honeywell technology solutions inc awg meeting, washington dc, oct 3-4, 2002 comparison of ilrs...

Honeywell Technology Solutions IncAWG Meeting, Washington DC, Oct 3-4, 2002

Comparison of ILRS Station Positions (“AA” & “A” Series, i.e. 1999)

Van Husson


1999 NP Data Volume

< 30 NPs No data CORE Site

Legend

CDP Region Location 990103 990131 990228 990328 990425 990523 990620 990718 990815 990912 991010 991107 991205 Total7080 McDonald 458 398 304 264 531 318 217 403 526 408 572 237 219 48557105 Greenbelt 433 478 688 806 728 660 365 561 140 1057 1397 1114 839 92667110 Monument Peak 1100 1352 1560 893 1107 1303 1520 1642 1801 1604 1981 1573 889 183257403 S. America Arequipa 66 15 11 86 293 307 245 322 164 71 69 177 50 18761884 Riga 17 34 366 224 343 155 89 343 647 357 337 91 67 30701893 Katsively 61 94 18 1737548 Cagliari 28 81 35 75 35 51 30 23 60 69 19 5067806 Metsahovi 10 12 86 57 181 144 128 208 36 8627810 Zimmerwald 1016 389 644 140 120 175 607 603 172 460 717 420 54637811 Borowiec 193 63 407 282 301 216 105 284 537 449 374 158 74 34437824 San Fernando 138 293 273 175 217 200 454 290 881 501 34227835 Grasse 241 171 345 431 192 511 475 229 251 481 307 807 559 50007836 Potsdam 99 79 195 245 171 124 234 362 387 261 504 276 92 30297839 Graz 1057 979 1101 828 652 490 583 893 277 1013 694 567 960 100947840 Herstmoncuex 845 825 1039 865 928 826 1031 859 1374 757 1363 951 690 123537845 Grasse(LLR) 244 142 73 84 679 574 561 457 389 160 457 263 40837939 Matera 334 477 520 617 435 388 304 369 354 642 443 397 190 54708834 Wettzell 452 222 779 200 818 433 717 1044 641 500 707 494 168 7175

7501 S. Africa Hartebeesthoek 01864 Maidanak 88 142 87 110 191 182 129 70 192 202 54 7 111 15651868 Komsomolsk 5 142 211 30 45 8 93 35 128 28 7257236 Wuhan 33 98 16 1477237 Changchun 173 89 241 132 168 103 1012 1261 785 657 46217249 Beijing 41 22 \ 97 138 32 4 5 18 141 416 242 287 14437820 Kunming 205 299 232 193 136 80 91 36 651 120 20437837 Shanghai 12 224 106 204 303 199 18 235 87 259 84 218 523 24727328 Koganei 84 61 72 163 159 40 21 9 206 453 664 423 23557335 Kashima 8 42 157 143 21 49 59 52 151 201 410 12937337 Miura 18 35 6 58 7 5 6 134 104 298 6717339 Tateyama 113 188 72 101 58 10 24 7 156 287 813 18297838 Simosato 247 200 49 25 3 17 108 80 13 79 428 12497090 Yarragadee 1351 1213 1052 757 688 882 941 1286 1164 804 1052 792 494 124767849 Mt. Stromlo 619 787 581 1017 1631 977 1039 740 624 777 980 976 506 11254

7124 Tahiti 174 282 76 285 128 429 505 438 2317

7210 Haleakala 225 198 133 135 183 138 132 113 3 1260

9676 9656 11186 9566 11164 10034 10143 11773 10296 12526 14774 14276 11115 146185Totals

Europe

N. America

Asia

Japan

Australia

Pacific


1999 Performance Problems

< 30 NPs No data SC - Scale US - Unstable RB - Range Bias TB - Time Bias BA - Barometric CORE SiteLegend

CDP Region Location 990103 990131 990228 990328 990425 990523 990620 990718 990815 990912 991010 991107 9912057080 McDonald7105 Greenbelt TB, BA TB. SC BA7110 Monument Peak7403 S. America Arequipa1884 Riga US US US1893 Katsively7548 Cagliari SC SC SC SC SC SC SC SC SC SC SC7806 Metsahovi7810 Zimmerwald RB7811 Borowiec7824 San Fernando US7835 Grasse7836 Potsdam7839 Graz7840 Herstmoncuex7845 Grasse(LLR)7939 Matera8834 Wettzell

