Transcript Operating a prototype eLoran System in the UK 463 Republic of

Operating a
Prototype eLoran System
in the UK
Professor David Last
Strategic Advisor
General Lighthouse Authorities of the
United Kingdom and Ireland (GLAs)
eLoran Workshop
Incheon, ROK
9 July 2013
Picture: earthobservatory.nasa.
gov//newsroom/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
On 28 February 2013, the Trinity House Vessel Galatea reverted
automatically to eLoran when GPS was jammed. Galatea
continued seamlessly on track, reporting eLoran positions to
nearby ships and the Vessel Traffic Service ashore.
Picture: General Lighthouse Authorities of the UK & Ireland
© David Last
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 Initial Operational Capability
• These 7 ports are now being
equipped with differential
eLoran of approximately
10 metre port approach
accuracy
• An ASF survey is conducted
at each port and a reference
station is installed
• IMO set standards of accuracy,
integrity, availability and
continuity
eLoran can also support Land Vehicle Telematics
Pictures: www.vehicletrackingltd.co.uk, www.olmc.eu,blogs.guardian.co.uk
© David Last
Pictures: cambridgeconsultants.com, www.readio.com/new-yorkhotel/pictures/warwick-hotel-new-york-city-pictures.jpg
Timing & Data Transmissions from US Loran facilities
• 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
© David Last
Pictures: gpsworld.com, popularmechanics.com,
insidegnss.com, mccain.senate.gov
Teresa M Takai
Chief Information Officer,
US Department of Defense
Washington, 19 April 2013
“… we are … interested in evaluating ... signals outside the US
from … eLoran stations operated by foreign nations … to
complement timing signals from … GPS. With the power and
range of its signals, eLoran presents the potential for maintaining
timing fidelity … in wide regions of the globe where the DoD
conducts operations.”
Picture: http://www.defense.gov/bios/biographydetail.aspx?biographyid=273
Far East Radio Navigation Service (FERNS)
Japan: No jamming! No plans for
terrestrial systems! Close all Loran-C
stations by 2015.
South Korea: Implement eLoran
with national coverage from 5 stations.
Russia: New transmissions from
Ussurijsk. Studying eLoran (eChayka).
China: Not known!
The Route to eLoran
Japan
USA
Russia
ROK
UK
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Prototype is demonstrating eLoran
The best is yet to come
eLoran is not difficult
You will succeed!