0302 Ferland - IGS Analysis Center Coordinator (ACC)of the reprocessed IGS Analysis Center ... GPS Week Official Official Repro1. ... gf1 14 914.9 474.7 10 310.3 555.5 11 911.9acc.igs.org/repro1/repro1-combo_IGSW10.pdf ·

IGS10, Newcastle upon Tyne • England , 28 June – 2 July , 2010

Combinationof the reprocessed

IGS Analysis CenterySINEX solutions

Rémi FerlandGeodetic Survey Division


ContentsContents

I d i• Introduction• Contribution• Combined Products:

• Coordinates’• ERP’s

• Apparent Geocenter

• Summary• Summary• Recommandations


Introduction

• Main Objective:– Improve products consistency to better meet users requirements

• Original SINEX products:– AC contribution started in early 1996 (Wk 0837)y ( )– Combinations:

• GNAACs (mit & ncl) combination since 1996• Pilot Project ~1999 (Wks 0999 – 1049)• Official since ~2000 (Wks 1050 – Now)

• Latest SINEX products:– Reprocessed:p

• 1994.0 - 2008.0 (Wks 0730 – 1459)– Official (Included for completeness):

• 2008.0 - 2010.1 (Wks 1460 – 1566)( )


Contributing Agencies

• co[d1] Center for Orbit Determination in Europe University of Bern Switzerland• co[d1] Center for Orbit Determination in Europe, University of Bern, Switzerland• em[r1] Natural Resources, Canada • es[a1] European Space Operations Center, ESA, Germany • gf[z1] GeoForschungsZentrum, Germany• gt1 GeoForschungsZentrum, Germany (Tiga)• jp[l1] Jet Propulsion Laboratory, USA• mi[t1] Massachusetts Institute of Technology, USA (AC + GNAAC)• nc[l1] Newcastle England (GNAAC)nc[l1] Newcastle, England (GNAAC)• ng[s1] National Oceanic and Atmospheric Administration / NGS, USA • pd1 GFZ Potsdam/IPG Dresden, Germany• si[o1] Scripps Institution of Oceanography, USA• ul1 University of La Rochelle, France (Tiga)

11 ACs + 2 GNAACS


Contributed SolutionsAC (11) Software (6) Data span # of Stations Comments

[d1] B 1994 0 2010 0 322 E l d d ERPco[d1] Bernese 1994.0 - 2010.0 322 Excluded ERPs

em[r1] Gipsy 1995.0 - 2010.0 229

es[a1] NAPEOS 1995.0 - 2010.0 418

gf[z1] EPOS 1994.0 - 2010.0 299 Excluded apparent geocentergf[z1] EPOS 1994.0 2010.0 299 Excluded apparent geocenter

gt1 EPOS 1998.0 - 2008.0 390 Excluded apparent geocenter

jp[ll] Gipsy 1996.0 - 2010.0 413

mi[t1] Gamit 1998.0 - 2010.0 700

ng[s1] Page 1995.0 - 2010.0 436 Excluded pole position (1994.0 - 2000.0)

pd1 Bernese 1994.0 - 2008.0 201 Excluded LOD

si[o1] Gamit 1994.0 - 2010.0 422 Excluded pole rate (2008-2010)

ul1 Gamit 1996.0 - 2007.0 275 Excluded apparent geocenter (no ERPs)

GNAAC(2)

MIT 2008.0 - 2010.0 632 Comparison only.

nc[l1] 2000.0 - 2010.0 355 Comparison only


Weekly AC Contributed Solutions

4 ACs Contributed to 1994.0 8 ACs Contributed to 2010 04 ACs Contributed to 1994.0 8 ACs Contributed to 2010.03 ACs Contributed the entire period

Contribution to ITRF2008 (1997.0 – 2009.5) 492 stations


AC Networks (Total # of stations)

co[d1] (322) em[r1] (229) es[a1] (418) gf[z1] (299)

gt1 (390) jp[l1] (413) mi[t1] (700) ng[s1] (436)

pd1 (201) si[o1] (422) ul1 (275)

Grand Total 900 +

IGS10, Newcastle upon Tyne • England , 28 June – 2 July , 2010Stations Usage by the ACsfor at least 2 yearsfor at least 2 years

