A prediction method for electromagnetic interference of large aperture radio telescope
Abstract
<p indent="0mm">The ongoing Qi Tai Radio Telescope (QTT) which is a steerable 110-m aperture radio telescope has a very high sensitivity of signal detection, thus any weak noise will affect its efficient operation. We proposed a prediction method to lower the electromagnetic interference in the radio quiet zone of QTT site. Firstly, based on the topographic data and topographic features of radio quiet zone of the QTT site, we analyzed the applicability of the existing radio wave propagation model and chosen Longley-Rice and Two-Ray model as the algorithm of the radio wave propagation model of the QTT. By the simulation analysis of radio wave propagation, we got the path loss of the potential interference point when they reached the QTT feed aperture. Secondly, the interference level limits at the position of potential interference point were calculated by combining the QTT feed aperture interference level limits and antenna side lobe gains, and its influence on the radio telescope was predicted and analyzed by combining with the field environment. Finally, the typical village electronic equipment and <sc>35 kV </sc>power supply engineering in the QTT restricted area were analyzed by using this method, and the solutions were also proposed correspondingly. </p>
