Airborne gravimetry? a new gravimeter system and test results

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dc.contributor.authorJoseph, E. Johnen
dc.contributor.authorSegawa, J.en
dc.contributor.authorKusumoto, S.en
dc.contributor.authorNakayama, E.en
dc.contributor.authorIshihara, Takemien
dc.contributor.authorKomazawa, M.en
dc.contributor.authorSakuma, S.en
dc.date.issued2003en
dc.description© ASEG 2003en
dc.description.abstractSuccess of airborne gravity surveys mainly depends on determining the three-dimensional (3D) position of the moving platform. Recent advances in technology, especially the Global Positioning System (GPS), have made it possible to determine the velocity and position of the moving platform more frequently and with greater accuracy. Taking advantage of these advances in GPS technology, and using a newly developed system, helicopter-borne gravity measurements were successfully carried out over the Kanto and Tokai districts of Japan. This new gravimeter system is composed of servo accelerometer sensors, a stabilised platform, an optical-fibre gyroscope to control the stabilised platform, GPS receivers, and a data processor. The 3D position of the helicopter at every second was accurately determined by the interferometric GPS method. These GPS data were also used to compute various correction factors which are applied to the measured gravity acceleration. Real-time differential GPS positioning was also conducted using a separate receiver mounted on the helicopter. These real-time positioning data were used for controlling the optical-fibre gyroscope. The gravity acceleration data were processed and all necessary corrections were applied. Numerical filtering was carried out to remove high-frequency noise in the data. The observed free-air gravity anomalies were then compared with upward continuation of the ground gravity data to the flight altitude. We also compiled an airborne gravity anomaly map from the airborne data, which was compared with upward-continued ground gravity data.en
dc.description.statementofresponsibilityE. John Joseph, Jiro Segawa, Shigekazu Kusumoto, Eiji Nakayama, Takemi Ishihara, Masao Komazawa, Sadomi Sakumaen
dc.identifier.citationExploration Geophysics, 2003; 34 (1):82-86en
dc.identifier.doi10.1071/EG03082en
dc.identifier.issn0812-3985en
dc.identifier.urihttp://hdl.handle.net/2440/1771
dc.language.isoenen
dc.publisherAustralian Society of Exploration Geophysicistsen
dc.titleAirborne gravimetry? a new gravimeter system and test resultsen
dc.typeJournal articleen

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