互耦条件下共形阵列DOA和极化参数的联合估计

Mutual coupling calibration algorithm for polarization sensitive conformal array

针对互耦条件下共形阵列信源方位和极化参数估计问题,结合有源校正给出一种有效的解决方案。论文充分利用锥面共形阵列的特殊结构,通过方向图的坐标系旋转建立了极化敏感共形阵列的互耦误差数据模型,并根据导向矢量与噪声子空间的正交关系建立了子空间拟合算法的优化函数。由于直接求解涉及到复杂的高维参数搜索问题,实现起来难度较大,论文通过合理近似给出了一种简化的线性方程组近似求解方法。仿真实验表明,所给方法能够很好地解决极化敏感共形阵列中的互耦校正问题,信源方位和极化参数联合估计的性能仿真结果进一步验证了算法的有效性。

To solve the problem of DOA and polarization estimation when mutual coupling effect existed,a method based on active calibration is proposed with conformal array antenna.First,we built the data model by radiation pattern coordinates rotation of each array elements,and on the basis of which,an optimization function is formed.After that,a simplified approximate solution is given by avoiding of multi-dimensional parameter searching,which reduces the computational burden evidently.Simulation results show that,the given method can solve mutual coupling calibration problem effectively,and DOA and polarization estimation performance further verify the conclusion indirectly.