# ACs (# sta)

▲ 7 – 8 (70)

▲ 9 – 11 (185)

▲ 3 4 (122)

▲ 5 – 6 (81)

▲ 1 – 2 (185)

▲ 3 – 4 (122)

166 in IGS08 (241)84 in IGS08 core (94)

Total 643

_ ( )


Stations Data Span

Years of Data (# sta)

▲ 11.0 – 14.0 (81)

▲ 14.0 – 16.0 (78)

▲ 5 0 8 0 (157)

▲ 8.0 – 11.0 (158)

▲ 2.0 – 5.0 (169)

▲ 5.0 – 8.0 (157)

Total 643


Stations in the IGSWeekl CombinationWeekly Combination

500500

94.0

98.0

02.0

08.0

10.0

00.0

400

450

400

450 199

199

200

200

201

200

1 sta./y

250

300

350

tatio

ns

250

300

350

tatio

ns

150

200

250

# of

St

150

200

250

# of

St

50

100

50

100

Official

0700 800 900 1000 1100 1200 1300 1400 1500 1600

GPS Week

Official0700 800 900 1000 1100 1200 1300 1400 1500 1600

GPS Week

OfficialRepro1


Reference Frame Stations in the Weekly Combinationsthe Weekly Combinations

140140

100

120

100

120

80

100

tatio

ns 80

100

tatio

ns

40

60# of

St

40

60# of

St

20

40

20

40

IGS97 IGS00 IGb00 IGS05To strengthen theFrame Realization

for 1994,5 stations were added:

0700 800 900 1000 1100 1200 1300 1400 1500 1600

GPS Week

0700 800 900 1000 1100 1200 1300 1400 1500 1600

GPS Week

BRMU, FORT, GRAZ,HOLB, KOSG

IGS10, Newcastle upon Tyne • England , 28 June – 2 July , 2010ACs Coordinates Residuals Avg & Std w r t IGS05Avg. & Std. w.r.t. IGS05

NAnnualSignal

Amplitude N

mm

)

m)

p~1mm

Best Consistency:N&E ~2 5mm

Eg. (m

d. (m

05

N&E ~2.5mmH ~ 7mm

E

Avg

Std

IGS0

Older=noisier(solns. & IGS05)

H

Time series shifted by multiples of 3 mm.

IGS10, Newcastle upon Tyne • England , 28 June – 2 July , 2010ACs Coordinates Residuals Avg & Std w r t IGS WeeklyAvg. & Std. w.r.t. IGS Weekly

NN

m)

m)

Best Consistency:

Eg. (m

d. (m

mN&E ~1mmH ~ 2.5 mm

E

Avg

Std

tes

on

Older=noisier

H

AC

dom

inat

com

bina

tio


No

Ath

e

IGS10, Newcastle upon Tyne • England , 28 June – 2 July , 2010ACs Coordinates ResidualsAvg & Std w r t IGS CumulativeAvg. & Std. w.r.t. IGS Cumulative

NAnnualSignal

N

m)

m)

Amplitude~1mm

Best Consistency:

Eg. (m

m

d. (m

myN&E ~ 1.5mm

H ~ 5mmOlder=noisier

E

Avg

Std

Again,

H

g ,Older=noisier



ACs Scale offset

Time series shifted by multiples of 1 ppb.


IGS Scale Offsetb

b/y

e =

0.3p

pb

= -0

.2pp

b0.

000

ppb

Am

plitu

de

Bia

s D

rift ≈

ual s

igna

l AA

nnu

IGS10, Newcastle upon Tyne • England , 28 June – 2 July , 2010AC Apparent Geocenter Weekly Residuals and Formal UncertaintyResiduals and Formal Uncertainty

) mm

)

X

(mm

)

inty

(m

Best Consistency:X&Y ~1mm

Yuals

(

certa

iZ ~ 3mmOlder=noisier

sY

Res

idu

l Unc

C D

omin

ates

ombi

natio

n

Z

R

orm

al

No

AC

the

Co

ng1 A~7mmmi1 A~5mm

Fo


si1 A~15mm

ng1 A~7mm

IGS10, Newcastle upon Tyne • England , 28 June – 2 July , 2010Combined ApparentGeocenter Position w r t IGS05Geocenter Position w.r.t. IGS05

