Inside GNSS Media & Research

NOV-DEC 2017

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www.insidegnss.com N O V E M B E R / D E C E M B E R 2 0 1 7 Inside GNSS 39 all but deep amplitude fades would disappear when users had switched from semi-codeless multi-frequency observables to the use of modernized civil signals due to their much higher tracking robustness. Instead, it seems that even with the modernized signals there is a measureable and occasion- ally meter level sense in which the ionosphere-free observables are not at all free of ionospheric influence. Additional Resources For additional information about ionospheric scintillation: [1] Conker, R.S., M.B. El-Arini, C.J. Hegarty and T. Hsiao (2003) "Modelling the effects of ionospheric scintillation on GPS/Satellite-Based Augmenta- tion System Availability", Radio Science, vol.38, no.1. [2] Carrano, C. S., K. M. Groves, W. J. McNeil, and P. H. Doherty (2013), Direct measurement of the residual in the ionosphere-free linear combina- tion during scintillation, Proceedings of the 2013 Institute of Navigation ION NTM meeting, San Diego, CA, January 28-30, 2013. For additional information on higher-order ionospheric effects: [3] Hoque, M.M., and N. Jankowski (2007), "Higher order ionospheric effects in precise GNSS positioning," Journal of Geodesy number 81, pp 259-268 [4] Liu, Z., Y. Li, J. Guo, and F. Li (2016) "Influence of higher-order ionospheric delay correction on GPS precise orbit determination and precise position- ing," Geodesy and Geodynamics, Volume 7, Issue 5, September 2016, pp 369-376 For information about canonical fades: [5] Liu, Z., Y. Li, J. Guo, and F. Li (2016) "Influence of higher-order ionospheric delay correction on GPS precise orbit determination and precise position- ing," Geodesy and Geodynamics, Volume 7, Issue 5, September 2016, pp 369-376. Authors Nadezda Sokolova received her PhD degree in 2011 from Norwegian University of Science and Technology (NTNU), where she worked on weak GNSS signal track- ing and use of GNSS for precise velocity and acceleration determination. Currently, she works as a research scientist at SINTEF Digital, and adjunct associate professor at the Engineering Cybernetics Department, NTNU focusing on GNSS integrity monitoring and multi-sensor navi- gation. Aiden Morrison received his PhD degree in 2010 from the Univer- sity of Calgary, where he worked on ionospheric phase scintillation char- acterization using multi frequency civil GNSS signals. Currently, he works as a research scientist at SINTEF Digital. His main research interests are in the areas of GNSS and multi-user collaborative navigation systems. James T. Curran received a B.E. in Electri- cal & Electronic Engi- neering in 2006 and a Ph.D. in Telecommunica- tions in 2010, from the Department of Electrical Engineering, University College Cork, Ireland. He worked as a senior research engineer with the PLAN Group in the University of Calgary from 2011 to 2013 and as a grant-holder at the Joint Research Centre (JRC) of the European Commis- sion, Italy from 2013. He is currently a radio-navi- gation engineer at the European Space Agency (ESA), in the Netherlands. His main research inter- ests are signal processing, information theory, cryptography and software defined radio for GNSS. Adaptive narrow and wide band interference mitigation, multiple logging sessions and more all on low power of <2 W PolaRx5 Reference Receivers

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