|本期目录/Table of Contents|

一种改进的变步长LMS算法在天线失配通道校正中的应用(PDF)

《纳米技术与精密工程》[ISSN:1672-6030/CN:12-1351/O3]

期数:
2017年6期
页码:
519-525
栏目:
出版日期:
2017-11-15

文章信息/Info

Title:
A Modified Variable Step Size LMS Algorithm Applied to Calibration of Mismatched Antenna Channels
文章编号:
1672-6030(2017)06-0519-07
作者:
刘培露1 李杏华1 李洪全2 郝健2
1.精密测试技术及仪器国家重点实验室(天津大学), 天津 300072; 2. 海克斯康测量技术(青岛)有限公司, 青岛 266101
Author(s):
Liu Peilu1 Li Xinghua1 Li Hongquan2 Hao Jian2
1. State Key Laboratory of Precision Measuring Technology and Instruments(Tianjin University), Tianjin 300072, China; 2. Hexagon Metrology Technology (Qingdao) Co., Ltd, Qingdao 266101, China
关键词:
通道失配 校正 变步长 LMS算法 低信噪比
Keywords:
channel mismatch calibration variable step size LMS algorithm low signal-to-noise ratio (SNR)
分类号:
TP274+.2
DOI:
10.13494/j.npe.20170004
文献标识码:
A
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 performance of antenna array is affected significantly by the mismatch of amplitude and phase among antenna array channels, so the mismatch must be calibrated before the antenna array functions. Given that the antenna array usually functions in low signal-to-noise ratio (SNR) environment with strong interference noise, a calibration technique based on modified variable step size LMS algorithm is proposed to calibrate the mismatch of amplitude and phase among antenna array channels. The modified algorithm uses autocorrelation error and residual accumulation average to adjust step size. Simulation results show that, compared with variable step size LMS algorithm, the modified variable step size LMS algorithm can calibrate the mismatch of amplitude and phase more accurately in low SNR environment, accomplish faster convergence, have less steadystate offset noise and stronger capability of antiinterference, and is easy to be implemented.

参考文献/References

备注/Memo

备注/Memo:
收稿日期: 2017-01-16. 基金项目: 国家自然科学基金资助项目(51375338). 作者简介: 刘培露 (1991—),男,硕士研究生. 通讯作者: 李杏华,副教授,lixinghua@tju.edu.cn.
更新日期/Last Update: 2017-12-21