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A Study on Shipborne Gravity Data Correction Using Kalman RTS Filter  

Hwang, Jong-Sun (Marine geophysical exploration center, petroleum & marine resources Division, Korea Institute of Geoscience and Mineral resources)
Han, Hyun-Chul (Marine geophysical exploration center, petroleum & marine resources Division, Korea Institute of Geoscience and Mineral resources)
Publication Information
Economic and Environmental Geology / v.43, no.4, 2010 , pp. 343-348 More about this Journal
Abstract
Gravity anomalies observed in shipborne survey are usually distorted by bad weather conditions and unexpected vessel movement. These distorted data should be removed because they may mislead the data interpretation. However, it is not possible to perfectly remove all erroneous data. Cross-over point correction, which is generally used, only reduces the errors at cross-over points, and thus the data still contain error values. To resolve this drawback, Rauch-Tung-Striebel(RTS) filter was adopted to minimize all errors in the data and at cross-over points. After applying this method, the range of anomaly variation is reduced from 15 mGal to less than 2 mGal, and errors at the cross-over points are minimized from 4.21 mGal to 2.95 mGal. The results imply that RTS filter is very useful to reduce errors in the data and corss-over points.
Keywords
Kalman filter; Rauch-Tung-Striebel; shipborne gravity anomaly;
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