A COMPACT ON-LINE DATA PROCESSING SYSTEM FOR THE TOKYO SURFACE SHIP GRAVITY METER

Abstract

As the first step of developing a compact surface ship gravity meter, a compact gravity data processing system on-Iine with a Tokyo Surface Ship Gravity Meter (T.S.S.G.) was newly designed and tested at sea. This system was made compact by using a single board computer for gravity computations, a handhold personal computer for data recording, and a Loran C receiver for navigation. Free-air anomalies are obtained by this on-line processing. Over-all accuracy of this data processing is estimated to be 2-3 mgal; if the error from the Eötvös correction is not considered, the accuracy is estimated to be 0.1 mgal. The data processing system was successfully tested on board a research vessel and used for the gravity measurements around Japan in the case of the Japan-France Cooperative Project "KAIKO."