A Two-dimensional Gravity Matching Navigation Method Based on Gravity Lighthouse Navigation System
Gravity-matched navigation technology is of indispensable value for error correction of inertial navigation systems due to its passivity,high stealth and strong anti-jamming properties.However,the traditional one-dimensional gravity matching algorithm is often limited in practical applications due to the frequent occurrence of mis-matching and the under-utilisation of two-dimensional gravity base map information.To address these problems,a new concept of gravity lighthouse navigation system is proposed in this paper,which deeply exploits and utilises the information in two-dimensional gravity basemaps in a face-matching manner.Firstly,high-quality fitness zones are accurately screened based on multi-at-tribute decision criteria,which are figuratively called"gravity lighthouses".Subsequently,accurate navigation based on these"gravity lighthouses"is achieved by a two-dimensional image matching algorithm.The simulation experiment results show that the distance error obtained by the gravity lighthouse matching method is reduced by 62.22%compared to the original inertial navigation error.Compared with traditional one-dimensional matching methods,the accuracy of gravity lighthouse matching has been improved by 18.58%.The significant effect of this algorithm in reducing inertial navigation errors and improving navigation accuracy provides a new and effective approach for error correction in inertial navigation systems.
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