基于改进NLMS算法的通道校正技术研究

A Channel Calibration Solution Based on Improved NLMS Algorithm

在电子侦察中,由于数字接收机通道中的放大器、混频器中的本振以及低通滤波器等器件的非理想性,造 成了接收机通道之间的幅相不平衡现象,极大地影响了无源测向的精度。本文在自适应滤波理论的基础上,提出了一种基 于改进NLMS算法的自适应通道校正方法。改进的算法在无法得到信号先验信息的情况下,也能获得较快的收敛速度和较 小的失调量,完成通道校正过程。基于该算法的通道校正方法不需要参考信号,直接利用天线接收到的雷达信号完成自校 正过程。仿真结果表明,该方法能有效提高通道的幅相一致性,是一种较好的通道校正方法。

In electronic war, the passive direction suffers from the mismatches between the components of the amplifiers and the LOs and the LPFs in the channels. A feasible adaptive digital signal processing method, using improved NLMS algorithm, which gives a solution for the correcting channel mismatches in a EW receiver, has been proposed and implemented. It doesn＇t need reference signal and has been found to correct the channel imbalances efficiently.