A New Ionogram Automatic Scaling Method
A New Ionogram Automatic Scaling Method
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DOI：
10.1029/2018rs006574
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发表时间：
2018-09
期刊：
影响因子：
1.6
通讯作者：
Ziwei Chen;Zhaoqian Gong;Feng Zhang;G. Fang
中科院分区：
文献类型：
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作者：
Ziwei Chen;Zhaoqian Gong;Feng Zhang;G. Fang
电离层探测仪生成的电离图包含有关电离层的重要信息。电离图的定标和反演是理解电离图和监测真实的时间电离层的重要第一步。提出了一种基于中科院数字电离层探测仪的电离图自动定标算法。该方法主要利用图像识别技术、数学形态学和图论实现自动定标，并根据电离层特性确定关键参数。为了说明该算法的有效性，安装在怀来的中国科学院数字电离层探测仪的10，560个电离图（40.40°N，115.52°E），甘孜州（31.64°N，99.96°E），武汉以中国北部、南部和中部的南宁（30.52°N，114.31°E）、南宁（22.84°N，108.33°E）和厦门（24.26°N，118.04°E）为例，对新算法进行了测试。在自动缩放方面实现了良好的性能，其中foF1和foF2的值均与91.4%电离图的手动缩放值一致。其余的电离图几乎是不可扩展的手动由于痕量的同谋，需要大量的培训经验。
Ionograms generated by ionosondes contain significant information on the ionosphere. The scaling and inversion of the ionograms are important first steps for understanding the ionograms and monitoring the real‐time ionosphere. In this paper, a new algorithm is proposed to automatically scale the ionograms with separated O and X waves based on the Chinese Academy of Sciences Digital Ionosonde. The new autoscaling method is achieved mainly by the image recognition technique, mathematical morphology, and graph theory, and critical parameters are identified based on the ionospheric characteristics. To illustrate the efficiency of this algorithm, 10,560 ionograms from the Chinese Academy of Sciences Digital Ionosonde installed in Huailai (40.40°N, 115.52°E), Ganzi (31.64°N, 99.96°E), Wuhan (30.52°N, 114.31°E), Nanning (22.84°N, 108.33°E), and Xiamen (24.26°N, 118.04°E), in north, south, and central China, are used to test the new algorithm. A good performance in automatic scaling was achieved where the values of foF1 and foF2 both agree with the values of hand‐scaled for 91.4% ionograms. The remaining ionograms are almost unscalable manually due to the trace complicity that requires extensive training experience.