基于自适应模板的卫星电视信号异常检测方法  

Novel method of abnormity detection for satellite tv signal based on adaptive pattern

作　　者：彭春晓 龚芹 陈楠 刘康 Peng Chunxiao;Gong Qin;Chen Nan;Liu Kang(Chengdu Outwit Science and Technology Co.,Ltd,Chengdu 611731,China)

机构地区：[1]成都奥特为科技有限公司,成都611731

出　　处：《国外电子测量技术》2020年第4期42-46,共5页Foreign Electronic Measurement Technology

摘　　要：卫星电视信号在传输过程中极易受到干扰,传统"通用仪器监测+人工观察"的异常检测手段实时性、准确性都非常低。提出一种基于自适应模板的卫星电视信号异常检测方法,首先采集正常信号的频谱作为模板,设计多种异常类型信号与模板的比对算法,识别各种异常,提高了检测的实时性;在监测中,告警阈值的设定也非常关键,引入告警反馈机制实现告警阈值参数的自动调整,来提高可靠性;由于环境影响,正常的卫星信号本身也可能发生变化,因此设计了自适应模板生成算法,根据情况自动更新模板,减少误判,进一步提高准确性。经试验验证,非自适应模板告警658次,误报490,自适应模板告警159次,误报次数为0,由此可见,该算法能实时精准的检查异常信号。Satellite TV signal is very easy to be interfered in the transmission process.The traditional anomaly detection method,which depends on both general instrument monitoring and artificial observation has very low real-time and accuracy.An anomaly detection method of satellite TV signal based on adaptive template is proposed.Firstly,the spectrum of normal signal is collected as template,and a comparison algorithm between different types of abnormal signal and template is designed,In the process of monitoring,the alarm threshold setting is also very important.The alarm feedback mechanism is introduced to realize the automatic adjustment of alarm threshold parameters,so as to improve the reliability.Due to the environmental impact,the normal satellite signal itself may change,so the adaptive template generation algorithm is designed to automatically update the template according to the situation,so as to reduce the risk Misjudgment,further improve the accuracy.It is verified by experiments that 658 times of non-adaptive template alarms,490 times of false alarms,159 times of adaptive template alarms,and 0 times of false alarms.Therefore,this algorithm can check the abnormal signals in real time and accurately.

关 键 词：卫星电视信号 异常检测 自适应模板 阈值 

分 类 号：TN98[电子电信—信息与通信工程]