标题： 天体力学通量分析仪（PFX）上捕获的Omega信号的自动检测 显示英文标题

标题： Automatic Detection of Omega Signals Captured by the Poynting Flux Analyzer (PFX) on Board the Akebono Satellite

摘要： 日本的Akabono卫星于1989年发射，用于观测地球的磁层和等离子层。Omega是一个导航系统，配有8个地面站发射器，其传输模式每10秒重复一次。从1989年到1997年，Akabono卫星上的PFX接收了来自这些站点的10.2 kHz信号。大量的PFX数据对于研究电离层和等离子层中VLF波的传播特性具有重要价值。在本研究中，我们介绍了一种系统地从PFX数据中自动检测Omega信号的方法，该方法包括识别发射站、计算延迟时间以及估计信号强度。我们展示了自动检测系统的可靠性，能够检测到Omega信号并确认其沿地球磁场线传播到相反半球。在超过三年（39个月）的时间里，我们分别在磁场和电场中检测到了43,734和111,049个信号，并证明所提出的方法足够强大，可以进行统计分析。 显示英文摘要

摘要： The Akebono satellite was launched in 1989 to observe the Earth's magnetosphere and plasmasphere. Omega was a navigation system with 8 ground stations transmitter and had transmission pattern that repeats every 10 s. From 1989 to 1997, the PFX on board the Akebono satellite received signals at 10.2 kHz from these stations. Huge amounts of PFX data became valuable for studying the propagation characteristics of VLF waves in the ionosphere and plasmasphere. In this study, we introduce a method for automatic detection of Omega signals from the PFX data in a systematic way, it involves identifying a transmission station, calculating the delay time, and estimating the signal intensity. We show the reliability of the automatic detection system where we able to detect the omega signal and confirmed its propagation to the opposite hemisphere along the Earth's magnetic field lines. For more than three years (39 months), we detected 43,734 and 111,049 signals in the magnetic and electric field, respectively, and demonstrated that the proposed method is powerful enough for the statistical analyses.