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Analysis and selection of global marine gravity/gravity gradient aided navigation matching areas

Analysis and selection of global marine gravity/gravity grad...

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第九届中国卫星导航学术年会

作者： Lin Wu Hubiao Wang Hua Chai Lu Zhang Houtse Hsu Yong Wang State Key Laboratory of Geodesy and Earth’s Dynamics Institute of Geodesy and GeophysicsChinese Academy of Sciences University of Chinese Academy of Sciences

With the development of underwater passive navigation in recent years,gravity or gravity gradient matching navigation are utilized to correct the accumulated navigation errors of inertial navigation *** accuracy and success rate of gravity/gravity gradient matching navigation are seriously affected by the features of gravity changes in the sailing *** this paper,a parameter named average gravity difference(AGD) was introduced here to express the level of gravity changes in a certain *** the overall survey of global marine gravity,the AGD values of local areas were calculated and *** a series of experiments,the relationship of AGD values and navigation accuracy in local areas can be generally *** the criterion of selection of matching areas was induced,marine gravity matching areas for navigation can be *** results showed that,take gravity as an example,the AGD values can range from about 0.6 to 2.7 m Gal/nautical mile(1 nautical mile = 1 n mile = 1852 m) in different areas of the oceans around the *** present technologies,gravity matching navigation could achieve an accuracy of 0.5 n miles in matching areas which have AGD values larger than 2.0 m Gal/n *** this criterion,South China Sea,North Indian Ocean and some other areas can be *** these areas,better navigation results can be obtained since they have rougher gravity *** results would be significant for the development of gravity aided navigation technologies and the construction of underwater PNT system.

关键词： gravity aided navigation matching areas selection underwater navigation gravity matching gravity gradient

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