title: Performance Evaluation and Analysis for Gravity Matching Aided Navigation.
abstract: Simulation tests were accomplished in this paper to evaluate the performance of gravity matching aided navigation (GMAN). Four essential factors were focused in this study to quantitatively evaluate the performance: gravity database (DB) resolution, fitting degree of gravity measurements, number of samples in matching, and gravity changes in the matching area. Marine gravity anomaly DB derived from satellite altimetry was employed. Actual dynamic gravimetry accuracy and operating conditions were referenced to design the simulation parameters. The results verified that the improvement of DB resolution, gravimetry accuracy, number of measurement samples, or gravity changes in the matching area generally led to higher positioning accuracies, while the effects of them were different and interrelated. Moreover, three typical positioning accuracy targets of GMAN were proposed, and the conditions to achieve these targets were concluded based on the analysis of several different system requirements. Finally, various approaches were provided to improve the positioning accuracy of GMAN.
authors.affiliation: State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China. wulin1108@gmail.com.
authors.forename: Lin
authors.initials: L
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China. wanghb@whigg.ac.cn.
authors.forename: Hubiao
authors.initials: H
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China. hchai@whigg.ac.cn.
authors.forename: Hua
authors.initials: H
authors.lastname: Chai
authors.affiliation: State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China. zhanglu315@mails.ucas.ac.cn.|University of Chinese Academy of Sciences, Beijing 100049, China. zhanglu315@mails.ucas.ac.cn.
authors.forename: Lu
authors.initials: L
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China. hsuh@whigg.ac.cn.
authors.forename: Houtse
authors.initials: H
authors.lastname: Hsu
authors.affiliation: State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China. ywang@whigg.ac.cn.
authors.forename: Yong
authors.initials: Y
authors.lastname: Wang
keywords: gravity aided navigation; gravity matching; performance evaluation; requirements analysis; underwater navigation