一种新的波达估计方法

A New Method of Estimating the DOA

分析了目前常用的波达角估计算法,研究了等距线阵和圆阵的特点,指出其存在关于横轴镜像对称信号源的空间模糊性,利用等距T型阵克服了这一困难。提出了一种新的基于训练序列波角达估计新算法,新算法基于如下假设:各个信号源的训练序列互相正交,并且各个信号源都是幅度为1的恒模信号。该文给出了新算法的数学推导过程,得到一个简单的波达角估计公式。应用Matlab对新算法进行了仿真,仿真结果表明新算法能够快速、精确地估计波达方向。

Since the most of existing algorithms of direction of arrival （DOA） have spatial ambiguity to the signals which are mirror symmetry, to x axis, T shape array is usually used to overcome the spatial ambiguity. In this paper, a new DOA estimation method based on train signal is proposed. The new method is based on the supposition： the training signals are mutually orthogonal and the magnitude of each signal is constant. The paper gives out the mathematical derivation of the new algorithm and gets a simple estimating formula. The simulation result shows that the new algorithm can estimate the DOA accurately and rapidly.