基于自聚焦的宽带Chirp信号波达方向估计  

DOA Estimation of Wide-band Chirp Sources Based on Self Focusing

作　　者：张昆帆[1] 赵拥军[1] 王锋[1] 王天鹏[1] 

机构地区：[1]解放军信息工程大学,河南郑州450002

出　　处：《信号处理》2009年第4期559-562,共4页Journal of Signal Processing

摘　　要：利用Chirp信号调频斜率不变的特性,提出了一种基于调频斜率的自聚焦方法,该方法通过各个阵列的延时自相关将宽带chirp信号聚焦至与其调频斜率相关的固定频率上,然后在该固定频率上构造相关矩阵并运用music空间谱估计方法实现了对宽带Chirp信号的波达方向估计。该方法可以很容易消除阵元通道幅相不一致带来的影响,而且运算量相对于其它聚焦算法大大减少,具有很高的测向精度。最后通过仿真,验证了该算法的有效性。A self focusing method based on the wide-band Chirp Sources is proposed. Firstly, the wide-band signals are focused on the fixed frequency which has relationship with the chirp rate. Secondly, the correlation matrices are constructed on the fixed frequency, and the estimation of DOA is derived by MUSIC. This method can easily eliminate the influence of sensor gain and phase uncertainties, and has the characteristic of low computational cost and high precision of DOA. Finally, simulation results verify the validity of the method.

关 键 词：宽带CHIRP信号 自聚焦 波达方向估计 

分 类 号：TN911.7[电子电信—通信与信息系统]