VieVS User Workshop

7 – 9 September, 2010

Vienna

VIE_GLOBVIE_GLOB

Hana Spicakova

VieVS User Workshop 2010 2

Vie_glob 1c

compatible with VieVS Version 1c

parameters, which can be estimatedstation coordinates and velocitiessource coordinatesEarth orientation parameters

from combination of more sessions

input datadatum free N-matrices (ATPA) and b-vectors (ATPl)VieVS/DATA/LEVEL2created within a „normal“ run of VieVS

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How to run Vie_glob

VieVS/COMPILE/

VIE_GLOB/vie_glob.m

TEST_OUT will be created in VieVS/OUT/GLOB/_ESTIMATES/

_PLOTS/

CRF/

TRF/

RMS – „a posteriori variance of unit weight“

only sessions with a lower RMS will be used in the global adjustment

cun

PvvT

0

INPUT

OUTPUT

limit for RMS

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GUI for RFDefinition of datum

VieVS/DATA/GLOB/TRF/

VieVS/DATA/GLOB/CRF/

DATUM/

DISCONT/ VELOC/

DATUM/

FIXED_SOURCES/

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Theoretical background

Sort parameters in the N-matrix and b-vectorReduction of parameters

always reduced: clock parameters, zwd and troposhere gradientscan be reduced: EOP

Stacking of the reduced normal equation systems

2

1

2

1

2221

1211

b

b

x

x

NN

NN

estimated p.

reduced p.

211

221211 NNNNNreduc

21

22121 bNNbbreduc

nsereducreducreduc NNNN _2_1_ ...

nsereducreducreduc bbbb _2_1_ ...

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Datum definition

Station coordinates and velocitiesconstrained 12 parameters Helmert transformation(3 translation and 3 rotation components + their time derivatives w.r.t. time), i.e., NNT/NNR condition

Source coordinates4-parameters transformation (3 rotations (A1, A2, A3) around X, Y and Z axis and a parameter dz accounting for a global translation of the source coordinates in declination, caused e.g. by inaccuracy of the tropospheric propagation correction for sources observed at low elevations) (Feissel-Vernier et al. (2006))

fixing selected sources to a priori coordinates

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Final solution

Jacobian matrixapplying of the constraints

final solution

estimates are stored as a structure array in Matlab format and as a txt file

VieVS/OUT/GLOB/_ESTIMATES/TEST_OUT/globsol_TEST_LEVEL2.matglob_results_TEST_LEVEL2.txt

BBBH T 1

HHNN TREDUC

CREDUC

REDUCT

REDUCCREDUC bhHbb

REDUCCREDUC bNdx

1

1

h = 0 (requirement of

free-network constraints)

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Estimates (example)

names of sessions

number of sessions

corrections to station a priori coordinates and their standard deviations [cm]

corrections to station a priori velocities and their standard deviations [cm/y]

stations which were used for NNT/NNR

epoch of the coordinates [mjd]

start, end [mjd] of the interval (time between breaks)

sessions with RMS>maxRMS

VieVS/OUT/GLOB/_ESTIMATES/TEST_OUT/glob_results_TEST_LEVEL2.txt

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Estimates (example)

corrections to source a priori coordinates (RA, De) and their standard deviations [mas]

estimates of EOP:

dx, dy pole [mas]

dut1 [ms]

dX, dY [mas]

and their standard deviations

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Results

„new catalogues“ (TRF and CRF) will be created automatically in VieVS/OUT/GLOB/

TRF/TEST_OUT/trf_TEST_LEVEL2.txt

and

CRF/TEST_OUT/trf_TEST_LEVEL2.txt

this new TRF catalogue can be used as input catalogue in VieVS

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Plots

VieVS/OUT/GLOB/_PLOTS/TEST_OUT/

ant_activity_TEST_LEVEL2.eps

ant_map_TEST_LEVEL2.eps

stations in sessions included in the global adjustment

map of stations,

blue circles: station included in NNT/NNR

red circles: station excluded from NNT/NNR

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Plots

VieVS/OUT/GLOB/_PLOTS/TEST_OUT/

sou_activity_TEST_LEVEL2.eps

sou_map_TEST_LEVEL2.eps

stations in sessions included in the global adjustment

map of sources,

blue circles: source included in NNR

red circles: source excluded from NNR

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Thank you for your attention!