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Three‐Dimensional Gravity Model Applied to Underwater Navigation
Author(s) -
Lei YAN,
Hao FENG,
Zhongliang DENG,
Zhengbing GAO
Publication year - 2004
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.2004.tb00204.x
Subject(s) - inertial navigation system , gravity anomaly , geodesy , gravimeter , free air gravity anomaly , anomaly (physics) , gravitation , geology , computer science , inertial frame of reference , physics , geophysics , classical mechanics , bouguer anomaly , paleontology , casing , condensed matter physics , oil field
At present, new integrated navigation, which usesthe location function of reference gravity anomaly map to control the errors of the inertial navigation system (INS), has been developed in marine navigation. It is named the gravity‐aided INS. Both the INS and real‐time computation of gravity anomalies need a 3‐D marine normal gravity model. Conventionally, a reduction method applied in geophysical survey is directly introduced to observed data processing. This reduction does not separate anomaly from normal gravity in the observed data, so errors cannot be avoided. The 3‐D marine normal gravity model was derived from the J2 gravity model, and is suitable for the region whose depth is less than 1000 m.