Test of Seres receiver using Test of Seres receiver using EGNOS signalEGNOS signal

Joanna Czapska

joanna.czapska@gmail.com

Warsaw University of Technology

Faculty of Geodesy and Cartography

Seres receiverSeres receiver

The Seres receiverThe Seres receiver

Uses a new GPS engineUses a new GPS engine

Cooperates with EGNOS, WAAS, Cooperates with EGNOS, WAAS, MSAS satellite systemsMSAS satellite systems

Two modes of operation:Two modes of operation:• With EGNOS correctionWith EGNOS correction• Without EGNOS correctionWithout EGNOS correction

Description of the testDescription of the test

First part static surveying in WarsawFirst part static surveying in Warsaw• One measurement siteOne measurement site

Second part static surveying in Second part static surveying in JózefosławJózefosław• Four measurement sitesFour measurement sites

Data received in the first partData received in the first part

Obtained ∆x, ∆y and ∆hObtained ∆x, ∆y and ∆h

From these calculated RFrom these calculated R22 and R and R33

222

3

222

hyxR

yxR

Graph IGraph I

RR2 variation in time with EGNOS correction and without the correction

Graph IIGraph II

RR3 variation in time with EGNOS correction and without the correction

Comparison of average distances RComparison of average distances R22 and R and R33

Measurement R2 avg, /m/ R3 avg. /m/

With EGNOS 1,4384 3,0558

Without EGNOS 1,5884 3,0892

Difference 0,1500 0,0334

ResultsResults

ResultsResults

Comparison of standard deviations RComparison of standard deviations R22 and R and R33

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

Comparison of σ-errors for RComparison of σ-errors for R2 2

(68%-σ, 95%-2σ, 99%-3σ)(68%-σ, 95%-2σ, 99%-3σ)

Surveing with EGNOS correctionSurveing with EGNOS correction Surveing without EGNOS correctionSurveing without EGNOS correction

Comparison of σ-errors for RComparison of σ-errors for R22

σ 2σ 3σ

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

Comparison of σ-errors for RComparison of σ-errors for R33

σ 2σ 3σ

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

Results - SummaryResults - Summary

RR22 RR33

Influence of Influence of EGNOS correction EGNOS correction on the on the measurements. measurements. Calculated for (3σ)Calculated for (3σ)

28,2% 28,2% (better (better measurement measurement results with results with

EGNOS correction)EGNOS correction)

39,8% 39,8% (better (better measurement measurement results with results with

EGNOS correction)EGNOS correction)

Data received in the second partData received in the second part Obtained geographical coordinates: B, L, H (four Obtained geographical coordinates: B, L, H (four

points A, B, C and D)points A, B, C and D)

Astrogeodetic Observatory in Józefosław

Astrogeodetic Obserwatory in Józefosław

Comparison of σ-errors for RComparison of σ-errors for R22

Differences of the results with EGNOS and without Differences of the results with EGNOS and without EGNOS correctionEGNOS correction

σσ 2σ2σ 3σ3σ

Site ASite A 0,07110,0711 0,46770,4677 0,50830,5083

Site BSite B 0,01550,0155 -0,4611 -0,4611 (worse (worse measurement measurement results with results with EGNOS EGNOS correction)correction)

-0,4648 -0,4648 (worse (worse measurement measurement results with results with EGNOS EGNOS correction)correction)

Site CSite C 0,01610,0161 0,23900,2390 0,24410,2441

Site DSite D 0,21900,2190 2,10802,1080 2,16342,1634

Comparison of σ-errors for RComparison of σ-errors for R33

Differences of the results with EGNOS and without Differences of the results with EGNOS and without EGNOS correctionEGNOS correction

σσ 2σ2σ 3σ3σ

Site ASite A 0,44180,4418 0,76430,7643 0,74770,7477

Site BSite B 0,00500,0050 0,07230,0723 0,12200,1220

Site CSite C 1,18071,1807 1,33071,3307 1,30971,3097

Site DSite D 0,35740,3574 3,39573,3957 3,48313,4831

Results - Summary Results - Summary

Influence of EGNOS correction in percents. Influence of EGNOS correction in percents. Calculated for 3σCalculated for 3σ

R2R2 R3 R3

Site ASite A 41,5%41,5% 42,5%42,5%

Site BSite B -75,4%-75,4%(worse measurement result (worse measurement result with EGNOS correction)with EGNOS correction)

9,2%9,2%

Site CSite C 21,1%21,1% 53,2%53,2%

Site DSite D 72,5%72,5% 75,8%75,8%

Site A coordinates obtained Site A coordinates obtained with EGNOS with EGNOS correctioncorrection and and without this correctionwithout this correction

Site A

-1,4

-1,2

-1

-0,8

-0,6

-0,4

-0,2

0

0,2

0,4

-0,6 -0,5 -0,4 -0,3 -0,2 -0,1 0 0,1 0,2 0,3

[m]

[m]

Without EGNOS

H=1,04 m

True coordinates

H=0,00 m

With EGNOS

H=0,70m

Site B coordinates obtained Site B coordinates obtained with EGNOS with EGNOS correctioncorrection and and without this correctionwithout this correction

Site B

-1

-0,5

0

0,5

1

1,5

2

2,5

3

-1,3 -1,1 -0,9 -0,7 -0,5 -0,3 -0,1 0,1 0,3

[m]

[m]

Without EGNOS

H=0,89 m

True coordinates

H=0,00 m

With EGNOS

H=1,07m

Site C coordinates obtained Site C coordinates obtained with EGNOS with EGNOS correctioncorrection and and without this correctionwithout this correction

-0,8

-0,6

-0,4

-0,2

0

0,2

0,4

-3,2 -2,7 -2,2 -1,7 -1,2 -0,7 -0,2 0,3

Site C

-0,8

-0,6

-0,4

-0,2

0

0,2

0,4

-3,2 -2,7 -2,2 -1,7 -1,2 -0,7 -0,2 0,3

[m]

[m]

Without EGNOS

H=0,68 m

True coordinates

H=0,00 m

With EGNOS

H=0,37m

Site D coordinates obtained Site D coordinates obtained with EGNOS with EGNOS correctioncorrection and and without this correctionwithout this correction

Site D

-0,8

-0,6

-0,4

-0,2

0

0,2

0,4

-2,2 -1,7 -1,2 -0,7 -0,2 0,3

[m]

[m]

Without EGNOS

H=1,28 m

With EGNOS

H=1,01m

True coordinates

H=0,00 m

ConclusionConclusion

EGNOS correction improves accuracy EGNOS correction improves accuracy of the measurements.of the measurements.

The Seres receiver has very fast The Seres receiver has very fast start-up and acquisition times.start-up and acquisition times.• It is very handy and easy to transport It is very handy and easy to transport • It is very easy to useIt is very easy to use

Thank YouThank You Have a nice Have a nice

day.day.