title: A Feasibility Analysis of Land-Based SINS/GNSS Gravimetry for Groundwater Resource Detection in Taiwan.
abstract: The integration of the Strapdown Inertial Navigation System and Global Navigation Satellite System (SINS/GNSS) has been implemented for land-based gravimetry and has been proven to perform well in estimating gravity. Based on the mGal-level gravimetry results, this research aims to construct and develop a land-based SINS/GNSS gravimetry device containing a navigation-grade Inertial Measurement Unit. This research also presents a feasibility analysis for groundwater resource detection. A preliminary comparison of the kinematic velocities and accelerations using multi-combination of GNSS data including Global Positioning System, Global Navigation Satellite System, and BeiDou Navigation Satellite System, indicates that three-system observations performed better than two-system data in the computation. A comparison of gravity derived from SINS/GNSS and measured using a relative gravimeter also shows that both agree reasonably well with a mean difference of 2.30 mGal. The mean difference between repeat measurements of gravity disturbance using SINS/GNSS is 2.46 mGal with a standard deviation of 1.32 mGal. The gravity variation because of the groundwater at Pingtung Plain, Taiwan could reach 2.72 mGal. Hence, the developed land-based SINS/GNSS gravimetry can sufficiently and effectively detect groundwater resources.
authors.affiliation: Department of Geomatics, National Cheng Kung University, No. 1, University Road, Tainan 701, Taiwan. kwchiang@mail.ncku.edu.tw.
authors.forename: Kai-Wei
authors.initials: KW
authors.lastname: Chiang
authors.affiliation: Department of Geomatics, National Cheng Kung University, No. 1, University Road, Tainan 701, Taiwan. p68011068@mail.ncku.edu.tw.
authors.forename: Cheng-An
authors.initials: CA
authors.lastname: Lin
authors.affiliation: Department of Geomatics, National Cheng Kung University, No. 1, University Road, Tainan 701, Taiwan. kuo70@mail.ncku.edu.tw.
authors.forename: Chung-Yen
authors.initials: CY
authors.lastname: Kuo
keywords: gravity disturbance; groundwater  resource detection; land-based SINS/GNSS gravimetry