Analysis of the radio environment at prospective radio astronomy sites using Monte Carlo methods  

作　　者：Junxian Zhou Liang Dong 

机构地区：[1]School of Information Engineering,Southwest University of Science and Technology,Mianyang 621000,China [2]Yunnan Province China-Malaysia HF-VHF Advance Radio Astronomy Technology International Joint Laboratory,Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China

出　　处：《Astronomical Techniques and Instruments》2024年第6期325-334,共10页天文技术与仪器（英文）

基　　金：Construction of the Science and Technology Innovation Center for South Asia and Southeast Asia-Yunnan Province International Joint Innovation Platform: “Yunnan Province China-Malaysia HF-VHF Advanced Radio Astronomy Technology International Joint Laboratory” (202303AP140003);The National Natural Science Foundation of China Astronomical Joint Fund Cultivation Project (U203 1133);The SKA Special Project of the Ministry of Science and Technology (2020SKA0110202);The International Partnership Program of Bureau of International Cooperation, Chinese Academy of Sciences: 'Belt and Road' cooperation (114A11KYSB 20200001);The Kunming International (International) Cooperation Base project: “Yunnan Astronomical Observatory-University of Malaya Advanced Radio Astronomy Technology, Chinese Academy of Sciences” (GHJD2021022);The key special project of the Ministry of Science and Technology under the “Space Remote Sensing and Radio Astronomical Observation” of the Ministry of Science and Technology (2022YFE0140000);The High-precision calibration method of the SKA special low-frequency radio interference array of the Ministry of Science and Technology (2020SKA011 0300)

摘　　要：Radio astronomy necessitates radio frequency bands that are both stable and free from interference at observatory locations.To comprehensively evaluate the radio environment at radio observatories,we employ Monte Carlo methods to assess the quality of observational data and predict potential interference.With an extensive dataset,we used an algorithm to find the interference threshold within the L-band,automatically identifying disruptive signals.Monte Carlo simulations were conducted to estimate whether these interference signals surpass a predetermined threshold of the total observation period,facilitating a detailed analysis of the interference profile.A Monte Carlo analysis was used on 83 hours of continuous monitoring data using a wireless environment testing system,to forecast the proportion of time during which interference signals would surpass established harmful thresholds.Our findings indicate that,within the L-band spectrum at Fenghuang Hill,Kunming City,Yunnan Province,the incidence of interference within the frequency ranges of 1330–1440 MHz,1610–1613 MHz,and 1660–1670 MHz is acceptably low,with respective confidence levels of 96.9%,97.4%,and 97.4%that the proportion of time these interference signals occupy does not exceed 5%of the total observational time,as stipulated by the International Telecommunication Union.Conversely,the confidence level for the 1718–1722 MHz band not exceeding 5%of the total observational time is significantly lower at 88.5%.This study offers a valuable tool for assessing the radio environment in radio astronomy research and provides a foundational basis for the scientific management and safeguarding of radio frequency bands.

关 键 词：Radio-astronomical observation Monte Carlo Radio environmental assessment Interference prediction 

分 类 号：P161[天文地球—天文学]