7501 S. Africa Hartebeesthoek1864 Maidanak BA BA BA BA BA BA BA BA BA BA BA BA1868 Komsomolsk RB7236 Wuhan7237 Changchun7249 Beijing7820 Kunming SC, BA SC, BA SC SC SC SC SC SC SC, TB SC7837 Shanghai7328 Koganei7335 Kashima7337 Miura7339 Tateyama7838 Simosato7090 Yarragadee7849 Mt. Stromlo7124 Tahiti7210 Haleakala TB TBPacific

Europe

N. America

Asia

Japan

Australia


1999 Height Standard DeviationsCDP

ASI AA ASI A

NERC AA

NERC A

CRL AA CRL A

JCET AA

JCET A CSR A

DGFI A

IAAK A

182418631864 0.032 0.052 0.040 0.039 0.357 0.008 0.030 0.013 0.0241868 0.118 0.074 0.153 0.139 0.136 0.012 0.017 0.035 0.018 0.013187018731884 0.030 0.018 0.038 0.072 0.237 0.243 0.015 0.019 0.021 0.032 0.0381893 0.014 0.036 0.068 0.012 0.027 0.000 0.023 0.0207080 0.005 0.010 0.008 0.029 0.006 0.008 0.007 0.003 0.006 0.005 0.0067090 0.003 0.009 0.008 0.017 0.004 0.009 0.005 0.002 0.007 0.005 0.0067105 0.005 0.006 0.009 0.024 0.004 0.009 0.006 0.003 0.008 0.004 0.0057110 0.005 0.008 0.003 0.024 0.005 0.007 0.004 0.003 0.004 0.004 0.0067124 0.003 0.008 0.028 0.005 0.011 0.067 0.081 0.007 0.006 0.0107210 0.005 0.019 0.010 0.029 0.008 0.023 0.012 0.006 0.008 0.058 0.00172317236 0.215 0.473 0.000 0.0097237 0.007 0.018 0.015 0.026 0.015 0.011 0.010 0.011 0.012 0.005 0.0107249 0.058 0.318 0.113 0.106 0.149 0.078 0.010 0.027 0.115 0.036 0.0287328 0.007 0.062 0.016 0.048 0.006 0.014 0.011 0.008 0.013 0.009 0.0107335 0.008 0.029 0.011 0.046 0.013 0.027 0.008 0.003 0.013 0.011 0.0077337 0.009 0.049 0.020 0.061 0.002 0.013 0.005 0.008 0.050 0.0077339 0.009 0.029 0.030 0.045 0.009 0.019 0.007 0.011 0.020 0.015 0.0047343735573567403 0.010 0.017 0.015 0.052 0.003 0.025 0.012 0.003 0.010 0.015 0.01275017548 0.193 0.090 0.231 0.024 0.084 0.05375947806 0.059 0.023 0.061 0.009 0.034 0.015 0.004 0.013 0.030 0.0077810 0.010 0.015 0.018 0.039 0.007 0.014 0.011 0.025 0.010 0.009 0.0117811 0.013 0.028 0.041 0.081 0.026 0.026 0.018 0.018 0.024 0.007 0.0097820 0.026 0.053 0.011 0.335 0.067 0.162 0.034 0.082 0.281 0.036 0.0747824 0.025 0.037 0.028 0.064 0.030 0.063 0.018 0.010 0.016 0.013 0.0297831 0.121 0.136 0.044 0.015 0.079 0.10978327835 0.008 0.018 0.016 0.035 0.008 0.015 0.007 0.003 0.008 0.008 0.0087836 0.007 0.013 0.010 0.052 0.005 0.016 0.005 0.003 0.010 0.008 0.0057837 0.012 0.082 0.021 0.053 0.028 0.026 0.012 0.006 0.013 0.027 0.0167838 0.028 0.145 0.030 0.082 0.030 0.048 0.009 0.005 0.028 0.027 0.0327839 0.008 0.011 0.008 0.024 0.007 0.008 0.008 0.003 0.007 0.008 0.0087840 0.005 0.010 0.005 0.029 0.006 0.009 0.007 0.003 0.007 0.005 0.0047845 0.010 0.011 0.010 0.031 0.011 0.012 0.009 0.004 0.009 0.008 0.0127849 0.004 0.009 0.007 0.025 0.006 0.006 0.005 0.002 0.006 0.006 0.0077939 0.007 0.026 0.045 0.076 0.101 0.078 0.025 0.017 0.027 0.010 0.0338834 0.011 0.015 0.012 0.052 0.012 0.013 0.016 0.013 0.012 0.010 0.013

