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International GPS Service (IGS) Contribution to the International Terrestrial Reference Frame (ITRF). R. Ferland Geodetic Survey Division Geomatics Canada. Outline. IGS Participation to ITRF IGS Realization and Dissemination of ITRF Network Analysis Products

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international gps service igs contribution to the international terrestrial reference frame itrf

International GPS Service (IGS) Contribution to theInternational Terrestrial Reference Frame (ITRF)

R. Ferland

Geodetic Survey Division

Geomatics Canada

outline
Outline
  • IGS Participation to ITRF
  • IGS Realization and Dissemination of ITRF
    • Network
    • Analysis
    • Products
      • Station Coordinates & Velocity
      • ERP’s
      • Geocenter
  • Final Remarks
contributions in itrf2000

VLBI

LLR

GRIM

GIUB

GSFC

SHA

FSG

EUR

GFZ

DGFI

CODE

SLR

CSR

IGN1

JPL1

IGN2

ITRF2000

AUS

CGS

CRL

NCL

JPL2

REGA

NOAA

DEOS

DGFI

JCET

DORIS

Multi-Techniques

GRGS

IGN

GPS

Contributions in ITRF2000

GLOBAL

IGS

Densification

weekly cumulative combination

cod

cod

cod

cod

cod

emr

emr

emr

emr

emr

esa

esa

esa

esa

esa

gfz

gfz

gfz

gfz

gfz

jpl

jpl

jpl

jpl

jpl

ngs

ngs

ngs

ngs

ngs

sio

sio

sio

sio

sio

JPL

JPL

IGSnow

JPL

JPL

JPL

mit

mit

mit

mit

mit

ncl

ncl

ncl

ncl

ncl

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igs

igs

igs

igs

igs

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Weekly/Cumulative Combination

Global Network Associate

Analysis Centers (GNAAC)

Analysis Centers

GPS Wk.

0837

…..

…..

…..

now

+1900 solutions

+800 solutions

Cumulative

All Available Covariance Information is Used.

igs realization and dissemination of itrf

Realization

ITRF2000

IGS

Subset

Products

- Stations:

- Coordinates

- Accumulated Coor./Vel.

- Daily ERP’s

- Apparent Geocenter

- Transformation Parameters

ITRF

Subset

IGS Realization and Dissemination of ITRF

Weekly Analysis

- IGS Subset aligned to ITRF Subset to ensures maximum Internal

consistency and stability of the

products.

Used during the Orbit Combination

process performed at CODE, to ensure

consistency between the products.

slide20

Smoothed Weighted RMS of IGS Final Orbits *

* http://www.aiub.unibe.ch/acc.html

final remarks
Final Remarks
  • Cumulative solution:
    • over 5 years of data
    • +- 2700 weekly solutions
    • 270 stations
  • 167 Stations submitted to ITRF.
  • Comparison of IGS cumulative and ITRF2000:
    • Position RMS ( H = 1mm , V = 3mm )
    • Velocity RMS ( H = 2mm/y , V = 5mm/y )
  • IGS realization of ITRF uses a subset of the IGS cumulative solution to improve internal stability and consistency.
final remarks cont
Final Remarks (Cont.)
  • Redundancy and Robustness in the Analysis.
  • Station and Satellite Position Statistics show similar improvement trends.
  • Contribution (see: http://igscb.jpl.nasa.gov/):
    • All Agencies responsible for the installation and maintenance of the tracking stations.
    • Data Centers
      • Global (gsfc, sio, ign) Regional ( …..)
    • Analysis:
      • AC (cod, emr, esa, gfz, jpl, ngs, sio)
      • GNAAC ( jpl, mit, ncl)
    • …….