© David Last, University of Wales, Bangor 31st Annual Convention & Technical Symposium International Loran Association 27-30 October, 2002 Washington,

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Presentation transcript:

© David Last, University of Wales, Bangor 31st Annual Convention & Technical Symposium International Loran Association October, 2002 Washington, DC, USA New ways of looking at Loran-C ASFs Professor David Last Dr. Paul Williams University of Wales

© David Last, University of Wales, Bangor

NELS ASF mapping - principles Calculate ASFs using most sophisticated computer models Measure values precisely at fewest data points Adjust modelled values to fit measured data Model gives detail, measurements remove biases Results validated by measurement programme

© David Last, University of Wales, Bangor

Photo: Norwegian Tourist Board

© David Last, University of Wales, Bangor

Sylt ASFs

© David Last, University of Wales, Bangor Lessay ASFs

© David Last, University of Wales, Bangor

Location of October 2001 Sea Trials

Green: GPS Black: Loran, with and without modelled ASFs

Green: GPS Black: Loran with modelled ASFs

Green: GPS. Black: Loran with modelled ASFs. Orange: Loran with measured ASFs.

Green: GPS. Black: Loran with modelled ASFs. Orange: Loran with measured ASFs.

Non-precision approach to Oslo Gardermoen

© David Last, University of Wales, Bangor Variations of Sylt ASF around Oslo Gardermoen airport (Values in μs; 0.1μs=30m pseudorange)

© David Last, University of Wales, Bangor 439ns =132m 625ns = 187m ASF changes from airfield values over 10km and 20km

© David Last, University of Wales, Bangor ASF changes from airfield values with height

© David Last, University of Wales, Bangor ASF seasonal changes Due to ground conductivity changes Greatest over freeze/thaw paths Temperate areas: 40-70m pseudorange (2-sigma) Ignore seasonal variations in temperate areas Northern Scandinavia: +/-100m pseudorange max Publish updated values here in AIRAC cycle

From: Tech Center Factsheets, US Federal Aviation Administration

Figure: Locus Inc. Landing at Atlantic City. Green: GPS. White: Satmate Loran with airfield ASFs

Figure: Locus Inc. Flying in Chesapeake Bay area, using ASFs from Atlantic City, 200km away

Figure: Locus Inc.

© David Last, University of Wales, Bangor Photo: Norwegian Tourist Board