# of sites 28 34 31 34 32 35 35** 31 33 35 31best 12 0.006 0.012 0.009 0.031 0.006 0.012 0.007 0.003 0.007 0.011 0.007


1999 Avg. Height Variations(best 12 sites)

0.000

0.005

0.010

0.015

0.020

0.025

0.030

AS

I A

A

AS

I A

NE

RC

AA

NE

RC

A

CR

L A

A

CR

L A

JCE

T A

A

JCE

T A

CS

R A

DG

FI

A

IAA

K A

Ave

rag

e H

eig

ht

Var

atio

ns(

m)


“A” Series Data Treatmentby site/28 days

There are significant differences in data treatment.

1. DGFI estimated pass-by-pass biases, when the suspected range or time bias exceeded 30mm or 30 microseconds, respectively.2. IAAK assumed no biases, except a constant RB for Maidanak and Komsomolsk3. For the core sites, assumed no biases, for other sites RB estimated every 7 days per satellite

Analysis Center

L1 Range Bias

L2 Range Bias

Common L1/L2 Range Bias

"0" Range Bias

Bias Estimate Frequency

Time Bias

Arc Length

NP minimum

Data Weights Comments

ASI every 28 days 28 days 1 m

AUS every 7 days 28 days 1&5 cm

JCET as needed 28 days 1,4,10 m see footnote 3

CRL every 28 days 4 days 30 1, 100 m

CSR every 28 days 28 days 30 NP RMS

NERC every 28 days 28 days 30 2 cm

DGFI as needed 7 days 3 1,2,5 cm see footnote 1

IAAK N/A 7 days 80 ? see footnote 2


“AA” Series Data Treatmentby site/28 days

The data treatment differences are vanishing.Will this map into less deviations in site heights?

Analysis Center

L1 Range Bias

L2 Range Bias

Common L1/L2 Range Bias

"0" Range Bias

Bias Estimate Frequency

Time Bias

Arc Length

NP minimum

Data Weights Comments

ASI every 28 days 28 days 30 1m

JCET every 28 days 28 days 30 1m see footnote 1

CRL every 28 days 7 days 30 1m(6), 100m see footnote 1

NERC every 28 days 28 days 30 1m, 10m see footnote 1

1. For the better sites, assumed no biases, for other sites RB estimated once/28 days.


-100

-80

-60

-40

-20

0

20

40

60

80

100

Height

Radial

Baseline

Range Bias

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

OM

C(m

m)

Monument Peak McDonald Greenbelt

Herstmonceux Grasse Graz

Yarragadee Mt. Stromlo

-100

-80

-60

-40

-20

0

20

40

60

80

100

OM

C(m

m)

-100

-80

-60

-40

-20

0

20

40

60

80

100

OM

C(m

m)

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

ASI Analysis (Sol “A” V1)(state vector error)


Any modeling errors (e.g. GM, satellite CoM, troposphere, biases, data weighting, data treatment) will be absorbed into the station coordinates, mostly height.

What can be done to mitigate these errors?

Effect of Modeling Errors

Modeling Error Range BiasRadialHeight

BaselinesScale


ASI Sol AA V1

ASI Sol A V3

ASI Sol A V1

ASI Analysis (Solution Comparison)

-100

-80

-60

-40

-20

0

20

40

60

80

100

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

He

igh

t(m

m)




-100

-80

-60

-40

-20

0

20

40

60

80

100

He

igh

t(m

m)

-100

-80

-60

-40

-20

0

20

40

60

80

100

He

igh

t(m

m)

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

SolAA.V1 (no rb estimation)

SolA.V3 (rb estimation)

SolA.V1 (state vector error)


CRL Analysis (Solution Comparison)

-100

-80

-60

-40

-20

0

20

40

60

80

100

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

He

igh

t(m

m)




-100

-80

-60

-40

-20

0

20

40

60

80

100

He

igh

t(m

m)

-100

-80

-60

-40

-20

0

20

40

60

80

100

He

igh

t(m

m)

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9




NER Sol AA V1

NER Sol A V1

NERC Analysis (Solution Comparison)

-100

-80

-60

-40

-20

0

20

40

60

80

100

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

He

igh

t(m

m)




-100

-80

-60

-40

-20

0

20

40

60

80

100

He

igh

t(m

m)

-100

-80

-60

-40

-20

0

20

40

60

80

100

He

igh

t(m

m)

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9



Fixed error in sat. once/rev accelerationbetween SolA.V1 and SolAA.V1.


