This paper describes a system for multi-position Doppler ionosphere sounding implemented at the beginning of 2018 in the Kharkiv region of Ukraine, the data processing technique and initial results of data analysis. The system comprises a high frequency (HF) transmitter and three receiving sites making almost a right triangle with catheti of 32.8 and 58 km. The transmitter continuously emitting a monochromatic signal of a ∼20 W power at a frequency in most cases slightly lower than foF2 is located in the city of Kharkiv. The foF2 value was permanently controlled by the ionosonde installed in about 45 km from the transmitter. We report and discuss the initial results of traveling ionospheric disturbances (TIDs) observations for three years since January 2018 until December 2020. Statistical distributions of the frequency of appearance, periods, horizontal speeds, and propagation directions of TIDs are presented. The range of their most probable wavelengths is from 120 to 260 km, while their propagation velocities are from 80 to 220 m/s. The preferred direction of the TID propagation changes during the daytime and shows a tendency to rotate clockwise in azimuth. Notably, such regular long-term measurements in the Eastern Europe have been carried out for the first time.

中文翻译：

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乌克兰电离层非均匀性高频多普勒探测的多位置设施

本文介绍了 2018 年初在乌克兰哈尔科夫地区实施的多位置多普勒电离层探测系统、数据处理技术和数据分析的初步结果。该系统包括一个高频 (HF) 发射机和三个接收站点，几乎是一个直角三角形，具有 32.8 和 58 公里的导管。在大多数情况下，发射器以略低于foF2的频率连续发射约 20 W 功率的单色信号，位于哈尔科夫市。该foF2值由安装在距发射机约 45 公里处的电离探空仪永久控制。我们报告并讨论了自 2018 年 1 月至 2020 年 12 月三年间行进电离层扰动 (TID) 观测的初步结果。提供了 TID 出现频率、周期、水平速度和传播方向的统计分布。它们最可能的波长范围为 120 至 260 公里，而它们的传播速度为 80 至 220 m/s。TID 传播的首选方向在白天发生变化，并显示出在方位角上顺时针旋转的趋势。值得注意的是，这种定期在东欧进行的长期测量是首次进行。