© David Last 14 January 2009 Royal Ulster Yacht Club Satellite Navigation – Truths & Myths? Professor David Last Picture: earthobservatory.nasa. gov//ewsroom/BlueMarble/

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Satellite Navigation – Truths & Myths

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Presentation transcript:

© David Last 14 January 2009 Royal Ulster Yacht Club Satellite Navigation – Truths & Myths? Professor David Last Picture: earthobservatory.nasa. gov//ewsroom/BlueMarble/ The Future of Cruising

From: Kelvin Hughes Ltd.

From: May, V., The first handheld aviation navigator, Navigation News Nov/Dec 2001, pp8-9..

From:

From: Simmons, Practical applications of GPS for GIS and civil engineering, Suppl. To Civil Engineering, 114, Sp. Issue 2, pp30-34.

Photo: Ashtech Inc., Optron Pty.

From:

Contents: and

© David Last Picture:

© David Last GPS is perfect … isnt it?

Copyright: Dan Brown 2003 © David Last Captain Fache plants a battery-sized GPS dot in Langdons pocket to track his location, wherever he is, accurate to 2 feet. Its tiny! Its amazingly accurate! It works indoors!

© David Last What could possibly go wrong? Satellite and control system failures Solar flares Unintentional interference Intentional jamming Spoofing (and meaconing) Well, for a start, lets think about …

© 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 Picture: Ashtech, Inc. Picture: Kelvin Hughes Ltd.

© David Last Picture: Professor Durk van Willigen GPS satellite radiates 100W From 20,000km range Illuminates 38% of Earth eg Europe + Africa + Atlantic

© David Last Solar flares

Threat of unintentional interference and jamming Risks can be reduced but not eliminated Consequences severe for safety, economic damage Tempting target for those hostile to the US Can be spoofed to give misleading information Need backup system in critical applications

Source: Clynch et al, Multiple GPS RFI Sources in a Small California Harbor, ION GPS02, Portland OR.

© David Last Picture:

Dice is 1mW GPS jammer

Pictures:

© David Last Jamming Notice to Airmen (NOTAM): AC JUL ft (A1063/02pt) 08 JUL ft (A1063/02pt) GPS Jamming Activity 5555N 00550W rad 320nm.

© David Last Spoofing US Government Volpe Report, on Spoofing: Cause a … GPS receiver to lock onto legitimate-appearing false signals. Spoofing … will inject hazardously misleading information. (And, if not) … will …create significant … errors, and jam large areas … A spoofer also can defeat nearly all anti-jamming equipment. And then theres … Meaconing: receive, delay, and rebroadcast signals to confuse a user.

Picture: / British ship is sunk by Chinese in international waters. Clue is fake GPS signal controlled by techno-terrorist. Bond discovers GPS device - and wins the girl! © David Last

From:

© David Last Pictures: Mitchell Narins, Federal Aviation Administration; Reelektronika bv Enhanced Loran (eLoran) On earth, high-powered Different from GPS! Digital 10m accuracy, precise time

© David Last

Picture: Mitchell Narins, US Federal Aviation Administration

Picture: europa.eu.int/comm/dgs/energy_transport/galileo/intro/index_en.htm

© David Last, University of Wales, Bangor GALILEO European Satellite Navigation System Whats new? Real-time integrity - warning of failure Legal service guarantees Multi-nation control Commercial service-provider Civil, not military

Technically compatible More satellites Higher accuracy … plus …? Picture: europa.eu.int/comm/dgs/energy_transport/galileo/intro/index_en.htm Galileo plus GPS

Picture: europa.eu.int/comm/dgs/energy_transport/galileo/intro/index_en.htm Galileo plus GPS Technically compatible More satellites Higher accuracy plus: GLONASS (Russia) Compass-Beidou (China) QZSS (Japan)

© David Last GPS + Galileo + the rest A secure eLoran terrestrial backup Accurate and robust Navigation So … where are we headed?