测绘通报 ›› 2020, Vol. 0 ›› Issue (11): 71-75.doi: 10.13474/j.cnki.11-2246.2020.0357

• 学术研究 • 上一篇    下一篇

一种基于噪声统计特性的改进EMD降噪方法

鲁铁定1, 钱文龙1, 贺小星2,3, 乐颖1, 黄佳伟1   

  1. 1. 东华理工大学测绘工程学院, 江西 南昌 330013;
    2. 华东交通大学土木建筑学院, 江西 南昌 330013;
    3. 轨道交通工程信息化国家重点实验室, 陕西 西安 710000
  • 收稿日期:2019-12-06 出版日期:2020-11-25 发布日期:2020-11-30
  • 通讯作者: 钱文龙。E-mail:1186882089@qq.com E-mail:1186882089@qq.com
  • 作者简介:鲁铁定(1974-),男,博士,教授,主要从事测绘数据处理研究。E-mail:tdlu@whu.edu.cn
  • 基金资助:
    国家重点研发计划(2016YFB0501405;2016YFB0502601-04);国家自然科学基金(41464001);江西省科技落地计划(KJLD12077);江西省自然科学基金(2017BAB203032);轨道交通工程信息化国家重点实验室(中铁一院)开放研究课题(SKLK19-11)

An improved EMD noise reduction method based on noise statistical characteristics

LU Tieding1, QIAN Wenlong1, HE Xiaoxing2,3, LE Ying1, HUANG Jiawei1   

  1. 1. School of Surveying and Mapping Engineering, East China University of Technology, Nanchang 330013, China;
    2. School of Civil Engineer and Architecture, East China Jiao Tong University, Nanchang 330013, China;
    3. State Key Laboratory of Rail Transit Engineering Informatization, Xi'an 710000, China
  • Received:2019-12-06 Online:2020-11-25 Published:2020-11-30

摘要: GPS高程时间序列中通常都含有噪声,容易对GPS信号解算精度造成影响。针对这一问题,本文基于噪声统计特性,提出了一种改进的EMD降噪方法。首先将信号进行EMD分解,得到低频信号与高频噪声两个部分;然后将高频噪声部分随机打乱两次,并与原始高频噪声累加,求取平均值;最后与低频信号累加,构成一个新的信号再次进行EMD分解,提取出有用信号。最终利用模拟数据和WUHN站实测GPS高程时间序列数据对该方法进行验证。试验结果表明,当信噪比较高时,本文方法得到的降噪效果更佳。

关键词: EMD, 高程时间序列, 统计特性, 降噪分析

Abstract: The GPS elevation time series usually contains noise, which easily affects the accuracy of GPS signal solution. In view of this problem, this paper proposes an improved EMD noise reduction method based on the statistical characteristics of noise. Firstly this method decomposes the signal by EMD to obtain two parts of low-frequency signal and high-frequency noise. Then randomly shuffles the high-frequency noise part twice and accumulates with the original high-frequency noise to obtain the average value. Finally, it compares with the low-frequency signal add up to form a new signal and perform EMD decomposition again to extract the useful signal. Verification is performed using simulated data and measured GPS elevation time series data from WUHN stations. The experimental results show that when the signal-to-noise ratio is relatively high, the noise reduction effect obtained by this method is better.

Key words: EMD, elevation time series, statistical characteristics, noise reduction analysis

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