日本电离层频高图转换方法研究

Research of Ionospheric Ionogram Conversion in Japan

为了从日本电离层频高图中准确地获取特征参数和电子密度剖面,提出了利用数字图像处理等技术对频高图进行转换的方法。该方法是利用Radon变换、最大类间方差法和连通分量标记法等对频高图进行滤噪优化和格式转换。利用该方法开发出频高图批量处理软件,并结合SAO Explorer软件对日本Okinawa地区的频高图进行电离层特征参数的提取和电子密度剖面的自动度量实例分析,通过对转换前后特征参数f0F2的统计分析得到可接受率分别为52.1%和90.1%。结果表明,该方法具有较高的可靠性和精确性。

In order to get Ionospheric parameters and electron density from the ionogram in Japan, a new method for ionogram conversion based on image processing. Using of Radon transform, Otsu method and connected components labeling to digitize, optimize and convert the ionograms from the ionosphere. An analysis and conversion software has been developed for the ionogram through using the method, and then it utilizes the SAO Explorer software to automatically scale Okinawa ionospheric ionograms. The conversion results are compared with the original data, and the acceptability of f0F2 parameter are 52.1 percent and 90.1 percent. The results show that the method has good reliability and accuracy.