低信噪比小样本下的短波测向技术  

HF DOA Technique under Low SNR and Small Number of Snapshots

作　　者：李立峰[1,2] 冯晓东 LI li-feng FENG Xiao-dong(Equipment Engineering Technology Research Laboratory, Shijiazhuang Hebei 050081, China The 54th Research Institute of CETC, Shijiazhuang Hebei 050081, China Military Representative Office of Equipment Development Department in Shijiazhuang, Shijiazhuang Hebei 050081,China)

机构地区：[1]装备工程技术研究实验室,河北石家庄050081 [2]中国电子科技集团公司第五十四研究所,河北石家庄050081 [3]装备发展部军事代表局驻石家庄地区军事代表室,河北石家庄050081

出　　处：《无线电通信技术》2017年第2期44-46,54,共4页Radio Communications Technology

基　　金：国家部委基金资助项目

摘　　要：针对短波信道衰落导致接收信噪比低引起测向性能下降的问题,提出了谱线增强技术,利用窗函数对阵元接收信号在测向前进行复指数加权处理,达到提高信噪比的目的。针对传统空间谱测向算法在小样本数或信号源相近等条件下分辨率严重下降的问题,提出了基于谱函数二阶偏导数的处理方法,达到提高测向分辨率的目的。最后对测向性能进行了分析验证,证实了该方法的有效性和适用性。The performance of DOA decreases under low signal noise ratio（ SNR） because of shortwave channel fading.In view of this problem,a method named spectral-line enhancement algorithm is proposed. In order to improve SNR,the array arriving data is processed by complex-exponential weighting using window function before DOA.The resolution decreases in direction of arrival（ DOA）estimation under severe environments such as small number of snapshots or incident waves from close angles.In view of this problem,a high-resolution estimation method is proposed based on calculation of the second derivative of spectrum. Finally,the test results show that this method is available and applicable.

关 键 词：短波信道 低信噪比 谱线增强 二阶偏导数 

分 类 号：TN911[电子电信—通信与信息系统]