Error analysis in gravity aided navigation

For underwater vehicles, because GPS signals are not always available, it is necessary to use inertial navigation system (INS) for navigation. In order to improve the navigation performance, the gravity value calculated by the gravity field model is introduced into the navigation system to reduce th...

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Bibliographic Details
Published in:MATEC web of conferences 2018-01, Vol.160, p.7006
Main Authors: Hongwei, Wei, Meiping, Wu, Junbo, Tie, Shenquan, Wang
Format: Article
Language:English
Subjects:
Computer simulation
Error analysis
Global positioning systems
GPS
Gravitation
Inertial navigation
Mathematical models
Navigation systems
Satellite navigation systems
Satellites
Underwater vehicles
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Summary:For underwater vehicles, because GPS signals are not always available, it is necessary to use inertial navigation system (INS) for navigation. In order to improve the navigation performance, the gravity value calculated by the gravity field model is introduced into the navigation system to reduce the influence of gravity on the navigation accuracy. However, due to the difference between the actual gravity field and the gravity field model, the navigation error caused by gravity field still exists. In this paper, this error is studied based on the theoretical analysis and simulation. The results show that the accuracy of gravity-aided navigation will decrease sharply when the position error of the underwater vehicles reach 9.6 n miles, because at this moment, the calculation error of vertical deflection is the largest. In the simulation experiment, the position error of the gravity-aided navigation system reach 9.6 n miles in 44 hours. Therefore, for the underwater vehicles navigation system, it is recommended that the vehicles should be corrected once every 44 hours.
ISSN:2261-236X
2274-7214
2261-236X
DOI:10.1051/matecconf/201816007006