Test of Seres receiver using EGNOS signal

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Test of Seres receiver using EGNOS signal
Joanna Czapska joanna.czapska_at_gmail.com Warsaw
University of Technology Faculty of Geodesy and
Cartography
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Seres receiver
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The Seres receiver

• Uses a new GPS engine
• Cooperates with EGNOS, WAAS, MSAS satellite
  systems
• Two modes of operation
• With EGNOS correction
• Without EGNOS correction

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Description of the test

• First part static surveying in Warsaw
• One measurement site
• Second part static surveying in Józefoslaw
• Four measurement sites

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Data received in the first part

• Obtained ?x, ?y and ?h
• From these calculated R2 and R3

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Graph I
R2 variation in time with EGNOS correction and
without the correction
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Graph II
R3 variation in time with EGNOS correction and
without the correction
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Results

• Comparison of average distances R2 and R3

Measurement R2 avg, /m/ R3 avg. /m/
With EGNOS 1,4384 3,0558
Without EGNOS 1,5884 3,0892
Difference 0,1500 0,0334
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Results

• Comparison of standard deviations R2 and R3

Measurement Std. Dev. for R2 avg, /m/ Std. Dev. for R3 avg, /m/
With EGNOS 0,8225 1,7201
Without EGNOS 0,9996 2,0057
Difference 0,1771 0,2856
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Comparison of s-errors for R2 (68-s,
95-2s, 99-3s)
Surveing with EGNOS correction
Surveing without EGNOS correction
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Comparison of s-errors for R2
s 2s 3s
Radius value /m/ Measurement with EGNOS 1,7219 3,4500 5,0041
Radius value /m/ Measurement without EGNOS 1,8109 3,5263 6,9702
Difference 0,0890 0,0763 1,9661
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Comparison of s-errors for R3
s 2s 3s
Radius value /m/ Measurement with EGNOS 3,0164 6,7479 10,1639
Radius value /m/ Measurement without EGNOS 3,5300 7,0505 16,8769
Difference 0,5136 0,3026 6,7130
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Results - Summary
R2 R3
Influence of EGNOS correction on the measurements. Calculated for (3s) 28,2 (better measurement results with EGNOS correction) 39,8 (better measurement results with EGNOS correction)
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Data received in the second part

• Obtained geographical coordinates B, L, H (four
  points A, B, C and D)

Astrogeodetic Obserwatory in Józefoslaw
Astrogeodetic Observatory in Józefoslaw
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Comparison of s-errors for R2
Differences of the results with EGNOS and without EGNOS correction Differences of the results with EGNOS and without EGNOS correction Differences of the results with EGNOS and without EGNOS correction Differences of the results with EGNOS and without EGNOS correction
s 2s 3s
Site A 0,0711 0,4677 0,5083
Site B 0,0155 -0,4611 (worse measurement results with EGNOS correction) -0,4648 (worse measurement results with EGNOS correction)
Site C 0,0161 0,2390 0,2441
Site D 0,2190 2,1080 2,1634
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Comparison of s-errors for R3
Differences of the results with EGNOS and without EGNOS correction Differences of the results with EGNOS and without EGNOS correction Differences of the results with EGNOS and without EGNOS correction Differences of the results with EGNOS and without EGNOS correction
s 2s 3s
Site A 0,4418 0,7643 0,7477
Site B 0,0050 0,0723 0,1220
Site C 1,1807 1,3307 1,3097
Site D 0,3574 3,3957 3,4831
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Results - Summary
Influence of EGNOS correction in percents. Calculated for 3s Influence of EGNOS correction in percents. Calculated for 3s Influence of EGNOS correction in percents. Calculated for 3s
R2 R3
Site A 41,5 42,5
Site B -75,4 (worse measurement result with EGNOS correction) 9,2
Site C 21,1 53,2
Site D 72,5 75,8
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Site A coordinates obtained with EGNOS correction
and without this correction
True coordinates H0,00 m
With EGNOS H0,70m
Without EGNOS H1,04 m
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Site B coordinates obtained with EGNOS
correction and without this correction
Without EGNOS H0,89 m
With EGNOS H1,07m
True coordinates H0,00 m
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Site C coordinates obtained with EGNOS correction
and without this correction

True coordinates H0,00 m
With EGNOS H0,37m
Without EGNOS H0,68 m
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Site D coordinates obtained with EGNOS correction
and without this correction
Without EGNOS H1,28 m
True coordinates H0,00 m
With EGNOS H1,01m
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Conclusion

• EGNOS correction improves accuracy of the
  measurements.
• The Seres receiver has very fast start-up and
  acquisition times.
• It is very handy and easy to transport
• It is very easy to use

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Thank You

• Have a nice day.