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Table 3 Normalized dUT1 repeatability for the 18 + 1 network showing the importance of individually optimized weight factor combinations for each network geometry

From: Optimal antenna locations of the VLBI Global Observing System for the estimation of Earth orientation parameters

Best parameters

Training antenna position

p1

p2

p3

p4

p5

p6

p7

\(\vec {\omega }_{p1,{\text{dUT}}1}\)

1.00

1.17

1.26

1.19

1.03

1.25

1.46

\(\vec {\omega }_{p2,{\text{dUT}}1}\)

1.12

1.00

1.36

1.08

1.12

1.23

1.28

\(\vec {\omega }_{p3,{\text{dUT}}1}\)

1.10

1.71

1.00

1.21

1.21

1.26

1.15

\(\vec {\omega }_{p4,{\text{dUT}}1}\)

1.42

1.38

1.19

1.00

1.19

1.23

1.22

\(\vec {\omega }_{p5,{\text{dUT}}1}\)

1.57

1.36

1.30

1.37

1.00

1.66

1.37

\(\vec {\omega }_{p6,{\text{dUT}}1}\)

1.40

1.34

1.48

1.37

1.28

1.00

1.04

\(\vec {\omega }_{p7,{\text{dUT}}1}\)

1.09

1.38

1.21

1.03

1.38

1.09

1.00

  1. Similar results can be seen for the 6 + 1 and 12 + 1 networks and all EOP. Values larger than 1.00 indicate how much the results degrade when not using the optimum weighting scheme for a particular training antenna position