Quantization of regional interference level threshold for radio observatory sites and its application

To efficiently analyze and evaluate the effect of radiation sources around the station site on astronomical observations, a method to quantify the interference level threshold of station site regionalization is proposed. A terrain model of the station site is established and meshed, and an efficient grid retrieval algorithm is used to extract relative terrain data from any position (grid) within the station site area. Based on this, a radio propagation algorithm adapted to the topographic characteristics of the station site is selected to calculate the radio propagation loss from any location of the station site to the telescope. Considering the interference level limit and side lobe gain of the telescope feed interface, a threshold quantization of the interference level in the station site area is implemented. This approach is then applied to the QTT (QiTai Radio Telescope) station site, providing important technical support for electromagnetic compatibility measurement of the radio telescope, radio management of the station site, and interference mitigation strategy.