十字阵虚拟基线二维测向算法

A Two-dimensional Direction Finding Technique with Cross Array Based on Virtual Baseline Model

提出了一种利用虚拟基线变换估计信号到达角的方法,首先利用圆阵的对称性得到虚拟阵元与参考阵元的相位差,再利用真实阵元与虚拟阵元间的虚拟短基线得到无模糊的相位差估计,通过解长基线的相位模糊得到高精度的到达角估计值。该算法具有较高的估计精度和分辨率,仿真结果证明了文中算法的正确性和有效性。

A two-dimensional direction finding estimation algorithm using the virtual baseline transformation is proposed in the paper. Firstly,the phase differences between the virtual array elements and the reference array element are obtained by use of the symmetry of circular array,the unambiguous phase differences are achieved by using the virtual short baseline between the actual array element and virtual array element. The unambiguous phase differences are used to get rough but unambiguous estimates of direction of arrival（ DOA）,which are used as coarse references to disambiguate the cyclic phase ambiguities in phase differences between the actual array element and the reference array element. The high-precision estimations and high resolution of DOA are acquired. Simulation examples have verified the correctness and validity of our method.