-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Monument Peak

McDonald

Greenbelt

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Herstmonceux

Grasse

Graz

JCET Solution ComparisonsJCET A

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Yarragadee

Mt. Stromlo

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Herstmonceux

Grasse

Graz

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Monument Peak

McDonald

Greenbelt

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Yarragadee

Mt. Stromlo

JCET AA


1999 Height Agreement by Region

-40

-30

-20

-10

0

10

20

30

40

CORE N. America Europe Australia

Hei

gh

t O

MC

fro

m IT

RF

2000

(m

m)

NERC Sol AA

JCET Sol AA

ASI Sol AA

CRL Sol AA

CSR Sol A

DGFI Sol A

IAAK Sol A


1999 Range Bias Comparison

Range bias estimates averaged over the yearare in excellent agreement

Longitude-60

-50

-40

-30

-20

-10

0

10

20

30

40

50

60M

on

um

ent

Pe

ak

Mc

Do

na

ld

Gre

en

be

lt

Are

qu

ipa

He

rts

mo

nc

eu

x

Gra

ss

e

Gra

ss

e(L

LR

)

Zim

me

rwa

ld

Gra

z

We

ttze

ll

Po

tsd

am

Bo

row

iec

Ma

ida

na

k (

+1

00

mm

)

Ya

rra

ga

de

e

Ch

an

gc

hu

n

Sh

ang

ha

i

Ko

ga

ne

i

Ta

tey

am

a

Mt.

Str

om

lo

Ha

lea

ka

la

Ta

hit

i

Ran

ge

Bia

s(m

m)

CSR A

CRL A

ASI A

NERC A


-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Monument Peak

McDonald

Greenbelt

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Monument Peak

McDonald

Greenbelt

Height ComparisonsASI AA

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Herstmonceux

Grasse

Graz

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Yarragadee

Mt. Stromlo

CRL AA

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Herstmonceux

Grasse

Graz

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Yarragadee

Mt. Stromlo

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Herstmonceux

Grasse

Graz

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Monument Peak

McDonald

Greenbelt

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Yarragadee

Mt. Stromlo

JCET AA


-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Monument Peak

McDonald

Greenbelt

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Monument Peak

McDonald

Greenbelt

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Monument Peak

McDonald

Greenbelt

1999 Height Comparisons

IAAK A

CSR A

DGFI A

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Herstmonceux

Grasse

Graz

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Yarragadee

Mt. Stromlo

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Yarragadee

Mt. Stromlo

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Herstmonceux

Grasse

Graz

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Herstmonceux

Grasse

Graz

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Yarragadee

Mt. Stromlo

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9


-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Monument Peak

McDonald

Greenbelt

1999 Height ComparisonsNERC AA

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Yarragadee

Mt. Stromlo

-40

-30

-20

-10

0

10

20

30

40

Res

idu

als

vs IT

RF

2000

(mm

)

Herstmonceux

Grasse

Graz


804.000

804.010

804.020

804.030

804.040

804.050

804.060

804.070

804.080

804.090

804.100

241.300

241.310

241.320

241.330

241.340

241.350

241.360

241.370

241.380

241.390

241.400

539.340

539.350

539.360

539.370

539.380

539.390

539.400

539.410

539.420

539.430

539.440

1322.780

1322.790

1322.800

1322.810

1322.820

1322.830

1322.840

1322.850

1322.860

1322.870

1322.880

19.150

19.160

19.170

19.180

19.190

19.200

19.210

19.220

19.230

19.240

19.250

2004.230

2004.240

2004.250

2004.260

2004.270

2004.280

2004.290

2004.300

2004.310

2004.320

2004.330

75.350

75.360

75.370

75.380

75.390

75.400

75.410

75.420

75.430

75.440

75.450

1838.980

1838.990

1839.000

1839.010

1839.020

1839.030

1839.040

1839.050

1839.060

1839.070

1839.080

Solution Comparisons

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

He

igh

t(m

m)




He

igh

t(m

m)

He

igh

t(m

m)

