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Sensors 2017, 17(8), 1851; https://doi.org/10.3390/s17081851

Characteristics of Marine Gravity Anomaly Reference Maps and Accuracy Analysis of Gravity Matching-Aided Navigation

1
State Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Received: 2 July 2017 / Revised: 2 August 2017 / Accepted: 9 August 2017 / Published: 10 August 2017
(This article belongs to the Special Issue Inertial Sensors for Positioning and Navigation)
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Abstract

The variation of a marine gravity anomaly reference map is one of the important factors that affect the location accuracy of INS/Gravity integrated navigation systems in underwater navigation. In this study, based on marine gravity anomaly reference maps, new characteristic parameters of the gravity anomaly were constructed. Those characteristic values were calculated for 13 zones (105°–145° E, 0°–40° N) in the Western Pacific area, and simulation experiments of gravity matching-aided navigation were run. The influence of gravity variations on the accuracy of gravity matching-aided navigation was analyzed, and location accuracy of gravity matching in different zones was determined. Studies indicate that the new parameters may better characterize the marine gravity anomaly. Given the precision of current gravimeters and the resolution and accuracy of reference maps, the location accuracy of gravity matching in China’s Western Pacific area is ~1.0–4.0 nautical miles (n miles). In particular, accuracy in regions around the South China Sea and Sulu Sea was the highest, better than 1.5 n miles. The gravity characteristic parameters identified herein and characteristic values calculated in various zones provide a reference for the selection of navigation area and planning of sailing routes under conditions requiring certain navigational accuracy. View Full-Text
Keywords: underwater navigation; gravity matching; marine gravity anomaly reference map; characteristic parameter; regional location accuracy evaluation underwater navigation; gravity matching; marine gravity anomaly reference map; characteristic parameter; regional location accuracy evaluation
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Wang, H.; Wu, L.; Chai, H.; Xiao, Y.; Hsu, H.; Wang, Y. Characteristics of Marine Gravity Anomaly Reference Maps and Accuracy Analysis of Gravity Matching-Aided Navigation. Sensors 2017, 17, 1851.

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