基于多个天线阵组网的短波协同定位方法  

Cooperative location method in short wave based on multiple antenna arrays networking

作　　者：俞春华[1,2] 张兴敢[1,2] 柏业超[1,2] 

机构地区：[1]南京大学电子科学与工程学院,南京210093 [2]东南大学移动通信国家重点实验室,南京210096

出　　处：《南京大学学报（自然科学版）》2012年第1期20-25,共6页Journal of Nanjing University（Natural Science）

基　　金：东南大学移动通信国家重点实验室开放课题(200902)

摘　　要：短波信号存在着超视距、时变衰落和干扰信号多等特点,因此很难对短波信号发射源进行定位.为解决以上问题,本文首次提出一种多个天线阵列组网、系统协同定位短波发射源的方法.该方法使用全向天线均匀线性阵列,可以接收不同方向的短波信号;充分利用信号循环平稳特性,采用基于循环多信号分类的空间谱估计方法,该方法根据接收信号计算循环自相关矩阵,通过奇异值分解求取信号子空间和噪声子空间,估计出感兴趣信号的波达方向;最后使用新型多信道接收测向设备和中央控制器等设备组网,整个系统综合分析确定短波信号发射源位置.该方法通过不同地点的子阵列测向并采用加权平均法,可以利用各电离层通道之间的不相关性,减少定位计算对信道变化的敏感度,提高复杂环境下的定位准确度.同时该方法组网灵活,数据传输快.在有噪声和干扰信号的情况下,仿真研究表明该方法有效且稳定性较强,与MUSIC测向后定位方法比较,该方法有更强的信号选择性和抗干扰性,并且天线阵元数更少.Since short wave signal features in transmission out of sight,time-variant fading and coexisting interferences,it is hard to locate short wave emission source.To solve the problem above,a cooperative method through multiple antenna arrays networking is proposed in this paper for the first time. To receive short wave signals from different direction,omnidirectional uniform linear antenna arrays are applied in the method.In this paper,a spatial spectrum estimation algorithm called cyclic multiple signal classification(Cyclic MUSIC) is also applied for the cyclostationarity of short wave signal.To improve the performance of the conventional multiple signal classification,Cyclic MUSIC is shown to be effective to combat noise and interference signals by exploiting cyclostationarity.The cyclic autocorrelation matrix of received short wave signals is calculated first,the autocorrelation matrix exploited by Cyclic MUSIC method is generally not Hermitian,instead of using the eigenvalue decomposition,Cyclic MUSIC uses the singular value decomposition of the autocorrelation matrix,which can produce signal subspace and noise subspace.Based on the signal subspace,the Cyclic MUSIC spatial spectrum can be obtained.Finally,by searching for the highest peak in the spectrum,the direction of arrival of signal of interest is estimated.The network is composed of new type of multichannel receiving and direction finding equipments with central controller,which can jointly locate short wave emission source by multiple antenna arrays.Some antenna arrays in different places detect the direction of short wave signal of interest,and the weighed averaging algorithm is adopted to locate the short wave emission source.It can make use of uncorrelation between ionosphere channels,which can reduce the sensitivity to the channel change,and improve the accuracy of location in complex environment.In this paper,the networking is flexible and the data transmission rate is very high.The proposed method performs well in the presence of noise and interfe

关 键 词：循环平稳特性 循环多信号分类 均匀线性阵列 波达方向 

分 类 号：TN975[电子电信—信号与信息处理]