一种新的波达估计方法

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。

A New Method of Estimating the DOA

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.