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The use of differencing to eliminate environmental effects in the intercomparison of absolute gravity meters
Author(s) -
Robertson Douglas,
Sasagawa Glenn,
Klopping Fred,
Bilham Roger
Publication year - 1996
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl00014
Subject(s) - environmental science , geodesy , metre , noise (video) , meteorology , remote sensing , geology , physics , computer science , astronomy , artificial intelligence , image (mathematics)
Conventional intercomparisons between absolute gravity meters are limited in accuracy by the difficulty of removing environmental signals, including effects such as Earth tides, ocean loading, and barometric pressure loading. These error sources can be eliminated completely through the use of exactly simultaneous measurements. Differencing techniques have been developed and tested which are capable of determining both the differential meter bias and the gravity difference between two nearby piers to an accuracy that is limited only by the instrumental noise. Preliminary tests show that a comparison accuracy of 0.3 µgal may be obtained in less than 400 drops, independent of drop interval (1 µgal = 10 nanometer/sec²).