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Type: Journal article
Title: Airborne gravimetry? a new gravimeter system and test results
Author: Joseph, E. John
Segawa, J.
Kusumoto, S.
Nakayama, E.
Ishihara, Takemi
Komazawa, M.
Sakuma, S.
Citation: Exploration Geophysics, 2003; 34 (1):82-86
Publisher: Australian Society of Exploration Geophysicists
Issue Date: 2003
ISSN: 0812-3985
Statement of
E. John Joseph, Jiro Segawa, Shigekazu Kusumoto, Eiji Nakayama, Takemi Ishihara, Masao Komazawa, Sadomi Sakuma
Abstract: Success 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.
Description: © ASEG 2003
RMID: 0020031478
DOI: 10.1071/EG03082
Appears in Collections:Earth and Environmental Sciences publications

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