The Effect of SLR Tracking Scenarios to GNSS Satellites in ...€¦ · Kiev Komsomolsk Matera McDonald Monument Peak Mount Stromlo Potsdam San Juan Shanghai Simeiz Simosato Svetloe

Astronomical Institute University of Bern

Astronomical Institute, University of Bern, Switzerland

22th International Workshop on Laser Ranging

November 5th, 2018

JCSMR Canberra, Australia

The Effect of SLR Tracking Scenarios to GNSS Satellites in a Combined GNSS/SLR Solution

F. Andritsch, R. Dach, T.Schildknecht, U. Meyer, A. Jäggi

21st International Workshop on Laster RangingNovember 5th, 2018

JCSMR Canberra, Australia

Slide 2 Astronomical Institute University of Bern

Contents

• Introduction

• Combining SLR+GNSS using space ties

• Simulation setup

• Tracking scenarios

• Real ILRS tracking activities to GLONASS

• Alternative tracking strategies

• Results

• Comparing five different realistic scenarios

• Conclusions and Outlook

• References

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The e

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SLR

tra

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NSS s

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Introduction - Combining SLR+GNSS using space ties

• Creating a 7-day combined solution from microwave and SLR

• Weighting observations SLR:GNSS with 2000:1

Flo

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The e

ffect

of

SLR

tra

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gscenari

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toG

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ate

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in a

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GN

SS/SLR

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1-day NEQ from GNSS + 1-day NEQ from SLR

Combine to 7-day NEQ7X

7-day SLR to LAGEOS andEtalon NEQ

7-day combinedSLR+GNSS+LAGEOS NEQ


Introduction – Simulation Setup

• Simulated NPs based on

• 3D distance between station and satellite at given epoch

• Satellite and station specific pseudo random noise

• Alternative scenarios

• Based on real tracking activities of ILRS stations in given year

• Epochs remain the same, targets exchanged

• Concept of an altered ILRS priority list

Flo

rian A

ndri

tsch:

The e

ffect

of

SLR

tra

ckin

gscenari

os

toG

NSS s

ate

llit

es

in a

com

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ed

GN

SS/SLR

solu

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Tracking scenarios – Real tracking activity in 2014 (REAL)

Flo

rian A

ndri

tsch:

The e

ffect

of

SLR

tra

ckin

gscenari

os

toG

NSS s

ate

llit

es

in a

com

bin

ed

GN

SS/SLR

solu

tion

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• Year 2014

• 6 prioritizedGLONASS

• Typical week

• Huge differences


Tracking scenarios – Alternative Scenarios

• All GLONASS with equal priority (allGLONASS)

Flo

rian A

ndri

tsch:

The e

ffect

of

SLR

tra

ckin

g s

cenari

os t

o G

NSS s

ate

llit

es in a

com

bin

ed G

NSS/SLR

solu

tion

22

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onal W

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Novem

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a, A

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Flo

rian A

ndri

tsch:

The e

ffect

of

SLR

tra

ckin

gscenari

os

toG

NSS s

ate

llit

es

in a

com

bin

ed

GN

SS/SLR

solu

tion

22

thIn

tern

ati

onal W

ork

shop o

n L

aser

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Fra

cti

on

of

tota

l N

Ps

AltayArequipaArkhyzBadaryBaikonurBeijingBrasiliaChangchunDaejonGrasseGrazGreenbeltHaleakalaHartebeesthoekHerstmonceuxKatzivelyKievKomsomolskMateraMcDonaldMonument PeakMount StromloPotsdamSan JuanShanghaiSimeizSimosatoSvetloeTahitiWettzellYarragadeeZelenchukskayaZimmerwald


Flo

rian A

ndri

tsch:

The e

ffect

of

SLR

tra

ckin

g s

cenari

os t

o G

NSS s

ate

llit

es in a

com

bin

ed G

NSS/SLR

solu

tion

22

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onal W

ork

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Fra

cti

on

of

tota

l N

Ps





• 2 GLONASS per orbital plane (2GLONASS)

• GLONASS tracking to only those satellites

Flo

rian A

ndri

tsch:

