地球物理学进展 ›› 2018, Vol. 33 ›› Issue (4): 1351-1357.doi: 10.6038/pg2018BB0355

• 固体地球物理及空间物理学(大气、行星、地球动力学、重磁电及地震学、地热学) • 上一篇    下一篇

一种提取频高图中O波描迹新方法

胡辉,周晨,姜春华(),杨国斌,赵正予   

  1. 武汉大学电子信息学院, 武汉 430072
  • 收稿日期:2017-10-04 修回日期:2018-05-29 出版日期:2018-08-20 发布日期:2018-09-13
  • 通讯作者: 姜春华 E-mail:chuajiang@whu.edu.cn
  • 作者简介:胡辉,男,1993年生,湖北天门人,硕士研究生,研究方向电离层物理与电波传播和空间信号处理.
  • 基金资助:
    基国家自然科学基金资助项目(41604133);博士后基金(2016M592374);中央高校基本科研业务费专项基金资助项目联合资助

Method for automatic scaling of O wave traces from ionograms

HU Hui,ZHOU Chen,JIANG Chun-hua(),YANG Guo-bin,ZHAO Zheng-yu   

  1. School of Electronic Information, Wuhan University,Wuhan 430072, China
  • Received:2017-10-04 Revised:2018-05-29 Online:2018-08-20 Published:2018-09-13
  • Contact: Chun-hua JIANG E-mail:chuajiang@whu.edu.cn

摘要:

垂测仪是研究电离层中最常用的仪器之一,目前各国在世界范围内布设了大量的垂测仪来对电离层进行常规观测.而这些垂测仪每天都会记录大量的频高图数据,因此自动度量频高图算法的研究则成为如何高效利用大量频高图数据来研究电离层的重要基础.由于频高图中O波描迹的提取,对于研究不同电离层高度反射回波的扰动特征具有重要的意义,因此本文提出一种新方法用于从频高图中自动提取O波描迹.该方法基于滑动窗口和图像投影技术,首先确定O波和X波描迹的交叉点,然后在此基础上利用O波X波在频高图中的不同分布特征,单独提取出O波描迹,并利用局部加权回归算法对提取的描迹进行拟合.通过云南普洱站记录的频高图数据对该算法进行验证,将自动提取的描迹与人工提取的描迹进行对比,可接受的比例大约85.3%.对比结果表明本文提出的算法能够较好的提取频高图中的O波描迹.

关键词: 电离层, 频高图, 自动度量, O波描迹

Abstract:

The ionosonde is one of the most widely used instruments to study the ionosphere. Nowadays, many ground-based ionosondes have been installed over the world. A large amount of ionograms are therefore produced by these ionosondes, then, the research regarding automatic scaling of ionograms has become an important step for efficient use of a large number of ionograms to study the ionosphere. Because the extraction of O wave trace from ionograms is significant for investigating ionospheric disturbances, this paper proposes a new method for automatic extraction of O wave tracing from ionograms. The present method is based on the sliding window and image projection technology. First of all, we found the intersection of O and X wave traces from ionograms due to the characteristics of traces. Then, the initial O wave trace is extracted from ionograms. Finally, the method finds the best-fit trace using a local weighted regression algorithm. Ionograms recorded at Puer station are used to verify the performance of the present method. Ordinary wave traces extracted by this method are compared with those traces scaled manually by an operator,acceptable proportion about 85.3%. Results show that the proposed method can effectively extract O wave traces from ionograms when the ionosphere is during quiet periods.

Key words: ionosphere, ionograms, automatic scaling, O wave trace