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Arthur Helwig, ILA 32, November 4-7, Boulder, CO1 reelektronika Reelektronikas Integrated Loran-C/GPS/Eurofix receiver - early test results Dr. Arthur.

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Presentation on theme: "Arthur Helwig, ILA 32, November 4-7, Boulder, CO1 reelektronika Reelektronikas Integrated Loran-C/GPS/Eurofix receiver - early test results Dr. Arthur."— Presentation transcript:

1 Arthur Helwig, ILA 32, November 4-7, Boulder, CO1 reelektronika Reelektronikas Integrated Loran-C/GPS/Eurofix receiver - early test results Dr. Arthur Helwig Reelektronika, Netherlands ILA 2003 Boulder, Colorado, USA, 3-7 November 2003 Dr. ir.

2 Arthur Helwig, ILA 32, November 4-7, Boulder, CO2 reelektronika PhD Arthur & Gerard, 13 Oct 2003 Thank you!

3 Arthur Helwig, ILA 32, November 4-7, Boulder, CO3 reelektronika Marine trials Trials to assess an integrated GPS/Eurofix receiver Out of the Eckernförde harbor, using a small (30 ft) vessel Two trial runs: –10/12 June 2003 –9/10 Oct 2003 Third trial scheduled for January 2004

4 Arthur Helwig, ILA 32, November 4-7, Boulder, CO4 reelektronika Measurement vessel

5 Arthur Helwig, ILA 32, November 4-7, Boulder, CO5 reelektronika Measurement set-up Old version Loradd receiver Performs: -Bandpass filtering -Cross-rate filtering Outputs: -Eurofix datalink information -Cleaned up pulses for every tracked Loran-C station PC running Matlab Performs: -ECD measurement -Cycle identification -Range calculation, using ASF and/or GPS calibration Outputs: -Positions calculated in a number of modes NovAtel OEM4 GPS receiver Laptop for display of data

6 Arthur Helwig, ILA 32, November 4-7, Boulder, CO6 reelektronika Picture of set-up

7 Arthur Helwig, ILA 32, November 4-7, Boulder, CO7 reelektronika Map of test area

8 Arthur Helwig, ILA 32, November 4-7, Boulder, CO8 reelektronika NELS 100m coverage (95%) Tests were performed at boundary of NELS coverage

9 Arthur Helwig, ILA 32, November 4-7, Boulder, CO9 reelektronika Modes of position calculation 1.DGPS, SPS Radiobeacon mode 2.DPGS, SPS Eurofix mode 3.GPS, SPS mode 4.Loran-C, DGPS calibrated mode 5.Loran-C, ASF-table calibrated mode 6.Loran-C, stand-alone mode 7.Fix not available Simultaneous output of selected modes Automatic mode

10 Arthur Helwig, ILA 32, November 4-7, Boulder, CO10 reelektronika Station availability

11 Arthur Helwig, ILA 32, November 4-7, Boulder, CO11 reelektronika Tracked Loran-C stations

12 Arthur Helwig, ILA 32, November 4-7, Boulder, CO12 reelektronika Modes of operation

13 Arthur Helwig, ILA 32, November 4-7, Boulder, CO13 reelektronika Track plots

14 Arthur Helwig, ILA 32, November 4-7, Boulder, CO14 reelektronika Sailing under a powerline Powerline approx. 75 meters high High voltage No noticeable influence on receiver performance

15 Arthur Helwig, ILA 32, November 4-7, Boulder, CO15 reelektronika Early conclusions Operational fully automatic receiver –GPS –Autonomous Loran-C –ASF-corrected Loran-C –GPS-calibrated Loran-C Even under sub-optimal conditions, first track results look promising Work to be done: –Implement advanced RF interference mitigation (on- ship power generator was suspect) –Implement of H-field antenna compensation –Check cycle ID / ECD measurement algorithms –Automatic station selection (to be used in position calculation algorithm)

16 Arthur Helwig, ILA 32, November 4-7, Boulder, CO16 reelektronika Tasks at hand Signal Processor 77 x 51 mm When we… Finalise tracking & positioning code Port all software code to DSP board Finish antenna production … well have a functional small receiver in Q1 2004

17 Arthur Helwig, ILA 32, November 4-7, Boulder, CO17 reelektronika Monitor set-up at

18 Arthur Helwig, ILA 32, November 4-7, Boulder, CO18 reelektronika Demonstration


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