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Asynchronous Pseudolite Navigation Using C/N0 Measurements

  • Daniele Borio (a1), Ciro Gioia (a1) and Gianmarco Baldini (a1)
Abstract

The problem of indoor navigation is investigated using a Commercial Off-the-Shelf (COTS) pseudolite system. The system is operated in synchronous and asynchronous mode. It is shown that, when the system is operated in synchronous mode, it is unsuitable for deep indoor operations: in complex propagation environments, the synchronisation required for metre level navigation is difficult to achieve and different solutions have to be adopted. Two asynchronous approaches are thus considered and indoor navigation with metre level accuracy is demonstrated using C/N0 measurements. The approaches use a modified Receiver Signal Strength (RSS) navigation algorithm and a weighted centroid technique, respectively. In both cases, a pre-filtering stage has been adopted to enhance the quality of C/N0 measurements. The two methods have been compared under different operating conditions and the advantages and drawbacks of the two techniques have been analysed. The experiments demonstrate that metre level accuracy can be achieved using asynchronous pseudolites. These results are particularly encouraging since they were obtained without exploiting map constraints and prior knowledge of the user position.

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Copyright
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Corresponding author
(E-mail: daniele.borio@jrc.ec.europa.eu)
Linked references
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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

A. Conti , M. Guerra , D. Dardari , N. Decarli and M.Z. Win (2012). Network experimentation for cooperative localization. IEEE Journal on Selected Areas Communication, 30(2), 467475.

H. Kuusniemi , A. Wieser , G. Lachapelle and J. Takala (2007). User-level reliability monitoring in urban personal satellite-navigation. IEEE Transactions on Aerospace and Electronic Systems, 43(4), 13051318.

N. Patwari , J. Ash , S. Kyperountas , A. Hero III, R.L. Moses and N.S. Correal (2005). Locating the nodes: cooperative localization in wireless sensor networks. IEEE Signal Processing Magazine, 22(4), 5469.

P. Tarrio , A.M. Bernardos and J. Casar (2011). Weighted least squares techniques for improved received signal strength based localization, Sensors, 11, 85698592.

J. Wang , P. Urriza , Y. Han and D. Cabric (2011). Weighted centroid localization algorithm: Theoretical analysis and distributed implementation. IEEE Transaction on Wireless Communication, 10(10), 34033413.

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The Journal of Navigation
  • ISSN: 0373-4633
  • EISSN: 1469-7785
  • URL: /core/journals/journal-of-navigation
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