根據在台南成大航太場所接收到的GPS衛星所接收到的資訊可以得到衛星的航行資料、虛擬距離與訊號的振幅值，由航行資料我們可以得知衛星的位置與仰角，由虛擬距離我們可以求出電波路徑的全電子含量，再經過運算可以換算為垂直的全電子含量，而由訊號的強度我們可以知道其S4 index，本篇文章將閃爍現象的強度與衛星軌道作套合，換算出不規則體的時間與空間上的發展情況，再與華衛一號所觀測到的軌道資料與電子密度資料作一比對，經由這方法可以了解到不規則體飄移情形。我們將可以進一步去判斷不規則體所在的位置。若同時有多顆衛星訊號，在距離相近的位置出現閃爍的情況，將有機會去判斷不規則體移動的方向。 According the data taller from GPS (Global Positioning System) system around Tainan. We calculate the total electron content (TEC) from pseudo range of the GPS signals caused by the delay of ionosphere. According to the carrier to noise (C/N) ratio of the GPS signal, we could estimate the S4 index which represents the degree of the fluctuation of the plasma irregularity in the path of GPS signal with the help of S4 index and the information of the orbit of GPS satellites, we can position the location of the plasma irregularity in the course of the satellite. Once the plasma irregularities are positioned. The spatial distribution of the ionospheric scintillation can thus be realized. Therefore, if we can develop a method to estimate the drift speed and direction of the plasma irregularity from GPS signals, it will be possible to forecast the occurrence of the ionospheric scintillation which will be beneficial to the improvement of the quality of the satellite communication.
