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© David Last
14 January 2009Royal Ulster Yacht Club
Satellite Navigation – Truths & Myths?
Professor David Last
Picture: earthobservatory.nasa.gov//ewsroom/BlueMarble/
The Future of Cruising
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From: Kelvin Hughes Ltd.
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From: May, V., ‘The first handheld aviation navigator’, Navigation News Nov/Dec 2001, pp8-9..
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From: www.garmin.com/marine
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From: Simmons, ‘Practical applications of GPS for GIS and civil engineering’, Suppl. To Civil Engineering, 114, Sp. Issue 2, pp30-34.
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Photo: Ashtech Inc., Optron Pty.
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From: www.cellphonesforbusiness.com/ www.samsung.com
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Contents: www.cellpoint.com/Presentation/CellPoint-LondonMLSOctober2002.pdf and http://www.telecomsys.com/
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© David Last
Picture: www.flickr.com/photos/guyburns/1878598347www.skyscrapercity.com/showthread.php?t=383984&page=3/
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© David Last
GPS is perfect …
isn’t it?
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Copyright: Dan Brown 2003
© David Last
Captain Fache plants abattery-sized GPS dot inLangdon’s pocket to trackhis location, wherever he is,accurate to 2 feet.It’s tiny!It’s amazingly accurate!It works indoors!
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© 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, let’s think about …
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© David Last
Satellite and Control System Failures
Official announcement:"A significant GPS anomaly occurred on 1 Jan 04, beginning at approximately1833Z ... (which) … affected precise timing and navigation users over largeportions of Europe, Africa, Asia, Australia, and … North America … and resultedin 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,www.lr.tudelft.nl/live/pagina.jsp?id=400f4487-ed8c-4274-95cb-ebc2afa7385e&lang=en
SVN23 clock failure
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© David Last
Picture: Ashtech, Inc.
Picture: Kelvin Hughes Ltd.
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© David Last
Picture: Professor Durk van Willigen
• GPS satellite radiates 100W
• From 20,000km range
• Illuminates 38% of Earth
• eg Europe + Africa + Atlantic
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© David Last
Solar flares
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• 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
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Source: Clynch et al, ‘Multiple GPS RFI Sources in a Small California Harbor’, ION GPS02, Portland OR.
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© David Last
Picture: www.flickr.com/photos/l23productions/1451697290/
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Dice is 1mW GPS jammer
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Pictures: www.redferret.net/?p=7864
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© David Last
Jamming
Notice to Airmen (NOTAM): AC 555507 JUL 1100-1400 30000ft (A1063/02pt)08 JUL 0715-1015 30000ft (A1063/02pt)GPS Jamming Activity 5555N 00550W rad 320nm.
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© 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 there’s …
• Meaconing: receive, delay, and rebroadcast signals to confuse a user.
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Picture: /www.imdb.com/title/tt0120347, www.naval-technology.com/projects/t23/
• 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
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© David Last
From: www.cil.ie
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© 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
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© David Last
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Picture: Mitchell Narins, US Federal Aviation Administration
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Picture: europa.eu.int/comm/dgs/energy_transport/galileo/intro/index_en.htm
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© David Last, University of Wales, Bangor
GALILEOEuropean Satellite NavigationSystem
What’s new?
• Real-time integrity - warning of failure• Legal service guarantees• Multi-nation control• Commercial service-provider• Civil, not military
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• Technically compatible • More satellites• Higher accuracy
… plus …?
Picture: europa.eu.int/comm/dgs/energy_transport/galileo/intro/index_en.htm
Galileo plus GPS
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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)
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© David Last
• GPS + Galileo + the rest• A secure eLoran terrestrial backup• Accurate and robust Navigation
So … where are we headed?