KVN and VERA Array

Brief Summary of KVN Geodetic Measurement

KVN antenna positions are regularly monitored using GPS and geodetic VLBI observations. The K-band geodesy VLBI program between KVN and VERA has been started in 2011. Current KVN antenna positions (see Figures [*])are obtained from the KaVA K-band geodesy on January 24, 2014. The typical 1-sigma errors of geodetic solutions are about 0.4 cm in X, Y, and Z directions. Based on 22 epoch KaVA K-band geodetic observations from Sep. 2012 to Dec. 2016, uncertainty of KVN antenna positions are $\sim 2.38$ cm at Yonsei, $\sim 2.55$ cm at Ulsan and $\sim 1.58$ cm at Tamna.

Figure: The trend of KVN antenna positions (IVP) in ITRF2014 coordinate system. The x and y axes are MJD and X/Y/Z in meter. The linear fitted is applied to the measurements, shown as red line, and its deviation is also presented in each axis as "rms".
\includegraphics[width=14cm]{fig-KaVA/fig8b.eps}



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KaVA ( KVN and VERA Array )