调频发射系统干扰研究及干扰检测仪设计

发布时间：2018-01-11 01:30

本文关键词：调频发射系统干扰研究及干扰检测仪设计　出处：《上海交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年来,随着各种无线电通信业务的发展,调频广播干扰事件逐渐增多。最为严重的是对民航通信的干扰,将直接影响飞行安全。如何有效解决调频干扰问题,成为了调频发射台急需研究的问题。通过理论研究发现,调频发射系统的干扰主要体现为互调干扰。影响互调干扰的因素有许多,主要有发射机残波功率异常、天馈系统隔离指标下降及台站设计不合理这三方面。本文根据实际的干扰案例,通过测量调频发射系统各环节残波辐射及互调干扰的频谱情况,着重研究了调频发射系统的干扰信号的特点,并提出了相应的干扰解决方案。本文参考米波调频发射标准,并结合干扰信号的特点,设计了一种调频发射系统干扰检测设备。设备能不间断地对发射台所有播出频率的残波(二次谐波)指标进行检测。当不达标时,设备可提供报警提示,提醒值班人员予以注意。本设备提高了调频发射台的干扰应对能力。本文研究的内容具有一定的应用意义,可作为调频广播与民航通信之间干扰问题解决的参考文本。
[Abstract]:In recent years, with the development of various radio communication services, the number of FM jamming incidents is increasing gradually. The most serious interference to civil aviation communications will directly affect flight safety. How to effectively solve the FM jamming problem. Through the theoretical research, it is found that the interference of FM transmission system is mainly reflected in intermodulation interference. There are many factors that affect the intermodulation interference, mainly the abnormal residual power of transmitter. In this paper, according to the actual interference cases, the frequency spectrum of residual wave radiation and intermodulation interference in every link of FM transmission system is measured. This paper focuses on the characteristics of the interference signal of FM transmission system and puts forward the corresponding interference solution. This paper refers to the meter wave FM transmission standard and combines the characteristics of the jamming signal. A kind of interference detection equipment of FM transmission system is designed. The equipment can continuously detect the residual (second harmonic) index of all broadcasting frequencies of the transmitter. When it is not up to the standard, the equipment can provide alarm warning. The equipment has improved the interference response ability of FM transmitter. The content of this paper has certain application significance. It can be used as a reference text to solve the interference problem between FM broadcasting and civil aviation communication.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN972

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