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A study on volunteer augmentation navigation technology

Science china(Physics,Mechanics & Astronomy) 2011年第6期54卷 1029-1034页

作者： wu haitao 1,2.lu xiaochun 1,{2.,{3.,2.1 national time Service center,chinese Academy of sciences,xi’an 710600,china 2.Key Laboratory of Precision Navigation and Timing Technology,chinese Academy of sciences,xi’an 710600,china 1. national time Service {2. Chinese Academy of Sciences Xi’an 710600 China2. Key Laboratory of Precision Navigation and Timing Technology Chinese Academy of Sciences Xi’an 710600 China

Navigation augmentation technology is one of the most common methods to increase the continuity,reliability and integrity of the global satellite navigation *** concept of volunteer augmentation navigation (VNA) is proposed and the elements and topological structure of VNA are also analyzed in this *** study focuses on the neural network model that volunteers and ordinary users use modern communication information network to exc{2.ge self-organizing *** neural cell model of Volunteer Augmentation Navigation using shared information is *** interactive general relative positioning is *** basic theories and methods of volunteer augmentation navigation are formed on the basis of the above-mentioned *** study of realization mec{2.ism of volunteer augmentation technology helps to form a relatively integral architecture of volunteer augmentation navigation.A user self-service satellite navigation augmentation which combines information exc{2.ge and navigation services may strengthen the continuity,reliability and integrity of the navigation *** volunteer augmentation navigation theory proposed in this paper improves the traditional satellite navigation application model and expands the connotation and denotation of satellite navigation augmentation methods.

关键词： volunteer augmentation navigation self-organizing information exchange interactive general relative positioning

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Differential equation dynamical system based assessment model in GNSS interoperability

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Science china(Physics,Mechanics & Astronomy) 2011年第6期54卷 996-1003页

作者： han tao {2. {3. WANG Xue RAO YongNan zou decai YANG JianFei wu YangYang national time Service {2. Xi'an 710600China Key Laboratory of Precision Navigation and Timing Technology Chinese Academy of SciencesXi'an 710600China Graduate University of the chinese Academy of sciences Beijing 100049China Department of Economics and Management Northwestern UniversityXi'an 710127China

With the development of Global Navigation Satellite System (GNSS),the idea of GNSS interoperability is born and has become the focus of study in the field of satellite *** popularity for GNSS to augment the interoperability with the existing ones necessitates the study of the assessment algorithm of this *** this paper,an assessment algorithm for interoperability comprehensive benefits based on the differential equation dynamical system is *** are two important aspects in GNSS that interoperability will affect:one is the performance advancement;the other one is the cost of adopting *** researching the complex relationship between the performance and cost,we found this relationship is similar as what between prey and predator in biomathematics,so the Lotka-Volterra model used to depict the prey-predator relationship is a felicitous *** building a differential dynamical model,we analyze the existence and stability of the positive equilibrium in the *** a Cost-Effective Function of GNSS is constructed based on the positive equilibrium,which is employed to assess the interoperability,qualitatively and ***,the paper demonstrates the significance of the model and its application by citing a numerical example.

关键词： interoperability assessment model differential dynamical system GNSS stability

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