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GNSS Ionospheric Scintillation Models.
| 题名： | GNSS Ionospheric Scintillation Models. |
| 作者： | Tan, E. L. |
| 关键词： | Global navigation satellite systems, Ionization, Ionospheric scintillation, Equatorial regions, Statistical analysis, Coefficients, Frequency |
| 摘要： | This project first details the ionospheric scintillation analysis in Singapore based on the collected scintillation data in this region. It included the statistical analysis of scintillation parameters such as S4, phi60, and ROTI in Singapore. Relatively high scintillation parameters were observed in equinox months (March, April, September, and October). Diurnally, these scintillation events occur mostly around local time of 8 p.m. to 12a.m., which is during the post sunset period. It was also observed that high S4 was generally accompanied by high phi60, indicative of concurrently occurring amplitude and phase scintillations. Fluctuations in the ROT and high ROTI were also observed during this period, which shows the presence of plasma bubble irregularities in the ionospheric layer. Evidently, both signal intensity and the carrier phase of the GPS signal exhibited fluctuations during this period, which signifies propagation through the plasma bubble irregularities of the ionosphere layer. The project also investigated the applicability of existing scintillation models, such as frequency depend model and Fremouw and Rinomodels in the Singapore equatorial region. These models were further modified and improved based on the locally collected scintillation data. Subsequently, a Gaussian model was proposed to describe the scintillation behaviour in the Singapore equatorial region. The inputs to the Gaussian model are sunspot number and local time. The Gaussian coefficients were determined based on fitting of the 90th percentile of scintillation data in Singapore. For high scintillation activity months (i.e., the equinox months) and low scintillation activity months (i.e., summer and winter months), different sets of model parameters were obtained. Overall, it was found that the Gaussian model predicts the scintillation level in Singapore relatively well. |
| 报告类型： | 科技报告 |
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