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天线阵列通道之间幅相特性的不一致会对天线阵列的性能有很大影响,故在其工作前要对其各通道的幅度和相位特性进行校正.本文针对天线阵列通道之间与频率无关的恒定通道失配问题,考虑到天线阵列常常工作在干扰噪声比较严重的低信噪比环境下,提出了一种改进的变步长LMS算法对失配通道的幅度和相位进行校正.仿真结果表明,采用误差自相关和遗忘累加均值调节步长的本文算法,可以很好地校正与频率无关的通道失配,与变步长LMS算法相比,在低信噪比环境下所能校正的幅度和相位精度更高,具有收敛速度更快、稳态误差更小、抗干扰能力较强的特点,且易于工程实现.
The inconsistency of the amplitude and phase characteristics of the antenna array channels will have a great influence on the performance of the antenna array, so the amplitude and phase characteristics of each channel must be corrected before the antenna array channels are operated.In this paper, In order to solve the problem of constant channel mismatch, taking into account that the antenna array often works under low signal-noise ratio (SNR) environment where the interference noise is serious, an improved variable step size LMS algorithm is proposed to correct the amplitude and phase of the mismatched channel. , The error autocorrelation and forget cumulative mean adjustment steps in this paper can correct the channel mismatch with frequency unreasonably. Compared with the variable step size LMS algorithm, the amplitude that can be corrected in low signal-to-noise ratio And phase accuracy is higher, with faster convergence, smaller steady-state error, strong anti-interference ability, and easy to implement.