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Some Applications of GPS Beacon on the Investigation of Ionospheric Properties

Author: XiongBo
Tutor: WanWeiXing
School: Wuhan Institute of Physics and Institute of Mathematics
Course: Space Physics
Keywords: Global Positioning System (GPS) beacon Ionospheric total electron content (TEC) Ionospheric scintillation
CLC: P352
Type: Master's thesis
Year: 2006
Downloads: 181
Quote: 3
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Abstract


GPS (Global Positioning System, referred to as GPS) is not only a powerful tool for precise navigation and positioning, and has been widely used in ionospheric research. By GPS beacon observing, can get the total content (TEC) of the electron concentration the satellite beacons signal-to-noise ratio (S / N), carrier-to-noise ratio (C / N), amplitude scintillation index S 4 closely associated with the state of the ionosphere parameters. Wherein, TEC is used to study the characteristics of the ionosphere, the S / N, C / N, S 4 used to study the characteristics of ionospheric irregularities. In this paper, a GPS beacon to carry out the study of the characteristics of regular and irregular structure of the ionosphere, major tasks: first, to participate in the China region ionosphere TEC is reported to work late and forecasting system developed, major contributions include GPS data listener software and GPS data processing software development, as well as in China, the real-time ionospheric TEC map web publishing; Second, the statistical analysis of the Caribbean MANA station GPS beacon S / N data to study the medium on the attenuation of the low ionosphere the GPS beacon propagation; flashing Hainan Sanya station GPS receiver received S 4 , C / N and TEC data comparative analysis of the ionospheric irregularities and characteristics. In the first work, we realized for the first time China's ionosphere TEC maps now reported (real-time). Through the second, three research work, we get a number of new conclusions are: (1) obtained from the GPS beacon signal-to-noise ratio in the diurnal variation of ionospheric radio attenuation characteristics. MANA (273.75 ° E, 12.15 ° N; geomagnetic latitude 22.50 ° N) located in the low latitudes station, GPS satellite beacon the S / N of attenuation in the radio wave through the ionosphere vertically, mainly due to the absorption of the ionosphere caused daytime large, small, evening maximum value obtained by our algorithm GPS satellite beacon S / N on the radio waves passing vertically through the attenuation with the local time of the ionosphere in the midday and afternoon from 1 to 3 hours; The relative changes in attenuation over the range of the relative change in the local time provided by IRI model electron concentration obtained are substantially the same, and the same trend. (2) analysis of the characteristics of diurnal variation and seasonal variation of Sanya ionospheric scintillation. Sanya (109.62 ° E, 18.34 ° N; geomagnetic latitude 7.61 ° N) region flicker occurs mainly in local time between 18:00 to 4:00 the next day, the incidence of flicker in the spring and fall than in winter and summer high, full years scintillation intensity has obvious changes in the six months maximum flashing intensity throughout the year, in spring and autumn. (3) analysis of the correlation between the GPS beacon carrier to noise ratio and amplitude scintillation index. Sanya area S 4 index and C / N has a negative correlation, correlation coefficient of -0.80424 whole year, summer and winter than in spring and autumn high correlation daytime correlation than the evening. (4) the rate of change of TEC Index (ROTI) amplitude scintillation the interrelated characteristics between the index. Statistics show that, S 4 scintillation event occurred and the chance to appear the ROTI flashing incident reached 60.95 percent for the year, to reflect the larger scale irregular structure of ROTI reflect small-scale irregular structure S < sub> 4 index closely associated, ROTI as an indicator of ionospheric scintillation. Work and results of this research show that the the GPS beacons observation is an important means to carry out regular and irregular structural characteristics of the study of the ionosphere, the type of observation and research on the understanding of ionospheric structure and disturbance has great significance, both the ionization layer radio wave propagation applied research also has practical value.

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CLC: > Astronomy,Earth Sciences > Geophysics > Space Physics > Ionospheric physics
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