~ W

k 10

50~

5 m

m

YX~

co[d1]

gt1

gf[z1]

es[a1]

em[r1]

[ ]

CACsZ

si[o1]

pd1

ng[s1]

mi[t1]

jp[l1]ACACs

700 800 900 1000 1100 1200 1300 1400 1500 1600

ul1

GPS Week

IGS10, Newcastle upon Tyne • England , 28 June – 2 July , 2010ACs Daily ERPs Residuals w.r.t. the IGS Combinedthe IGS Combined

LOD Xp Yp

Xpr YprXpr YprConsistency:LOD ~ 10µs[XY] 0 03[XY]p ~ 0.03mas[XY]pr ~ 0.10mas/d(Older=noisier)

Time series shifted by multiples of 100µs, 50mas, 100 mas/y


Daily ERPs STD

LOD XPO XPOR YPO YPORem1 25.7 5.7 33.4 7.0 26.6es1 17.3 5.4 21.0 4.8 29.0gf1 14 9 4 7 10 3 5 5 11 9gf1 14.9 4.7 10.3 5.5 11.9gt1 19.2 3.7 13.9 3.8 12.6jp1 23.0 5.5 18.3 4.6 18.2jpmi1 10.0 3.0 13.3 2.6 18.6ng1 17.0 9.0 20.7 7.6 26.6pd1 8.9 20.7 12.0 20.4si1 22.5 7.1 28.6 7.2 31.4

Red = Smallest STDGreen = Largest STD


Pole Position Misclosure at Day Boundary

X 0 10

StdX 0.10 mas

Y 0.11 mas


Pole Position and Rate F l U t i tFormal Uncertainty


Summary (1/2)

• Contributors :– 11 ACs– 2 GNAACs

• Time span:Time span:– Reprocessed: 1994.0 – 2008.0– Official: 2008.0 – 2010.1

N i ifi t di ti it b d t th– No significant discontinuity observed at the reprocessed/Official solutions boundary

• Network:– All contribution : 900 + stations– With 2 years + : 643 stations


Summary (2/2)

• ACs products best consistency:ACs products best consistency: – Coordinates w.r.t.:

IGS05 (N-E ~ 2.5 mm, H ~ 7 mm) IGS Weekly (N-E ~ 1 mm, H ~ 2.5 mm) IGS Cumulative (N-E ~ 2 mm, H ~ 5 mm)

– ERPs:ERPs: LOD ~ 10us ( [XY]p ~ 0.03 mas; [XY]pr ~ 0.10mas/d)

– Geocenter: X & Y ~1 mm Z ~ 3mm– Older (pre-1996) solutions consistency substantially worse


RecommendationsRecommendations

• Improve older combinations (pre-1996)– All Acs should contribute (Half have done it)– More stations … if possible.

• All ACs should contribute all parametersp• All contributed Parameters should be

unconstrained or at least unconstrainable.unconstrained or at least unconstrainable.


Acknowledgements

• Co[d1] Center for Orbit Determination in Europe University of Bern Switzerland• Co[d1] Center for Orbit Determination in Europe, University of Bern, Switzerland• Em[r1] Natural Resources, Canada • Es[a1] European Space Operations Center, ESA, Germany • gf[z1] GeoForschungsZentrum, Germany• gt1 GeoForschungsZentrum, Germany (Tiga)• jp[l1] Jet Propulsion Laboratory, USA• mi[t1] Massachusetts Institute of Technology, USA (AC + GNAAC)• nc[l1] Newcastle England (GNAAC)nc[l1] Newcastle, England (GNAAC)• ng[s1] National Oceanic and Atmospheric Administration / NGS, USA • pd1 GFZ Potsdam/IPG Dresden, Germany• si[o1] Scripps Institution of Oceanography, USA• ul1 University of La Rochelle, France (Tiga)

• All Data/Products Centers• All Agencies and people that contributed station data.All Agencies and people that contributed station data.

Documents

0302 Ferland - IGS Analysis Center Coordinator (ACC)of the reprocessed IGS Analysis Center ... GPS Week Official Official Repro1. ... gf1 14 914.9 474.7 10 310.3 555.5 11 911.9acc.igs.org/repro1/repro1-combo_IGSW10.pdf ·