Guangzhou Ionospheric Scintillation Monitoring Data Analysis And The Use Of Multi-satellite Signal Scintillation Monitors Algorithm

Ionospheric scintillation is a kind of rapid variation resulting from ionospheric irregularities in the amplitude and phase of radio signals passing through the ionosphere. Ionospheric scintillation changes with the latitude and longtitude, season and local time. This thesis contains two parts: one is about statistical analysis of ionospheric scintillations over Guangzhou station(23°8'N, 113°17'E), the other is for the arithmetic research on ionospheric scintillation information obtained multi-satellite signals.Background knowledge is summarized about the ionized layers and the ionospheric scintillation, as well as development of ionospheric scintillation research, the status of ionospheric scintillation's forecast, and the some problems needing further investigation. After that, GPS ionospheric scintillation monitoring system over Guangzhou region and the method of data gathering and handling are introduced. The statistical analysis of ionospheric scintillations on Guangzhou station (23°8'N, 113°17'E) during 2007.4-2007.9 and 2008.1-2008.9 shows that there are more ionospheric scintillations over Guangzhou region during geomagnetic quiet and low solar activity periods. The scintillations with S4>0.2 have high and stable occurrence rate in summer, and show no obvious daily variation. Most of them are weak scintillations, i.e., 0.2< S4≤0.4, and the maximum occurrence rate appeared one month earlier in summer of 2008 than that in 2007. In seasons other than summer, there is one occurrence rate maximum during the nighttime as reported in literature, while another one during the daytime is also found. However the latter needs further investigation.The different types satellite signals having different responses to ionospheric scintillation. Three kind satellite signals(GPS,Geostationary Satellite,Polar Orbital Satellite) are suggested to monitor ionospheric scintillations synthetically. We give the criterion of how to determine if one ionospheric irregularity is observed by different satellites.When one satellite are used, we can derive the position of the irregularities, while the spatial scale of the irregularities can also be known if the satellite is polar one; when two satellites data are used, we can know about the irregularities'position, scale and average angular velocity; when three satellites data are used, we can also know about the angular velocity and average angular acceleration; when four satellites data are used together, we can get some information of the irregularity evolution. While using data from more than one station, it is possible to know about the irregularities'length and height. By summarizing these analysis, a flow chart of monitoring ionospheric scintillation by multi-satellite signals was given for further reference.