Inside GNSS Media & Research

MAR-APR 2018

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64 Inside GNSS M A R C H / A P R I L 2 0 1 8 intentional counterfeiting of GNSS sig- nals, i.e., spoofing. During the INLU project, various state-of-the-art and promising candi- dates of future receiver techniques are studied to understand how they can contribute to robust PVT results for land-based users. This comprises not only tracking and RAIM algorithms but also integration of GNSS with iner- tial measurements using, for example, filter banks. A GNSS end-to-end simulator needs to have a high versatility to be able to accommodate the manifold require- ments that such a project imposes on it. Key factors for the achieved flexibility of the PIPE and SNIPE tools are: • partitioning into units that serve single tasks with clear inter-module and input data interfaces, • abstraction layers that allow for the addition of tracking and PVT com- putation methods to the receiver with minimum effort and the ability to operate these in bit-true and semi- analytic modes. T he ef fect iveness of t he chosen approach was demonstrated in a sce- nario where a traditional GNSS receiver was misled by a spoofer while the imple- mented filter bank approach corrected for the error transparently. A separate article will report on the entirety of INLU's results, i.e., the con- clusions drawn from results gained from a number of stochastic scenarios. Additional Resources [1] Brenner, M., "Integrated GPS/Inertial Fault Detec- tion Availability," NAVIGATION, Volume: 43, Issue: 2, 1996 [2] CDX - The Channel Data Exchange Library, [3] Diesel, J. and Luu, S., "GPS/IRS AIME: Calculation of Thresholds and Protection Radius using Chi- Square Methods," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Insti- tute of Navigation (ION GPS 1995), 1995 [4] Gulie, I., Schubert, F. M., Wendel, J., Kohl, R., Wul- lems, C., and Ioannides, R., "A Geometrical-Statistical Multipath Propagation Model for Railway Naviga- tion Applications," Navitec 2016, Noordwijk, The Netherlands, 2016 [5] Joerger, M. and Pervan, P., "Integrity Risk of Kal- man Filter-Based RAIM," Proceedings of the 24th Inter- national Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011), 2011 [6] Schubert, F. M., Heimerl, M., and Wendel, J., "Components Count Decrease of Channel Respons- es Using Markov Processes," Navitec 2014, Noordwijk, The Netherlands, 2014 (2014b) [7] Schubert, F. M., Wendel, J., Kurzhals, C., and Kohl, R., "Tracking of High-Rate BOC Signals in an Urban Area," ION Pacific PNT, Honolulu, HI, May 2015 (2015) [8] Schubert, F. M., Wendel, J., Soellner, M., Kaindl, M., and Kohl, R., "The Astrium Correlator: Unambiguous Tracking of High-Rate BOC Signals," IEEE/ION Position Location and Navigation Symposium (PLANS), Mon- terey, CA, May 2014 (2014a) [9] Schubert, F. M., Gulie, I., Wendel, J., Kohl, R., Kurzhals, C., Prechtl, T., Schönhuber, M., Fontan, F. P., Fleury, B. H., Pedersen, T., Pérez, R. O., "JOVIAAL – Towards the Next Generation High-Fidelity Channel Model for Land-Mobile Satellite Navigation Users," Navitec 2016, Noordwijk, The Netherlands, 2016 (2016) [10] Wendel, J., Schubert, F. M., and Floch, J.-J., "An Efficient Filter Bank Approach for the Provision of Integrity in Integrated Navigation Systems," Euro- pean Journal of Navigation, Volume: 14, Issue: 5, September 2016 (2016a) [11] Wendel, J., Schubert, F. M., Floch, J.-J., Ioannides, R., and Wullems, C., "GNSS-based Integrity for Rail- way users using Map-Aided Solution Separation," Navitec 2016, Noordwijk, The Netherlands, 2016 (2016b) Authors Frank Max Schubert gradu- ated in 2007 in Electrical Engi- neering and Information Tech- n o l o g y a t t h e K a r l s r u h e Institute of Technology in Germany. From 2007 until 2011 he was member of the scientific staff at the Institute of Communications and Navigation of the German Aerospace Center (DLR). He worked partly in the Wave Propagation and Interaction Section at the European Space Agency (ESA) in Noordwijk, The Netherlands, within the Networking/Partnering Initiative from 2008 until 2010. From 2009 until 2012 Schubert was an external Ph.D. student in the Navigation and Communications Section at Aal- borg University (AAU), Denmark. He obtained the Ph.D. degree from AAU in wireless communications in October 2012. In November 2012 he joined Air- bus Defence and Space in Ottobrunn, Germany, as system engineer for navigation signals. There he was working on PRS receivers, robust acquisition and tracking techniques for high-rate BOC signals, channel modeling, and GNSS constellation simula- tor architectures. Since March 2018 he is a Cyber Security Architect for Space Systems with Airbus Cybersecurity. Jan Wendel received the Dipl.- Ing. and Dr.-Ing. degrees in Electrical Engineering from the University of Karlsruhe, Germany, in 1998 and 2003, respectively. From 2003 until 2006 he was an assistant pro- fessor at the University of Karl- sruhe, where his research interests focused on integrated navigation systems and MAV flight con- trol. Since 2006, he is private lecturer at the Univer- sity of Karlsruhe. In 2006, Wendel joined MBDA in Munich, Germany, where he was responsible for the design, implementation and test of target tracking filters for the Medium Extended Air Defense System (MEADS), and for the development of navigation algorithms for a tightly coupled GPS/ INS system demonstrator. In 2009, he joined EADS Astrium GmbH in Munich, now Airbus Defence and Space, where he is involved in various activities related to satellite navigation including acquisition and tracking algorithms, interference detection and characterisation, integrity algorithms, and PRS receiver development. Ioana Gulie received her Dipl.-Ing. degree from the Faculty of Electronics, Tele- communication, and Informa- t i o n Te c h n o l o g y, p a r t o f Po l i t e h n i c a U n i v e r s i t y o f Bucharest, Romania, in 2007. From 2007 to 2012 she was a WORKING PAPERS FIGURE 5 Spoofing scenario position fixes from snapshot least squares (red markers) and GPB1- based GNSS/INS integrity algorithm (blue markers)

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