The e

ffect

of

SLR

tra

ckin

gscenari

os

toG

NSS s

ate

llit

es

in a

com

bin

ed

GN

SS/SLR

solu

tion

22

thIn

tern

ati

onal W

ork

shop o

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aser

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Novem

ber

5th

20

18

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a, A

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alia

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Flo

rian A

ndri

tsch:

The e

ffect

of

SLR

tra

ckin

g s

cenari

os t

o G

NSS s

ate

llit

es in a

com

bin

ed G

NSS/SLR

solu

tion

22

thIn

tern

ati

onal W

ork

shop o

n L

aser

Rangin

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Fra

cti

on

of

tota

l N

Ps





• 2 GLONASS per orbital plane (2GLONASS)

• GLONASS tracking to only those satellites

• Arranged tracking between European stations (EUROPE)

• Six stations share the 6 prioritized satellites on a bi-weekly basis

• GPS and GLONASS equally (2SYSTEM)

• Simulated retroreflectors on all GPS satellites

Flo

rian A

ndri

tsch:

The e

ffect

of

SLR

tra

ckin

gscenari

os

toG

NSS s

ate

llit

es

in a

com

bin

ed

GN

SS/SLR

solu

tion

22

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Results – Geocenter Coordinates

• LAGEOSdominates

• WeeklyVariationsdominate

• Within5mm ofLAGEOS

Flo

rian A

ndri

tsch:

The e

ffect

of

SLR

tra

ckin

g s

cenari

os t

o G

NSS s

ate

llit

es in a

com

bin

ed G

NSS/SLR

solu

tion

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Results – Station coordinates

Flo

rian A

ndri

tsch:

The e

ffect

of

SLR

tra

ckin

g s

cenari

os t

o G

NSS s

ate

llit

es in a

com

bin

ed G

NSS/SLR

solu

tion

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• Consistent on a milimeter level

• RMS of station coordinates remains similar between all scenariosexcept 2SYSTEM.


Results – Station coordinates

Flo

rian A

ndri

tsch:

The e

ffect

of

SLR

tra

ckin

g s

cenari

os t

o G

NSS s

ate

llit

es in a

com

bin

ed G

NSS/SLR

solu

tion

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Zimmerwald 7810

Form

al Err

ors

Form

al Err

ors

Altay 1879

• Consistent on a milimeter level

• RMS of station coordinates remains similar between all scenariosexcept 2SYSTEM.

• Formal errors:

• More difference forstations withmore NPs

• allGLONASS similarto REAL, lowesterrors


Results – Earth Rotation Parameters

Flo

rian A

ndri

tsch:

The e

ffect

of

SLR

tra

ckin

g s

cenari

os t

o G

NSS s

ate

llit

es in a

com

bin

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NSS/SLR

solu

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• ERPs favour a balanced distribution

• 2SYSTEMS performs worst

• Noisier SLR observations now also affect GPS


Conclusions

• Target selection is not as relevant as the total number and distributionof available NPs

• Station coordinates:

• All scenarios have similar RMS except 2SYSTEMS

• Formal errors correlate with the availability of NPs

• Earth Rotation Parameters:

• Even distribution is beneficial

• Possibly not enough NPs for 2SYSTEM

• Geocenter Coordinates:

• Weekly variations larger than difference between scenarios

• LAGEOS has main contribution

• Improved in all scenarios over GNSS only

Flo

rian A

ndri

tsch:

The e

ffect

of

SLR

tra

ckin

gscenari

os

toG

NSS s

ate

llit

es

in a

com

bin

ed

GN

SS/SLR

solu

tion

22

thIn

tern

ati

onal W

ork

shop o

n L

aser

Rangin

g,

Novem

ber

5th

20

18

, JC

SM

R C

anberr

a, A

ustr

alia

+

Documents

The Effect of SLR Tracking Scenarios to GNSS Satellites in ...€¦ · Kiev Komsomolsk Matera McDonald Monument Peak Mount Stromlo Potsdam San Juan Shanghai Simeiz Simosato Svetloe