究目的: 通过分析公网 GSM 系统和铁路 GSM - R 系统的频点及可能产生的二阶及三阶互调干扰,用计算机仿真找到可能对铁路 GSM - R 频率产生干扰的频点组合,给铁路沿线公网 GSM 系统的频率规划提出建议。
研究结论: (1)铁路沿线的公网 GSM 系统对铁路 GSM - R 系统产生互调干扰的概率很高;(2)在铁路沿线的公网 GSM 系统需根据 GSM - R 系统所使用的频率进行频率规划,以避免对 GSM - R 系统造成干扰,影响铁路安全运行;(3)运营商在对铁路沿线已建成的 GSM 网络进行频点调整优化时,需要了解铁路 GSM - R 使用的频点,再进行优化,避免对 GSM - R 系统造成干扰。
Research purposes: Though the analysis of the frequencies and the possible second - order and third - orderintermodulation interferences of the public GSM system and GSM - R system,the computer simulation is made to findout the interferences combinations for putting forward the advices on the frequency planning of the public GSM system along the railway.
Research conclusions:(1)The possibility of the intermodulation interferences of the public GSM system on the GSM -R system is high. (2)The frequency planning of public GSM system alone railway shall be planned according to the used frequency of GSM - R system,so that the GSM - R system will not interfered by GSM system and safety of railway operation can be ensured. (3)When the business enterprise adjusts and optimizes the GSM - R network being along the railway,it is necessary to know the frequency points for GSM - R for optimizing to avoid the interference on the GSM - R system.