基于四阶累积量的幅相误差校正算法研究

Correction algorithm of amplitude and phase errors based on fourth-order cumulant

针对实际应用中普遍存在的阵列幅相误差扰动问题,以四阶累积量为工具,提出了一种幅相误差的有源校正算法。针对存在方位依赖阵元幅相误差的均匀圆阵模型,先利用有源校正方法对接收到的阵列流型进行校正,使得校正后的各个阵列的各个通道的增益和相位均达到一致,再对校正后的阵列流型采用四阶累积量的方法得到波达方向估计值。仿真实验验证了该算法具有良好的误差校正效果,能够比较准确地估计出波达方向角和幅相误差值。

Aiming at the widespread disturbance problem of amplitude and phase errors in practical application, a kind of active amplitude and phase errors correction algorithm is proposed based on the fourth- order cumulant. Aiming at the uniform circular array model which depends on the amplitude and phase errors. Firstly, the array flow pattern is corrected by the active element, and the gain and phase of each channel reach consensus. Then, the DOA is estimated based on the fourth-order cumulant. The simulation results manifest that the algorithm assumes good error correction effects and it is ahle to accurately estimate the azimuth and the amplitude and phase error value.