy studies for ballistic weapon systems. A review of the literature on absolute and relative gravity measurements has been performed. The findings of this review indicate that at present there is some doubt about the value of gravity to adopt for each of the absolute stations and a corresponding doubt concerning the uncertainty. Using published gravity data, various adjustments have been studied. The computational procedure used consists of a simultaneous determination of the value of gravity at each absolute station through a least-squares adjustment of the absolute and relative gravity observations. This procedure yields an adjusted value of gravity and an estimate of the uncertainty at each station. Estimates of uncertainty are computed assuming that the errors in the data are random and also assuming that part of the error is systematic. (Author)

Descriptors :   (*GRAVITY, MEASUREMENT), UNCERTAINTY, LEAST SQUARES METHOD, WEAPON SYSTEMS, BALLISTICS, GUIDANCE

Subject Categories : Geodesy
      Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE