中文摘要：

均匀圆阵（UCA）是一种应用广泛的具有二位波达角估计能力的平面阵列。为了从理论上分析不同阵列参数下到达波方位角（AOA）、仰角估计精度，推导了均匀圆阵二维波达角估计的性能界，以此为基础分析了阵列孔径、阵元个数、快拍数以及来波仰角高低与到达角估计精度的关系，并通过对UCA．MUSIC算法计算机仿真验证了推导结果的正确性。研究结果为波达角估计类算法提供了可供参考的性能下界，圆阵设计时也不再需要大量的MonteCarlo仿真试验确定阵列参数，可直接从估计精度表达式中获得。

英文摘要：

Uniform circular array（UCA） is a kind of widely used planar array which provides 2-D angle of arrival （AOA）estimation. In order to analyze the precision of this estimation under different array shape, the perfor- mance bound for 2-D angle estimation with uniform circular array is deduced and influence of array aperture, el- ement number, snapshot and elevation angle on estimation accuracy is shown. Finally computer simulation of UCA-MUSIC algorithm is given to compare with the Cramer-Rao bound（CRB） derived. The conclusion provides a performance bound for AOA estimation algorithms and proposes a new method for UCA design instead of Monte Carlo simulations with large anlount of calculation.