发射台三阶互调干扰民航通讯的分析与实践  

Analysis and Practice of Interference to Civil Aviation Communication Due to 3^rd Order Intermodulation in FM Broadcasting Stations

作　　者：夏利民 金玉 Xia Limin;Jin Yu(Yuxi Radio and Television Service Development Center,Yunnan 653100,China;Yuxi Radio and Television Broadcasting Security and Monitoring Center,Yunnan 653100,China)

机构地区：[1]玉溪市广播电视事业发展中心,云南653100 [2]玉溪市广播电视安全播出监测中心,云南653100

出　　处：《广播与电视技术》2020年第10期82-86,共5页Radio & TV Broadcast Engineering

摘　　要：民航干扰排查是广播电视发射台站一个经常遇到的问题,如何确定干扰信号是否从本台发出必须有一个清晰的判定。根据我们多年来探索和实践,在发射机工作正常情况下,台内调频发射机产生的三阶互调是干扰民航通讯的主要原因。本文给出了三阶互调产生的机制分析,并一步提出了恰当的发射天线隔离可以有效减小三阶互调干扰。本文的理论分析和实践结果增进了对于调频发射台民航干扰的理解和解决。Detection and prevention of interference to civil aviation communication is a common problem encountered by radio and television transmitting stations.It is critical to determine whether interference signal is from the station.Based on our exploration and practice for many years,3rd order intermodulation produced by FM transmitters is main reason of such interference when FM transmitters work normally.This paper presents mechanism analysis of third-order intermodulation,and proposes that such an interference signal can be effectively suppressed by proper isolation of the transmitting antennas.Our theoretical analysis and practical results promote understanding and prevention of civil aviation interference from FM transmitters.

关 键 词：民航通信干扰 葛谋—潘模型 三阶互调 天线隔离度 

分 类 号：TN94[电子电信—信号与信息处理]