常用宽带DOA估计聚焦算法的性能分析

Performance analysis of coherent subspace methods for direction of arrival estimation

建立了宽带阵列信号处理的模型,在此基础上,主要分析了宽带高分辨方位估计在不同聚焦矩阵下的几种相干信号子空间算法(CS)。进行了计算机仿真实验,在理论上分析和比较了各种方法的性能,并与克拉美—罗界(CRB)进行了比较。验证了宽带波达方向(DOA)估计算法的有效性。仿真结果表明:CSM算法的均方误差随着信噪比的增高而降低,特别是双边相干子空间方法(TCT),高信噪比条件下接近CRB。

The model of broadband array signal is established. Then, several coherent signal-subspace method （CSM） algorithms which use different focusing matrixes are discussed. The mean square error （ MSE ） of those methods is compared with Cramer-Rao Bound （CRB）by computer simulations. Results show that MSE of CSM methods decrease with increase signal-to-noise ratio （SNR）. Moreover, the MSE of two-sided correlation transformation（TCT） method is close to CRB at high SNR.