Airborne Gravity Field Determination

Forsberg, René; Olesen, Arne Vestergaard

doi:10.1007/978-3-642-11741-1_3

Cited by 51 publications

(24 citation statements)

References 12 publications

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“…noise of 8 mGal. We believe that the bias is primarily due to the small size of the survey area, as airborne gravity is usually biased by less than 1 mGal (Forsberg and Olesen, 2010). The airborne gravity data agrees with the GOCE data with ~14 mGal r.m.s.…”

Section: Resultssupporting

confidence: 69%

Upward continuation of Dome-C airborne gravity and comparison with GOCE gradients at orbit altitude in east Antarctica

et al. 2016

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An airborne gravity campaign was carried out at the Dome-C survey area in East Antarctica between the 17th and 22nd of January 2013, in order to provide data for an experiment to validate GOCE satellite gravity gradients. After typical filtering for airborne gravity data, the cross-over error statistics for the few crossing points are 11.3 mGal r.m.s., corresponding to an r.m.s. line error of 8.0 mGal. This number is relatively large due to the rough flight conditions, short lines and field handling procedures used. Comparison of the airborne gravity data with GOCE RL4 spherical harmonic models, confirmed the quality of the airborne data and that they contain more high frequency signal than the global models. First, the airborne gravity data were upward continued to GOCE altitude to predict gravity gradients in the local North-East-Up reference frame applying least squares collocation using the ITG-GRACE2010S field to degree and order 90 as reference field, which is subtracted from both the airborne gravity and GOCE gravity gradients. Then, the predicted gradients are rotated to the gradiometer reference frame using level 1 attitude quaternion * The manuscript solely reflects the personal views of the author and does not necessarily represent the views, positions, strategies or opinions of Turkish Armed Forces.

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Section: Resultssupporting

confidence: 69%

Upward continuation of Dome-C airborne gravity and comparison with GOCE gradients at orbit altitude in east Antarctica

et al. 2016

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“…Scalar gravimeters have been widely used for airborne gravimetry surveys and have been shown to provide accuracies better than 2 mGal for spatial resolutions down to 2 km (halfwavelength) (Bruton 2000;Forsberg and Olesen 2010;Li 2013). However, besides being expensive, these systems are not easy to install in a small aircraft due to their large dimensions.…”

Section: Introductionmentioning

confidence: 98%

A Comparison Between Three IMUs for Strapdown Airborne Gravimetry

et al. 2015

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Strapdown airborne gravimetry relies on the combination of an inertial measuring unit (IMU) and a global navigation satellite system (GNSS) to measure the Earth's gravity field. Early results with navigation-grade IMUs showed similar accuracies to those obtained with scalar gravimetric systems in the down component. This paper investigates the accuracy of three IMUs used for strapdown airborne gravimetry under the same flight conditions. The three systems considered were navigation-grade IMUs, iXSea AIRINS and iMAR iNAV-FMS, and a tactical-grade Litton LN-200. The data were collected in 2010 over the Island of Madeira, Portugal, in the scope of GEOid over MADeira campaign. The coordinates and orientation of the aircraft were computed using an extended Kalman filter based on the inertial navigation approach. GNSS position and velocity observations were used to update the filter, and the gravity disturbance was considered to be a stochastic process and was part of the state vector. A new crossover point-based serial tuning was introduced to deal with the uncertainty of choosing the filter's a priori information. The results show that with the iXSea accuracies of 2.1 and 1.6 mGal can be obtained for 1.7 and 5.0 km of spatial resolution (half-wavelength), respectively. iMAR's results were significantly affected by a nonlinear drift, which led to lower accuracies of 4.1-5.5 mGal. Remarkably, Litton showed very consistent results and achieved an accuracy of about 4.5 mGal at 5 km of spatial resolution (half-wavelength).

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“…In recent decades, the airborne gravimetry technique has become more and more important for the acquisition of local gravity field data [1,2]. This is due to the fact that it permits investigating large areas, of about 100 km× 100 km, by a few days survey and at a relatively low cost, if compared to other techniques, such as ground point-wise measurements, which can be quite time consuming and expensive.…”

Section: Introductionmentioning

confidence: 99%

“…This technology, in fact, permitted solving the major problem of precise estimation of the aircraft position and led to the improvement of the existing measurement systems and consecutively to the spread of the airborne gravimetry for both the geophysical exploration and geodetic applications. The new accuracy after the advent of GPS were of few mGal (1 mGal = 1 × 10 −5 ms 2 ) at a spatial resolution of 5-6 km [1]. Thanks to this technological advancement, apart from the classical stabilized platform system, various measuring systems started to be deployed like the Strapdown Inertial Navigation System, which is based on a set of three orthogonal accelerometers and three gyroscopes or the system based on a combination of GPS and Inertial Measurement Units, used to determine all the components of the gravity vector [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Thanks to this technological advancement, apart from the classical stabilized platform system, various measuring systems started to be deployed like the Strapdown Inertial Navigation System, which is based on a set of three orthogonal accelerometers and three gyroscopes or the system based on a combination of GPS and Inertial Measurement Units, used to determine all the components of the gravity vector [5][6][7][8]. Nowadays, even if different research groups were able to show that strapdown systems can basically produce the same gravity quality of the stabilized platform one [1,9,10] (also for production-oriented campaigns under challenging conditions), the latter is still considered as the standard technique, especially for geophysical applications.…”

Section: Introductionmentioning

confidence: 99%

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A New Tool for Airborne Gravimetry Survey Simulation

Sampietro¹,

Mansi²,

Capponi³

2018

Geosciences

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Airborne gravimetry represents nowadays probably the most efficient technique to collect gravity observations close to the Earth's surface. In the 1990s, thanks to the development of the Global Navigation Satellite Systems (GNSS), which has made accurate navigational data available, this technique started to spread worldwide because of its capability to provide measurements in a fast and cost-effective way. Differently from other techniques such as shipborne gravimetry, it has the advantage to provide gravity measurements also in challenging environments which can be difficult to access otherwise, like mountainous areas, rain forests and polar regions. For such reasons, airborne gravimetry is used for various applications related to the regional gravity field modelling: from the computation of high accurate local geoid for geodetic applications to geophysical ones, specifically related to oil and gas exploration activities or more in general for regional geological studies. Depending on the different kinds of application and the final required accuracy, the definition of the main characteristics of the airborne survey, e.g., the planar distance between consecutive flight tracks, the aircraft velocity, etc., can be a difficult task. In this work, we present a new software package, which would help in properly accomplishing the survey design task. Basically, the developed software solution allows for generating a realistic (from the observation noise point of view) gravimetric signal, and, after that, to predict the accuracy and spatial resolution of the final retrievable gravimetric field, in terms of gravity disturbances, given the flight main characteristics. The proposed procedure is suited for airborne survey planning in order to be able to optimize the design of the survey according to the required final accuracy. With the aim to evaluate the influence of the various survey parameters on the expected accuracy of the airborne survey, different numerical tests have been performed on simulated and real datasets. For instance, it has been shown that if the observation noise is not properly modeled in the data filtering step, the survey results degrade about 25%, while not acquiring control lines during the survey will basically reduce the final accuracy by a factor of two.

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Airborne Gravity Field Determination

Cited by 51 publications

References 12 publications

Upward continuation of Dome-C airborne gravity and comparison with GOCE gradients at orbit altitude in east Antarctica

Upward continuation of Dome-C airborne gravity and comparison with GOCE gradients at orbit altitude in east Antarctica

A Comparison Between Three IMUs for Strapdown Airborne Gravimetry

A New Tool for Airborne Gravimetry Survey Simulation

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