基于阵列基线旋转的多目标DOA估计算法

传统均匀圆阵波达方向(direction of arrival， DOA)估计算法要求天线数目多于目标数量，易受阵列的通道不一致性影响。针对此问题，引入阵列基线旋转这一思想对多目标进行测向。通过旋转两天线阵列基线，并以固定的时间延迟对阵元的接收数据进行采样，相当于利用有限的两个阵元对目标进行多位置观测，增加了阵元的利用率，提高了DOA估计的测向精度。计算机仿真实验表明，该算法采用两阵元就可以实现多目标测向，其测向性能与基于均匀5元圆阵的传统多重信号分类算法相当，具有对多通道间相位不一致鲁棒性强的优点。

Multiple DOA estimation algorithm based on array rotation method

The direction detection performance of the traditional direction of arrival(DOA) estimation algorithm based on a uniform circular array is limited to the aperture of array and requires more antennas than targets. In order to solve this problem, a new algorithm which uses array basic-line rotation for multi targets estimation is proposed. Received data of the array unit are sampled by rotating the basic-line of two antenna array units and using fixed time delay. The utilization rate of the array unit is increased and the DOA estimation accuracy is improved by using two array units to achieve multi position observation. Computer simulation shows that this algorithm can achieve multi-targets direction by using two array units. Its direction detection performance is equal to that of the traditional multiple signal classfication (MUSIC) based on the uniform five circular arrays, which has advantages of good robustness on multi-channel phase inconsistence.