Korean VLBI Network (KVN)

Antenna Pointing Accuracy

A sample of late type stars has been used continuously to maintain the pointing accuracy of the telescope during 2009-2017. The following table describes the accuracies of pointing models established for three KVN radio telescopes in 2017. The root mean square (rms) of the residual pointing offsets between the observations and the pointing models are listed in total, azimuth, and elevation, respectively, for each epoch and telescope.

pointing models
Site Total (arcsec) Azimuth (arcsec) Elevation (arcsec) Measured Freq. Measured Date
Yonsei3.22.42.243 GHz2016.12.31
Ulsan3.82.43.043 GHz2016.12.30
Tamna 4.63.13.443 GHz2016.12.31

In case of observations during a daytime, especially at sunrise and sunset, the pointing observations must be conducted out at least every hour for maintaining the pointing accuracy to be less than 6 arcseconds in rms.

- Yonsei

pmodel_KVNYS_20161231_after
The residual of pointing model measured at KVNYS.

- Ulsan

pmodel_KVNUS_20161230_after
The residual of pointing model measured at KVNUS.

- Tamna

pmodel_KVNTN_20161231_after
The residual of pointing model measured at KVNTN.


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Korean VLBI Network (KVN)