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Reelektronika’s Integrated Loran-C/GPS/Eurofix receiver - early test results

Reelektronika’s Integrated Loran-C/GPS/Eurofix receiver - early test results. Dr. Arthur Helwig Reelektronika, Netherlands ILA 2003 Boulder, Colorado, USA, 3-7 November 2003. ir. Dr. PhD Arthur & Gerard, 13 Oct 2003. Thank you!. Marine trials.

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Reelektronika’s Integrated Loran-C/GPS/Eurofix receiver - early test results

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  1. Reelektronika’s IntegratedLoran-C/GPS/Eurofix receiver- early test results Dr. Arthur Helwig Reelektronika, Netherlands ILA 2003 Boulder, Colorado, USA, 3-7 November 2003 ir. Dr.

  2. PhD Arthur & Gerard, 13 Oct 2003 Thank you!

  3. 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. Measurement vessel

  5. 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. Picture of set-up

  7. Map of test area

  8. NELS 100m coverage (95%) Tests were performed at boundary of NELS coverage

  9. Modes of position calculation • DGPS, SPS Radiobeacon mode • DPGS, SPS Eurofix mode • GPS, SPS mode • Loran-C, DGPS calibrated mode • Loran-C, ASF-table calibrated mode • Loran-C, stand-alone mode • Fix not available • Simultaneous output of selected modes • Automatic mode

  10. Station availability

  11. Tracked Loran-C stations

  12. Modes of operation

  13. Track plots

  14. Sailing under a powerline • Powerline approx. 75 meters high • High voltage • No noticeable influence on receiver performance

  15. 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. Signal Processor77 x 51 mm Tasks at hand When we… • Finalise tracking & positioning code • Port all software code to DSP board • Finish antenna production … we’ll have a functional small receiver in Q1 2004

  17. Monitor set-up at

  18. Demonstration

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