Speaker
Description
The next-generation very-long-baseline interferometry (VLBI), also known as the VLBI global observing system (VGOS), was designed to observe the frequency band that spans from 2 to 14 GHz.
This range overlaps with numerous licensed radio services, as coordinated by the International Telecommunication Union (ITU).
Essentially, all VGOS frequency bands overlap with other radio services that have ground stations which emit much stronger artificial radio signals compared to those from quasars.
Additionally, there is an increasing number of space-borne emitters, e.g. from satellite communication systems.
It is becoming more crucial to avoid or mitigate signal interference from unwanted sources as more ground stations and satellites are built for telecommunication services locally and globally.
To address this issue, as a first step, we conducted Tsys monitoring sessions using the Onsala Twin Telescopes (OTT) to study the changes in the Tsys when pointing the antennas in different directions.
We also ran dedicated Tsys sessions to study the radio environment behaviour in a selected direction for an extended period.
