FIRST EXPERIENCE OF THE GABL-PM ABSOLUTE LASER BALLISTIC GRAVIMETER INSTALLED ABOARD AN ICE-RESISTANT PLATFORM WITHOUT GYROSTABILIZATION
D.A. Nosov1, D.K. Dronov2, Yu.G. Turbin2, I.S. Sizikov1
1Institute of Automation and Electrometry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
2Arctic and Antarctic Research Institute, St. Petersburg, Russia
Keywords: Absolute gravimeter, ice-resistant platform (IRP), gravity acceleration, relative gravimeter, gyrostabilized platform, North Pole-42 expedition
Abstract
We present our first experimental work with the GABL-PM absolute ballistic laser gravimeter on a pier, in ports and on board of an ice-resistant platform (IRP) in the expedition North Pole-42 (NP-42). During the tests, we parametrically adjusted the gravimeter to adapt it for the operation on the IRP without using a gyrostabilized platform. The results of the GABL-PM measurements on the pier in St. Petersburg are shown; they are required as reference to test the gravimeter on the vessel, as well as to tie variations in gravity acceleration measured on board of the IRP using the Chekan-AM relative gravimeter to absolute values. The estimation of the root-mean-square (RMS) error of the GAB-PM measurement on board of the IRP at various pitching parameters in the ports of St. Petersburg and Murmansk, as well as in the early days of the start of the drift of the North Pole-42 expedition, is given. Based on the measurement results, we conclude that a gravimeter without a gyrostabilized platform with reduced accuracy values, on average up to 0.60 mGal, can be used for measurements after freezing the vessel in ice and when all the requirements of a specially developed manual are met.
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