Transcript No Slide Title

The Need for
Resilient PNT at Sea
Professor David Last
Strategic Advisor, General Lighthouse Authorities
of the United Kingdom and Ireland
Resilient PNT Demonstrations
25 February – 1 March 2013
Harwich
Picture: earthobservatory.nasa.
gov//ewsroom/BlueMarble/
© David Last
Dover Strait – 28 days’ traffic records
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."
SVN23 clock failure
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,
www.lr.tudelft.nl/live/pagina.jsp?id=400f4487-ed8c-4274-95cb-ebc2afa7385e&lang=en
© David Last
Solar flares
© David Last
Picture: www.flickr.com/photos/l23productions/1451697290/
© David Last
A small jammer on this cliff-top disrupted GPS on vessels
out to ranges as wide as the Dover Strait
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 …
Ship’s Radar & Gyrocompass
© David Last
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.
xx
Pictures: www.jammer-store.com/gj5-gps-l1-l2-l5-jammer-blocker.html
© David Last
Frequency bands shared by
multiple GNSSS transmissions
Jammer’s spectrum affects GPS,
Galileo, Compass and GLONASS
Picture: STAVOG Final Report, courtesy Spirent plc
© David Last
Picture: General Lighthouse Authorities of the UK & Ireland
© David Last
Picture based on: http://www.amcsearch.com.au
The Need for
Resilient PNT at Sea
Professor David Last
Strategic Advisor, General Lighthouse Authorities
of the United Kingdom and Ireland
Resilient PNT Demonstrations
25 February – 1 March 2013
Harwich
Picture: earthobservatory.nasa.
gov//ewsroom/BlueMarble/
© David Last