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Global Navigation Satellite Systems (GNSS) plays a fundamental part on the maritime navigation. Beyond positioning, GNSS is key for the operation of multiple interfaces on the bridge of a ship, compromising the skipper skills to perform traditional navigation. Jamming attacks have been recognized as a major vulnerability for GNSS and their proliferation have raised concerns, given the implication of GNSS into several safety-critical applications. This work provides an overview on the jamming threat and the main countermeasures techniques, especially in the fields of robust signal processing, adaptive antenna arrays and multi sensor fusion. Moreover, the effects of a Personal Privacy Device (PPD) on positioning based on conventional methods using GPS L1 is addressed. The experimentation is conducted on the Baltic Sea, where a civilian maritime jamming testbed was allocated, as result of the cooperation of DLR with the German Federal Network Agency.

Die Positionsbestimmung an Bord von Schiffen ist eines der Kernelemente der von der Internationalen Maritimen Organisation (IMO) 2006 initiierten e-Navigations Strategie. Die gesammelten Nutzeranforderungen belegen den Handlungsbedarf insbesondere bezüglich der Integrität von Positions-, Navigationsund Timing (PNT) Informationen. Basierend auf einer Analyse der aktuellen maritimen Standards sollen in diesem Vortrag ein Konzept für die zukünftige schiffseitige Bereitstellung von PNT Daten sowie erste experimentelle Ergebnisse zur schiffseitigen sensorfusionsbasierten PNT-Bestimmung vorgestellt und diskutiert werden.

This paper focuses on a maritime integrated PNT Module as the on-board part of maritime PNT system. The aim of the PNT Module is the robust provision of position, navigation and timing information in accordance with the performance requirements of the actual operational region. The core of the PNT Module is a PNT Unit. This PNT Unit is a processing system, which combines by means of sensor and data fusion methods all available PNT sensors. The PNT Module is on the one hand part of the integrated PNT System and on the other hand part of the on- board INS. After a short discussion of the sensors of a PNT Module we have introduced a preliminary integrity monitoring concept for a PNT Module. In a first step towards the development of a PNT Module demonstrator system we have performed first measurement campaigns and derived PNT output data from different sensors. The analysis of these data shows, that for their usage within compatibility tests, the different locations of the sensors onboard the vessel needs to be considered.