Altimetry based gravity anomaly has poor resolution and relatively smooth effectiveness,which results in difficulty in obtaining local short-wavelength information.It is necessary to fuse altimetry based gravity anomaly with shipborne based gravity anomaly,which has higher accuracy and contains more short-wavelength information than the altimetry based gravity anomaly,and to study the method of multi-source gravity fusion so as to improve the accuracy of gravity anomaly field.In this paper,a kind of multi-source gravity field fusion method based on wavelet analysis was proposed;the authors designed different fusion strategies for different frequency coefficients and also discussed the differences of the fusion results when they are based on different wavelet functions.The proposed method was applied to the northern margin of the South China Sea.The fusion result contains more accurate short-wavelength anomalies than the altimetry-based gravity anomalies along ship tracks,and it also has more accurate long wavelength characteristics than the ship borne gravity anomalies between shiptracks.
谭沛森. 多源重力数据融合方法及其在南海的应用[J]. 物探与化探, 2018, 42(1): 104-110.
Pei-Sen TAN. The multi-source gravity field fusion method and its application to the South China Sea. Geophysical and Geochemical Exploration, 2018, 42(1): 104-110.
Andersen O.Marine gravity and geoid from satellite altimetry[M]//Sansò F,Sideris M G,Geoid Determination.Berlin Heidelberg:Springer,2013:401-451.
[2]
Hwang C.Inverse Vening Meinesz formula and deflection-geoid formula: applications to the predictions of gravity and geoid over the South China Sea[J].Journal of Geodesy,1998,72(5):304-312.
[3]
Hwang C E C,Kao B P.Global derivation of marine gravity anomalies from seasat,Geosat,ERS-1 and TOPEX/POSEIDON altimeter data[J].Geophysical Journal International,1998,134(2):449-459.
[4]
Sandwell D,Garcia E,Soofi K,et al.Toward 1-mGal accuracy in global marine gravity from CryoSat-2,Envisat,and Jason-1[J].The Leading Edge,2013,32(8):892-899.
[5]
Sandwell D T.Antarctic marine gravity field from high-density satellite altimetry[J].Geophysical Journal International,1992,109(2):437-448.
[6]
Sandwell D T, Smith W H F.Global marine gravity from retracked Geosat and ERS-1 altimetry:Ridge segmentation versus spreading rate[J].Journal of Geophysical Research:Solid Earth,2009,114(B1):B01411.
[7]
Sandwell D T, Smith W H F.Marine gravity anomaly from Geosat and ERS 1 satellite altimetry[J].Journal of Geophysical research:Solid Earth,1997,102(B5):10039-10054.
Kern M,Schwarz K K P P,Sneeuw N.A study on the combination of satellite,airborne,and terrestrial gravity data[J].Journal of geodesy,2003,77(3-4):217-225.