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

JCET

CSR

ASI

DGFI

CRL

IAAK

NERC


665.320

665.330

665.340

665.350

665.360

665.370

665.380

665.390

665.400

665.410

665.420

122.600

122.610

122.620

122.630

122.640

122.650

122.660

122.670

122.680

122.690

122.700

951.270

951.280

951.290

951.300

951.310

951.320

951.330

951.340

951.350

951.360

951.370

1323.300

1323.310

1323.320

1323.330

1323.340

1323.350

1323.360

1323.370

1323.380

1323.390

1323.400

539.340

539.350

539.360

539.370

539.380

539.390

539.400

539.410

539.420

539.430

539.440

1322.780

1322.790

1322.800

1322.810

1322.820

1322.830

1322.840

1322.850

1322.860

1322.870

1322.880

75.350

75.360

75.370

75.380

75.390

75.400

75.410

75.420

75.430

75.440

75.450

133.470

133.480

133.490

133.500

133.510

133.520

133.530

133.540

133.550

133.560

133.570

EUROLAS Comparisons

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

He

igh

t(m

m)

Potsdam Grasse LLR Zimmerwald


Borowiec Wettzell

He

igh

t(m

m)

He

igh

t(m

m)

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

JCET

CSR

ASI

DGFI

CRL

IAAK

NERC


1999 Zimmerwald Height Case StudyNorth East Up Deltas

0.002 -0.004 0.007 (GPS-SLR)ILRS Site Log Tie - (GPS-SLR)ITRF2000 positions

0.002 -0.004 0.008 (GPS-SLR)ITRF2000 Tie - (GPS-SLR)ITRF2000 positions

Dubious tie, error in SLR ITRF2000 position or error in ITRF2000 GPS position?

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

951.270

951.280

951.290

951.300

951.310

951.320

951.330

951.340

951.350

951.360

951.370

Hei

gh

t(m

)

Large variation, distribution appears bimodal oneither side of ITRF2000 height. Why?

CRL

DGFI

IAAK

NERC

CSR

ASI

ITRF2000

CRL, DGFI, & IAAKassumed no range bias.But NERC, CSR, & ASIestimated a range bias.


1999 Zimmerwald Height Case Study

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

Much less height variation, if every group applied a –18mm apriorirange bias (later confirmed by engineering analysis). Averageheight about 10mm short of ITRF2000 height. This explains

the 7-8mm offset in the local tie.

CRL

DGFI

IAAK

NERC

CSR

ASI

ITRF2000

951.290

951.300

951.310

951.320

951.330

951.340

951.350

951.360

951.370

951.380

951.390

Hei

gh

t(m

)


2004.230

2004.240

2004.250

2004.260

2004.270

2004.280

2004.290

2004.300

2004.310

2004.320

2004.330

JCET

CSR

ASI

CRL

DGFI

NERC

ITRF2000

2004.230

2004.240

2004.250

2004.260

2004.270

2004.280

2004.290

2004.300

2004.310

2004.320

2004.330

McDonald Case Study

McDonald, Null RB

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

17-J

an-9

9

14-F

eb-9

9

14-M

ar-9

9

11-A

pr-9

9

09-M

ay-9

9

06-J

un-9

9

04-J

un-9

9

01-A

ug-9

9

29-A

ug-9

9

26-S

ep-9

9

24-O

ct-9

9

21-N

ov-9

9

19-D

ec-9

9

McDonald AA and A

2004.230

2004.240

2004.250

2004.260

2004.270

2004.280

2004.290

2004.300

2004.310

2004.320

2004.330

Hei

gh

t(m

)

-0.06

-0.05

-0.04

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

0.04

RB

(m

)

CSR Height

ASI A Height

ITRF2000 Height

CSR A Range Bias Estimate

ASI A Range Bias Estimate


Lessons learned

• Modeling errors have significant influence on apparent station positions

• Range bias is an important quality control tool for the sites and the station position solutions

• 4-7mm RMSs appear to be a reasonable height RMS for a full year of 28 day solution


Future Challenges

• Complete Phase I of the benchmark project and take the lessons learned and apply them to the POS/EOP project

• Implement the data corrections file

• Implement new LAGEOS CoM

• Estimate new GM


Remarks

• We are beginning to adopt some BEST modeling practices and the solutions are converging as a result. Some more work is needed.

• We are getting close to the optimum strategy for handling of biases to get the BEST heights, but we are not there yet.

• Range bias analysis combined with site height analysis can resolve local tie issues

honeywell technology solutions inc awg meeting, washington dc, oct 3-4, 2002 comparison of ilrs...

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