Performance measures in aeromagnetic compensation

Noriega, Gerardo

doi:10.1190/1.3657070

Cited by 58 publications

(35 citation statements)

References 6 publications

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“…[]. Changes in the magnetic field resulting from aircraft maneuvers and heading changes were compensated for by compensation corrections [ Leliak , ; Noriega , ] derived with PEIComp software. Compensation coefficients were established from box patterns flown at high elevation in magnetically quiet regions located close to both Thule and Kangerlussuaq.…”

Section: Datamentioning

confidence: 99%

Resolving bathymetry from airborne gravity along Greenland fjords

et al. 2015

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Recent glacier mass loss in Greenland has been attributed to encroaching warming waters, but knowledge of fjord bathymetry is required to investigate this mechanism. The bathymetry in many Greenland fjords is unmapped and difficult to measure. From 2010 to 2012, National Aeronautics and Space Administration's Operation IceBridge collected a unique set of airborne gravity, magnetic, radar, and lidar data along the major outlet glaciers and fjords in Greenland. We applied a consistent technique using the IceBridge gravity data to create 90 bathymetric profiles along 54 Greenland fjords. We also used this technique to recover subice topography where warm or crevassed ice prevents the radar system from imaging the bed. Here we discuss our methodology, basic assumptions and error analysis. We present the new bathymetry data and discuss observations in six major regions of Greenland covered by IceBridge. The gravity models provide a total of 1950 line kilometers of bathymetry, 875 line kilometers of subice topography, and 12 new grounding line depths.

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Section: Datamentioning

confidence: 99%

Resolving bathymetry from airborne gravity along Greenland fjords

et al. 2015

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“…To assess the accuracy of the estimated coefficients, the standard deviation of the residual interference can be used instead of the index improvement ratio [14]. The classic recursive least squares method is used here to estimate the coefficients.…”

Section: B Simulation Results and Analysismentioning

confidence: 99%

An Aeromagnetic Compensation Coefficient-Estimating Method Robust to Geomagnetic Gradient

Dou

Han

Niu

et al. 2016

IEEE Geosci. Remote Sensing Lett.

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Most existing methods used in aeromagnetic compensation assume a constant geomagnetic field. These methods do not take into consideration the geomagnetic gradient, which can reduce the accuracy of the estimated coefficients of the Tolles-Lawson model. In practice, aside from the magnetic interference from the aircraft, a residual component of the geomagnetic field is contained in the filtered magnetic field signal. In this letter, the component of the geomagnetic field in the filtered magnetic field signal is modeled as a function of the longitude, latitude, and altitude of the aircraft. The linear equation for estimating the coefficients is then extended by combining the Tolles-Lawson model with the proposed model. Simulation results indicate that the proposed method is able to include the variance caused by the geomagnetic gradient into the Tolles-Lawson model calculation and results in a better aeromagnetic compensation.

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“…While having advantages over other alternatives [21], e.g., the figure of merit [29], the standard deviation σ A cannot ensure the robustness of the estimated coefficients [4]. Thus, an additional flight consisting of the same maneuvers as the calibration flight is necessary [20], and only then, the robustness can be evaluated with the cross-calibration index [4] defined as…”

Section: A Test Methods and Datamentioning

confidence: 99%

“…Generally, a calibration flight is required to acquire the scalar and vector magnetic field data to initially establish the system of linear equations. During the calibration flight, the aircraft typically needs to perform a series of maneuvers including rolls, pitches, and yaws along four orthogonal headings [21]. Since the maneuvers in different headings cannot alter the dip angle [5], the collected magnetic field data are incomplete to determine the true values of the coefficients.…”

Section: Introductionmentioning

confidence: 99%

An Adaptive Filter for Aeromagnetic Compensation Based on Wavelet Multiresolution Analysis

Dou

Han

Niu

et al. 2016

IEEE Geosci. Remote Sensing Lett.

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In aeromagnetic compensation, the multicolinearity of the Tolles-Lawson model is one of the main factors limiting the performance of the coefficient-estimating methods. Aside from the intrinsic characteristic of the Tolles-Lawson model, data filtering as a preprocessing step in estimating the coefficients has a significant impact on the multicolinearity. To solve this problem, an adaptive filter based on wavelet multiresolution analysis is proposed. By modifying the wavelet decomposition results of the Mallat algorithms and reconstructing the signal, the adaptive filter can be used to establish a system of linear equations not only by capturing the frequency characteristics of the aircraft maneuvers as is usual but also by having a weakened multicolinearity. Simulation results illustrate the effectiveness of the proposed adaptive filter.

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Performance measures in aeromagnetic compensation

Cited by 58 publications

References 6 publications

Resolving bathymetry from airborne gravity along Greenland fjords

Resolving bathymetry from airborne gravity along Greenland fjords

An Aeromagnetic Compensation Coefficient-Estimating Method Robust to Geomagnetic Gradient

An Adaptive Filter for Aeromagnetic Compensation Based on Wavelet Multiresolution Analysis

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