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Ouyang Y.,Wuhan University | Ouyang Y.,Navel Institute of Hydrographic Surveying and Charting | Lu X.,Navel Institute of Hydrographic Surveying and Charting | Lu X.,Wuhan Naval University of Engineering | And 2 more authors.
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | Year: 2011

In order to eliminate the disturbance of different kind of errors, we propose an integrated method with two steps for compensating the systematic errors of marine and airborne measurements from L&R gravimeter. Firstly, crosscorrelation analysis is used to make corrections for the original cross-coupling correction coefficients obtained from the instrument manufacture, and give a systematic correction to the observed gravity. Then surveying line system adjustment is applied to the corrected gravity to further eliminate the disturbance of remainder errors. A practical marine gravity measurement set is used to prove the efficiency of the integrated data processing method. Source


Huang M.,Navel Institute of Hydrographic Surveying and Charting | Ouyang Y.,Navel Institute of Hydrographic Surveying and Charting | Ouyang Y.,Wuhan University | Liu M.,Zhengzhou University | And 2 more authors.
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | Year: 2015

Tikhonov regularization is introduced into the point-mass method to solve the ill-posed problem in fusion processing of multi-source gravity data. A point-mass model is regularized, and a modified regularization point-mass model is proposed. Finally, a sea-borne gravity data set and an airborne gravity data set from EGM2008 model are used as a case study to test the efficiency of regularization point-mass. Results show that the modified method can inhibit the amplifying effect of measurement errors due to the small singular values of ill-posed coefficient matrix, and thus improve the precision and stability of point-mass solutions. ©, 2015, Wuhan University. All right reserved. Source


Huang M.,Navel Institute of Hydrographic Surveying and Charting | Ouyang Y.,Navel Institute of Hydrographic Surveying and Charting | Ouyang Y.,Wuhan University | Zhai G.,Navel Institute of Hydrographic Surveying and Charting | Liu C.,Navel Institute of Hydrographic Surveying and Charting
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | Year: 2013

Nowadays, extensive marine gravity measurements, airborne gravity measurements and satellite gravity data exist for sea areas, and can be combined to build a precise digital gravity model. Based on a brief analysis of multi-source gravity data characteristics, we propose two new analytical methods for optimal combination of the marine, airborne and satellite gravity data. The first new method is called one-step fusion processing, in which an interpolation model is used to grid the multi-source gravity data with a double weight factor. The other new method is called multi-step fusion processing, in which the data management procedure is modified to a four step process based on the theories of adjustment, filtering, prediction and interpolation. When compared to the traditional statistical methods, such as Least Square Collocation, using these two new approaches can simplify data fusion procedures, with stabile and reliable computation results. Finally, a practical marine gravity measurement and a satellite gravity data set are used as a case study to demonstrate the efficiency of these proposed analytical data fusion processing methods. Source


Huang M.,Navel Institute of Hydrographic Surveying and Charting | Ouyang Y.,Navel Institute of Hydrographic Surveying and Charting | Ouyang Y.,Wuhan University | Zhai G.,Navel Institute of Hydrographic Surveying and Charting | Lu X.,Navel Institute of Hydrographic Surveying and Charting
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | Year: 2013

A brief analysis is made on the existing formulas of accuracy evaluation for multi-line overlapping measurements in ship-borne and airborne gravity survey. And the inconsistency between the formula derivations and survey adjustment theory is pointed out. Then a new set of accuracy evaluation formula is put forward and a suggestion is given for use of the new formulas. Source


Huang M.,Navel Institute of Hydrographic Surveying and Charting | Ouyang Y.,Navel Institute of Hydrographic Surveying and Charting | Ouyang Y.,Wuhan University | Liu M.,Zhengzhou University | And 2 more authors.
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | Year: 2014

Two practical downward continuation methods are proposed for the sea surveying areas in accordance with their gravity characteristics and available information addressing the uncertainty of downward continuation for airborne gravity data. In the first method, the continuation corrections are calculated by using the upward continuation of satellite gravity data, and in the other, by using EGM2008 gravity field model. A satellite gravity data set, two sea-borne gravity data sets, and an airborne gravity data set are used as a case study to test the efficiency of these new methods. Source

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