A frequency offset compensation method based on all phase FFT amplitude

Yingjie ZHU; Wuxiong ZHANG; Huiyue YI; Hui XU

doi:10.11959/j.issn.2096-3750.2022.00274

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A frequency offset compensation method based on all phase FFT amplitude

Intelligent Wireless Positioning and Tracking Technology | 更新时间：2024-06-05

- A frequency offset compensation method based on all phase FFT amplitude
- Chinese Journal on Internet of Things Vol. 6, Issue 2, Pages: 10-18(2022)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.11959/j.issn.2096-3750.2022.00274
  CLC： TN958.94
- Published：30 June 2022，
  
  Published Online：2022-06，
- 稿件说明：
移动端阅览
YINGJIE ZHU, WUXIONG ZHANG, HUIYUE YI, et al. A frequency offset compensation method based on all phase FFT amplitude. [J]. Chinese journal on internet of things, 2022, 6(2): 10-18.
DOI：

YINGJIE ZHU, WUXIONG ZHANG, HUIYUE YI, et al. A frequency offset compensation method based on all phase FFT amplitude. [J]. Chinese journal on internet of things, 2022, 6(2): 10-18. DOI： 10.11959/j.issn.2096-3750.2022.00274.

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。

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.

关键词

毫米波定位测距频率估计

Keywords

millimeter wavelocalizationdistance measurementfrequency estimation

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