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

Reelektronika’s Integrated
Loran-C/GPS/Eurofix receiver
- early test results
ir. Arthur Helwig
Dr.
Reelektronika, Netherlands
ILA 2003
Boulder, Colorado, USA, 3-7 November 2003
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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PhD Arthur & Gerard, 13 Oct 2003
Thank you!
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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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
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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Measurement vessel
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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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
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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Picture of set-up
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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Map of test area
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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NELS 100m
coverage (95%)
Tests were performed at
boundary of NELS coverage
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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Modes of position calculation
1.
2.
3.
4.
5.
6.
7.
•
•
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
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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Station availability
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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Tracked Loran-C stations
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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Modes of operation
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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Track plots
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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Sailing under a powerline
• Powerline approx. 75
meters high
• High voltage
• No noticeable influence
on receiver performance
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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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 (onship 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)
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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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
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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Signal Processor
77 x 51 mm
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Monitor set-up at
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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Demonstration
Arthur Helwig, ILA 32, November 4-7, Boulder, CO
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