Transcript No Slide Title

eLoran –
Now delivering resilient PNT
Professor David Last
Strategic Advisor, General Lighthouse Authorities
of the United Kingdom and Ireland
GNSS Vulnerability: Countering the threat
13 February 2013
National Physical Laboratory
Picture: earthobservatory.nasa.
gov//ewsroom/BlueMarble/
© David Last
Dover Strait – 28 days’ traffic records
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.
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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: General Lighthouse Authorities of the UK & Ireland
© David Last
eLoran –
Now delivering resilient PNT
Professor David Last
Strategic Advisor, General Lighthouse Authorities
of the United Kingdom and Ireland
GNSS Vulnerability: Countering the threat
13 February 2013
National Physical Laboratory
Picture: earthobservatory.nasa.
gov//ewsroom/BlueMarble/
© David Last
The GLAs’ prototype eLoran system is on the air
Runs continuously; available since May 2010;
10-20m accuracy in ports with differential service (green area)
The GLAs’ prototype eLoran system is on the air
- serving the Port of Dover
and the UK section of the Dover Strait
First stage eLoran Initial Operational Capability (IOC)
Pictures: www.poferries.com
Differential eLoran for Port Approaches
with 10metre (95%) signal-in-space accuracy
• Map Additional Secondary Factors (ASFs) of signals
• Measure real-time signal variations at Reference Station
• Send corrections to receivers over eLoran data channel
Differential Reference Station
at the port of Dover
Pictures:
www.reelektronika.nl
eLoran Antenna and Receiver on Ship
- with a scatter plot of positions and a heading display
Pictures: www.reelektronika.nl
Generations of Loran
eLoran and eChayka offer:
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Compatibility between them to serve the high north
Modern transmitting stations and procedures
Advanced receivers that track all stations in view
High precision in ports
A data channel
Table: www.gla-rrnav.org/file.html?file=652be60e268e09c0d91c5b6a976fbc30
© David Last
The GLAs’ prototype eLoran system now provides
precise telecommunications timing
across the UK and Ireland
Picture: www.ursanav.com
The GLAs’ prototype eLoran system now provides
precise telecommunications timing
across the UK and Ireland
… plus secure data, with
road vehicle tracking planned.
Picture: www.ursanav.com
Timing & Data Transmissions from US Loran facilities
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Renaissance of US low frequency solutions
US Coast Guard and UrsaNav co-operate
‘Skyfree’ timing from Loran facility
Much faster Loran data channel
Received indoors
Pictures: www.ursanav.com
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Replace Loran-C with new eLoran
Re-use Loran-C stations
Serve shipping
Serve telecomms timing
Serve secure data
Serve land transport
Share costs
Maximise Loran-C payback