聚焦变换在MIMO阵列方位估计中的应用

Application of Focusing Transform in DOA for MIMO Array

摘要:

MIMO阵列是近年来信号处理领域提出的一种新体制阵列技术,可有效避免常规阵列中的相干源问题。为解决多载波造成的方位模糊,提出了一种基于聚焦变换的MIMO阵列目标方位估计方法。该方法将MIMO阵列接收信号分解为多个频率分量的信号,并通过聚焦算法将多个频率信号聚焦到同一信号子空间,然后对聚焦后的信号进行方位估计。仿真结果表明:与直接对MIMO阵列接收信号进行方位估计相比,该方法利用了MIMO阵列的回波不相干性和宽带信号能量,具有更好的分辨能力和更高的方位估计精度。

Abstract:

The concept of Multiple-Input Multiple-Output (MIMO) array is recently proposed as a new system of array technology in signal processing field, which could overcome the problem of coherent sources. A direction of arrival (DOA) estimation method based on focusing transform for MIMO array was proposed. This method decomposed the received signal to a set of frequency components, and focused these component singles to the same subspace through focuses transform, and the DOA of the focused signal was estimated finally. Compared with DOA estimation for MIMO array directly, the proposed method makes effect use of the incoherence of echo signals and wideband signal energy. Simulation results show that the method has better resolution and higher estimation accuracy.