基于盲信号分离的机载VDB接收机同频干扰抑制  

Co-frequency interference suppression of airborne VDB receiver based on blind signal separation

作　　者：倪育德 李许光 NI Yude;LI Xuguang(School of Electronic Information and Automation,Civil Aviation University of China,Tianjin 300300,China;Key Laboratory of Civil Aircraft Airworthiness Technology,CAAC,Tianjin 300300,China)

机构地区：[1]中国民航大学电子信息与自动化学院,天津300300 [2]中国民用航空局民航航空器适航审定技术重点实验室,天津300300

出　　处：《全球定位系统》2019年第3期7-13,共7页Gnss World of China

基　　金：国家重点基础研究发展计划(2016YFB0502402)

摘　　要：针对民航飞机利用陆基增强系统(GBAS)进行精密进近着陆过程中,GBAS机载甚高频数据广播(VDB)接收机所受到的同频干扰问题,提出采用盲信号分离算法,对VDB接收机所接收到的期望信号与同频干扰信号进行分离,并通过识别解码数据中的机场标识(ID),得到所需期望信号,从而抑制同频干扰信号.分析并仿真了基于快速固定点(FastICA)算法、自然梯度算法和等变自适应分离(EASI)算法,对VDB接收机接收到的混合信号进行分离的机理和同频干扰抑制的实现.仿真结果表明,这三种算法均能有效分离期望信号与同频干扰信号,进而进行同频干扰抑制,并通过比较三种算法的收敛速度、串音误差和误码率,得出FastICA算法更适合用于VDB信号的同频干扰抑制.Aiming at the problem of co-frequency interference of ground-based augmentation systems(GBAS)airborne VHF Data Broadcasting(VDB)receiver in the process of precise approach and landing for civil aviation aircraft using GBAS,a blind signal separation algorithm is proposed to separate the desired signal from the same frequency interference signal received by VDB receiver.The desired signal is obtained by identifying the airport ID in the decoded data,so as to suppress the same frequency interference signal.Based on fast independent component analysis(Fast ICA)algorithm,natural gradient algorithm and equivariant adaptive separation via independence(EASI)algorithm,the mechanism of separating mixed signals received by VDB receivers and the realization of co-channel interference suppression are analyzed and simulated.The simulation results show that the three algorithms can effectively separate the desired signal from the same frequency interference signal,and then suppress the same frequency interference.It is concluded that fast ICA algorithm is more suitable for the same-frequency interference suppression of VDB signals by comparing the convergence speed,crosstalk error and bit error rate of the three algorithms.

关 键 词：VDB GBAS 同频干扰抑制 串音误差 误码率 

分 类 号：TN96[电子电信—信号与信息处理]