物联网学报 ›› 2022, Vol. 6 ›› Issue (2): 10-18.doi: 10.11959/j.issn.2096-3750.2022.00274

• 智能无线定位与跟踪技术 • 上一篇    下一篇

一种基于全相位FFT幅值的频率补偿方法

朱颖洁1,2, 张武雄1,3, 易辉跃1, 许晖1   

  1. 1 中国科学院上海微系统与信息技术研究所微系统技术实验室,上海 200050
    2 中国科学院大学,北京 100049
    3 上海微纳电子研发中心,上海 201210
  • 修回日期:2022-05-09 出版日期:2022-06-30 发布日期:2022-06-01
  • 作者简介:朱颖洁(1998− ),女,中国科学院上海微系统与信息技术研究所硕士生,主要研究方向为信号分析与处理
    张武雄(1985− ),男,博士,中国科学院上海微系统与信息技术研究所研究员,主要研究方向为5G蜂窝移动通信网、物联网、智能传感器等
    易辉跃(1970− ),男,博士,中国科学院上海微系统与信息技术研究所副研究员,主要研究方向为信号分析与处理、5G/6G无线通信等
    许晖(1976− ),男,中国科学院上海微系统与信息技术研究所高级工程师,主要研究方向为4G/5G/IoT无线通信
  • 基金资助:
    上海市自然科学基金资助项目(19ZR1454100);上海市2020年度“科技创新行动计划”基础研究领域项目(20JC1416504)

A frequency offset compensation method based on all phase FFT amplitude

Yingjie ZHU1,2, Wuxiong ZHANG1,3, Huiyue YI1, Hui XU1   

  1. 1 Key Laboratory of Science and Technology on Micro-System, Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences, Shanghai 200050, China
    2 University of Chinese Academy of Sciences, Beijing 100049, China
    3 Shanghai micro nano electronics research and development center, Shanghai 201210, China
  • Revised:2022-05-09 Online:2022-06-30 Published:2022-06-01
  • Supported by:
    The Natural Science Foundation of Shanghai(19ZR1454100);The Key Project of Science and Technology Commission of Shanghai Municipality(20JC1416504)

摘要:

距离测量是无线定位技术的重要组成部分而基于毫米波的测距精度取决于差频信号的频率估计,但是现有频率估计算法存在计算量大、精度低等问题。为了提高测距精度,对频率估计算法进行了深入研究,提出了一种基于全相位快速傅里叶变换(apFFT, all phasefast Fourier transform)幅值的频率补偿值和频率估计方法,提升了频率估计的性能。该方法首先基于全相位 FFT 和常规 FFT 频谱之间的关系,估计出信号幅值。而且,利用信号幅值、信号频谱幅值与频率补偿值之间的关系,采用牛顿迭代算法求解出频率补偿值。然后,利用频率补偿值对信号进行移频后再次估计频率补偿值,得到信号频率的最终估计值,并由此计算目标的距离。仿真结果表明所提方法比现有方法具有更高的距离测量精度。

关键词: 毫米波, 定位, 测距, 频率估计

Abstract:

Distance measurement is an important part of the wireless location technology.The ranging accuracy of millimeter wave based distance measurement depends on the frequency estimation accuracy of beat signals from the targets, but the existing frequency estimation algorithms have the shortcomings of either high complexity or low accuracy.In order to improve the ranging accuracy, the frequency compensation value and frequency estimation method based on all phase FFT amplitude was proposed to improve the performance of frequency estimation.Firstly, the signal amplitude was estimated based on the relationship between its all phase FFT and its conventional FFT spectrum.Moreover, using the relationship between the estimated signal amplitude, the signal spectrum amplitude and frequency compensation value, the frequency compensation value was solved by Newton iterative algorithm.Then, the frequency compensation value was used to shift the frequency of the signal, and the frequency compensation value was estimated again to obtain the final estimation value of the signal frequency, from which the distance of the target was calculated.Finally, simulation results were presented to show that the proposed method has higher distance measurement accuracy than the existing methods.

Key words: millimeter wave, localization, distance measurement, frequency estimation

中图分类号: 

No Suggested Reading articles found!