基于连续小波互谱的宽带Chirp信号DOA估计  

DOA Estimation of wide-band Chirp signal based on cross-spectra of continuous wavelet

作　　者：王东辉[1] 庞伟正[1] 刘成德[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《应用科技》2007年第4期13-15,共3页Applied Science and Technology

摘　　要：提出一种时频域宽带源波达方向(DOA)估计算法.该算法通过计算参考阵元和其他阵元的连续小波互谱,构造出一种新的时频域数据向量模型,并利用Chirp信号的局部窄带特性,在信号的主要能量聚集区选择时频点构造时频相关矩阵代替传统的阵列相关矩阵,进行特征分解实现信号的DOA估计.该方法同时在空域和时频域进行处理,充分利用了时频分布的能量聚集性,实现了非平稳信号时频域的分离.仿真结果验证了新方法的有效性.A novel algorithm is proposed for DOA estimation of wideband source in time-frequency domain. This algorithm implements DOA estimation by constructing a new vector model of time-frequency domain data by computing reference array and by constructing time-frequeucy correlative matrix in place of conventional array watrix through selection of time-frequency point residing on its own auto-term region with the local narrow-band performance of chirp signal. This algorithm handles space domain and time-frequency domain simultaneously and completes the separation of time-frequency domain of non-stable signal by full use of energy aggregation of time-frequency distribution. The simulation verifies the effectiveness of the new algorithm.

关 键 词：DOA CHIRP信号 连续小波互谱 宽带 

分 类 号：TN911.7[电子电信—通信与信息系统]