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A Dynamic Vector-Formed Information Sharing Algorithm Based on Two-State Chi Square Detection in an Adaptive Federated Filter

Published online by Cambridge University Press:  20 August 2018

Jianxin Xu Open the ORCID record for Jianxin Xu [Opens in a new window] ,
Zhi Xiong ,
Jianye Liu  and
Rong Wang
Jianxin Xu*
Affiliation:
(Nanjing University of Aeronautics & Astronautics, College of Automation Engineering, 211106, Nanjing, China)
Zhi Xiong
Affiliation:
(Nanjing University of Aeronautics & Astronautics, College of Automation Engineering, 211106, Nanjing, China)
Jianye Liu
Affiliation:
(Nanjing University of Aeronautics & Astronautics, College of Automation Engineering, 211106, Nanjing, China)
Rong Wang
Affiliation:
(Nanjing University of Aeronautics & Astronautics, College of Automation Engineering, 211106, Nanjing, China)
*
(E-mail: xujianxin@nuaa.edu.cn)
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Abstract

The accuracy and fault tolerance of filters are directly affected by the filter architecture and algorithm, thus influencing navigation performance. The chi square detection used in the conventional reset federated filter is not sensitive to soft faults, and it is easy to cause the health subsystem to be polluted through information sharing. It is a challenge to design an adaptive reset federated filter to improve the performance of the navigation system. Therefore, taking the Strapdown Inertial Navigation System/Global Positioning System/Celestial Navigation System/Synthetic Aperture Radar (SINS/GPS/CNS/SAR) integrated navigation system as an example, an adaptive federated filter architecture for vector-formed information sharing without a fault isolation module is designed in this paper. The proposed method uses the two-state chi square detection algorithm to calculate the parameters corresponding to each state, making the state with higher accuracy obtain a greater information distribution coefficient. In addition, according to the value of vector-formed information sharing, an adaptive coefficient of measurement noise is designed. This improves the adaptability of the navigation system to soft faults. Simulation results show that the accuracy of the proposed algorithm has the same performance compared with the conventional method under normal circumstances. When the sensor has a soft fault, the adaptive federated filter algorithm proposed in this paper can adaptively adjust the distribution coefficients, eliminate the influence of the fault information and improve the precision of the navigation system. The approach described in this paper can be used in multi-sensor integrated navigation. It will have better performance in engineering applications.

Keywords

Integrated NavigationFederated FilterVector-formed Information SharingState Chi-Square Test
Type
Research Article
Information
The Journal of Navigation , Volume 72 , Issue 1 , January 2019 , pp. 101 - 120
Copyright
Copyright © The Royal Institute of Navigation 2018 

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