Print Email Facebook Twitter A hybrid optical–wireless network for decimetre-level terrestrial positioning Title A hybrid optical–wireless network for decimetre-level terrestrial positioning Author Koelemeij, Jeroen C.J. (Vrije Universiteit Amsterdam) Dun, H. (TU Delft Mathematical Geodesy and Positioning) Diouf, C.E.V. (TU Delft Mathematical Geodesy and Positioning) Dierikx, Erik F. (VSL Dutch Metrology Institute) Janssen, G.J.M. (TU Delft Signal Processing Systems) Tiberius, C.C.J.M. (TU Delft Mathematical Geodesy and Positioning) Date 2022 Abstract Global navigation satellite systems (GNSS) are widely used for navigation and time distribution1–3, features that are indispensable for critical infrastructure such as mobile communication networks, as well as emerging technologies such as automated driving and sustainable energy grids3,4. Although GNSS can provide centimetre-level precision, GNSS receivers are prone to many-metre errors owing to multipath propagation and an obstructed view of the sky, which occur particularly in urban areas where accurate positioning is most needed1,5,6. Moreover, the vulnerabilities of GNSS, combined with the lack of a back-up system, pose a severe risk to GNSS-dependent technologies7. Here we demonstrate a terrestrial positioning system that is independent of GNSS and offers superior performance through a constellation of radio transmitters, connected and time-synchronized at the subnanosecond level through a fibre-optic Ethernet network8. Using optical and wireless transmission schemes similar to those encountered in mobile communication networks, and exploiting spectrally efficient virtual wideband signals, the detrimental effects of multipath propagation are mitigated9, thus enabling robust decimetre-level positioning and subnanosecond timing in a multipath-prone outdoor environment. This work provides a glimpse of a future in which telecommunication networks provide not only connectivity but also GNSS-independent timing and positioning services with unprecedented accuracy and reliability. To reference this document use: http://resolver.tudelft.nl/uuid:4b4113a2-6dda-407d-b3a6-64665154273e DOI https://doi.org/10.1038/s41586-022-05315-7 Embargo date 2023-07-01 ISSN 0028-0836 Source Nature: international weekly journal of science, 611 (7936), 473-478 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2022 Jeroen C.J. Koelemeij, H. Dun, C.E.V. Diouf, Erik F. Dierikx, G.J.M. Janssen, C.C.J.M. Tiberius Files PDF s41586_022_05315_7.pdf 19.1 MB Close viewer /islandora/object/uuid:4b4113a2-6dda-407d-b3a6-64665154273e/datastream/OBJ/view