一种改进的变步长LMS算法在天线失配通道校正中的应用

发布时间：2018-04-02 05:10

本文选题：通道失配　切入点：校正　出处：《纳米技术与精密工程》2017年06期

【摘要】：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.
[Abstract]:The different amplitude-phase characteristics between the antenna array channels will have a great impact on the performance of the antenna array. Therefore, the amplitude and phase characteristics of each channel should be corrected before it works. In this paper, the frequency independent constant channel mismatch between antenna array channels is discussed. Considering that antenna arrays often work in low signal-to-noise ratio (SNR) environments with severe interference noise, an improved variable step size LMS algorithm is proposed to correct the amplitude and phase of mismatched channels. In this paper, the error autocorrelation and amnesia accumulative mean are used to adjust the step size. The frequency independent channel mismatch can be well corrected. Compared with the variable step size LMS algorithm, the amplitude and phase accuracy can be higher in low SNR environment. It has the characteristics of faster convergence, smaller steady-state error, stronger anti-jamming ability, and is easy to be realized in engineering.
【作者单位】：精密测试技术及仪器国家重点实验室(天津大学);海克斯康测量技术(青岛)有限公司;
【基金】：国家自然科学基金资助项目(51375338)
【分类号】：TN820

【相似文献】