基于DFT阵列空间的谱估计测向方法  

Direction-finding Method of Spectrum Estimation Based on DFT Array Space

作　　者：张智锋[1] 林肖辉[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《舰船电子对抗》2017年第6期94-96,共3页Shipboard Electronic Countermeasure

摘　　要：提出一种基于离散傅里叶变换(DFT)阵列空间的谱估计测向方法,该方法将传统的时域空间阵列数据映射到频域阵列数据,并对信号频谱附近的数据先经过通道不一致性校正,而后利用频域数据构造协方差矩阵,再利用相应空间谱估计方法提取来波方位信息。该方法可有效简化各测向通道存在群延时情况下的幅相不一致的校准方法,并可大大减少构造协方差矩阵的维数,降低了运算量。仿真试验表明了算法的有效性。This paper proposes a spectrum evaluation direction-finding method based on discrete Fourier transformation （DFT） array space. It maps traditional time domain space array data into the frequency domain array data, firstly performs the channel inconsistency calibration of data near the signal spectrum, then uses the frequency domain data to construct the covariance matrix, finally adopts the corresponding spatial spectrum estimation method to extract the azimuth information of incoming wave. This method can effectively simplify the calibration method for amplitude and phase inconsistency of each direction-finding channel in the presence of group delay, and can greatly reduce the dimension of constructing covariance matrix and the amount of computation. The simulation test indicates the validity of the algorithm.

关 键 词：离散傅里叶变换 测向 谱估计 协方差矩阵 

分 类 号：TN911.7[电子电信—通信与信息系统]