基于频域均衡的宽带阵列通道校正

通道失配会严重影响阵列天线的性能,需要校正失配.窄带阵列只需在中心频率上校正即可,而宽带阵列因带宽相对较大需要对整个通道特性采取均衡的方法来保证各通道间的幅度和相位一致性.首先建立了失配通道模型,然后介绍了基于最小二乘准则的频域均衡算法,最后通过计算机仿真验证了频域均衡算法的有效性.同时,新算法采用LFM信号作为校正信号,克服了时域校正时校正权值不收敛的问题.

Wideband Array Channel Calibration by Equalization in Frequency Domain

Channel mismatch would seriously affect the performance of the array antenna,it needs to be corrected.Narrowband array can be corrected only at the center frequency,while wideband array need to take the method of channel equalization to ensure the amplitude and phase characteristics of each channel kept consistent due to the bandwidth is relatively large.Firstly,the model of a mismatch channel is established.Then,frequency domain equalization algorithm based on least squares criterion is presented.Finally,the effectiveness of equalization algorithm is validated by computer simulation.Compared with the calibration algorithm in time domain,the proposed method could make sure the convergence for calibration weight vector.