On the Potential of Least Squares Response Method for the Calibration of Superconducting Gravimeters
One of the most important operating procedures after the installation of a superconducting gravimeter (SG) is its calibration. The calibration process can identify and evaluate possible time variability in the scale factor and in the hardware anti-aliasing filter response. The SG installed in Cantle...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | International Journal of Geophysics |
| Online Access: | http://dx.doi.org/10.1155/2012/741729 |
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| author | Mahmoud Abd El-Gelil Spiros Pagiatakis Ahmed El-Rabbany |
| author_facet | Mahmoud Abd El-Gelil Spiros Pagiatakis Ahmed El-Rabbany |
| author_sort | Mahmoud Abd El-Gelil |
| collection | DOAJ |
| description | One of the most important operating procedures after the installation of a superconducting gravimeter (SG) is its calibration. The calibration process can identify and evaluate possible time variability in the scale factor and in the hardware anti-aliasing filter response. The SG installed in Cantley, Canada is calibrated using two absolute gravimeters and the data are analysed in the time and frequency domains to estimate the SG scale factor. In the time domain, we use the weighted linear regression method whereas in the frequency domain we use the least squares response method. Rigorous statistical procedures are applied to define data disturbances, outliers, and realistic data noise levels. Using data from JILA-2 and FG5-236 separately, the scale factor is estimated in the time and frequency domains as
−78.374±0.012 μGal/V and −78.403±0.075 μGal/V, respectively. The relative accuracy in the time domain is 0.015%. We cannot identify any significant periodicity in the scale factor. The hardware anti-aliasing filter response is tested by injecting known waves into the control electronics of the system. Results show that the anti-aliasing filter response is stable and conforms to the global geodynamics project standards. |
| format | Article |
| id | doaj-art-a431a4e8f7ee4fda954267b141fcebb3 |
| institution | Kabale University |
| issn | 1687-885X 1687-8868 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Geophysics |
| spelling | doaj-art-a431a4e8f7ee4fda954267b141fcebb32025-02-03T06:07:04ZengWileyInternational Journal of Geophysics1687-885X1687-88682012-01-01201210.1155/2012/741729741729On the Potential of Least Squares Response Method for the Calibration of Superconducting GravimetersMahmoud Abd El-Gelil0Spiros Pagiatakis1Ahmed El-Rabbany2Geomatics Division, Faculty of Engineering & the Built Environment, University of Cape Town, Cape Town 7700, South AfricaDepartment of Earth and Space Science and Engineering, York University, Toronto, ON, M3J 1P3, CanadaDepartment of Civil Engineering, Ryerson University, Toronto, ON, M5B 2K3, CanadaOne of the most important operating procedures after the installation of a superconducting gravimeter (SG) is its calibration. The calibration process can identify and evaluate possible time variability in the scale factor and in the hardware anti-aliasing filter response. The SG installed in Cantley, Canada is calibrated using two absolute gravimeters and the data are analysed in the time and frequency domains to estimate the SG scale factor. In the time domain, we use the weighted linear regression method whereas in the frequency domain we use the least squares response method. Rigorous statistical procedures are applied to define data disturbances, outliers, and realistic data noise levels. Using data from JILA-2 and FG5-236 separately, the scale factor is estimated in the time and frequency domains as −78.374±0.012 μGal/V and −78.403±0.075 μGal/V, respectively. The relative accuracy in the time domain is 0.015%. We cannot identify any significant periodicity in the scale factor. The hardware anti-aliasing filter response is tested by injecting known waves into the control electronics of the system. Results show that the anti-aliasing filter response is stable and conforms to the global geodynamics project standards.http://dx.doi.org/10.1155/2012/741729 |
| spellingShingle | Mahmoud Abd El-Gelil Spiros Pagiatakis Ahmed El-Rabbany On the Potential of Least Squares Response Method for the Calibration of Superconducting Gravimeters International Journal of Geophysics |
| title | On the Potential of Least Squares Response Method for the Calibration of Superconducting Gravimeters |
| title_full | On the Potential of Least Squares Response Method for the Calibration of Superconducting Gravimeters |
| title_fullStr | On the Potential of Least Squares Response Method for the Calibration of Superconducting Gravimeters |
| title_full_unstemmed | On the Potential of Least Squares Response Method for the Calibration of Superconducting Gravimeters |
| title_short | On the Potential of Least Squares Response Method for the Calibration of Superconducting Gravimeters |
| title_sort | on the potential of least squares response method for the calibration of superconducting gravimeters |
| url | http://dx.doi.org/10.1155/2012/741729 |
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