© David Last The Need for R esilient PNT at Sea Professor David Last Strategic Advisor, General Lighthouse Authorities of the United Kingdom and Ireland.

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Presentation transcript:

© David Last The Need for R esilient PNT at Sea Professor David Last Strategic Advisor, General Lighthouse Authorities of the United Kingdom and Ireland Picture: earthobservatory.nasa. gov//ewsroom/BlueMarble/ Resilient PNT Demonstrations 25 February – 1 March 2013 Harwich

Dover Strait – 28 days traffic records

© David Last Satellite and Control System Failures Official announcement: "A significant GPS anomaly occurred on 1 Jan 04, beginning at approximately 1833Z... (which) … affected precise timing and navigation users over large portions of Europe, Africa, Asia, Australia, and … North America … and resulted in the transmission of Hazardously Misleading Information." Sources: Vogel, Macabiau & Suard, Effect of a GPS Anomaly on Different GNSS Receivers, ION GNSS 2005, Long Beach, CA, Sep 13-16, 2005, Hoppe & Walterfang, Investigation of a GPS Satellite Problem with respect to DGPS and GPS users, European Journal of Navigation, May 2004, SVN23 clock failure

© David Last Solar flares

© David Last Picture:

A small jammer on this cliff-top disrupted GPS on vessels out to ranges as wide as the Dover Strait

© David Last Low-powered GPS jammer on ship Jammer of less than 1 milliWatt: False positions, and velocities Autopilot may turn vessel But no alarms! With a little more jammer power: Electronic Chart Displays Autopilot Automatic Identification System Differential GPS Satellite voice and data comms Maritime distress safety system plus … Ships Radar & Gyrocompass

© David Last xx Pictures: Jammers like this on our streets can block all frequencies of GPS, GLONASS, Compass-Beidou and Galileo, plus the QZSS, GAGAN, WAAS and EGNOS augmentation systems.

Frequency bands shared by multiple GNSSS transmissions Jammers spectrum affects GPS, Galileo, Compass and GLONASS

© David Last Picture: STAVOG Final Report, courtesy Spirent plc

© David Last Picture: General Lighthouse Authorities of the UK & Ireland

Picture based on:

© David Last The Need for R esilient PNT at Sea Professor David Last Strategic Advisor, General Lighthouse Authorities of the United Kingdom and Ireland Picture: earthobservatory.nasa. gov//ewsroom/BlueMarble/ Resilient PNT Demonstrations 25 February – 1 March 2013 Harwich