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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
VieVS User Workshop 2010 3
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
VieVS User Workshop 2010 4
GUI for RFDefinition of datum
VieVS/DATA/GLOB/TRF/
VieVS/DATA/GLOB/CRF/
DATUM/
DISCONT/ VELOC/
DATUM/
FIXED_SOURCES/
VieVS User Workshop 2010 5
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_ ...
VieVS User Workshop 2010 6
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
VieVS User Workshop 2010 7
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)
VieVS User Workshop 2010 8
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
VieVS User Workshop 2010 9
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
VieVS User Workshop 2010 10
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
VieVS User Workshop 2010 11
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
VieVS User Workshop 2010 12
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
VieVS User Workshop 2010 13
Thank you for your attention!
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