Flicker Effect On Ranging Of Geostationary Meteorological Satellite Based On GPS In Guangzhou And Research On The Influence Of Flicker On The Ranging Of A Static Meteorological Satellite

South China is located in the northern peak area of the equator anomaly,where ionospheric scintillation occurs frequently.Ionospheric scintillation has a non-negligible impact on radio wave communications.As various types of navigation systems and satellite communications are increasingly used in the world,observing and studying the laws of ionospheric scintillation is of great significance.By analyzing the scintillation data...from January 2014 to December 2015 in Guangzhou station,South China,this paper extracted 4820 scintillation spectra and scintillation index and found that the scintillation in Guangzhou corresponds to the two typical scintillation spectra of the single power law spectrum and the dual power law spectrum.These two types of scintillation spectra can be subdivided into categories whose characteristics and causes were analyzed in this paper.At the same time,this paper also studied the relationships between the ionospheric scintillation and the range-finding anomalies of the FY-2 series of stationary meteorological satellites in Guangzhou was also analyzed.The main conclusions of this article fall into the following categories:1.The flicker in Guangzhou corresponds to the two typical scintillation spectra:singlepower rate and double power rate.The single power scintillation power spectrum can be subdivided into the first type and the second type,corresponding to some strong flicker in all medium scintillation and weak scintillation conditions.The characteristics of these two kinds of power spectrum are that the spectrum curve is flat or slightly upward at low frequencies while the high-frequency part is approximately linearly declining,and the shape of the low-frequency band is related to the strength of the anomalies of irregularities.The double-power scintillation power spectrum corresponds to most of the strong scintillation,including the third,fourth and fifth scintillation spectrum.The common feature of these three spectrum is that there are obvious spectral breaks in the high-frequency part.The third type of scintillation spectrum shows a decreasing trend in the low frequency band,and The increased power spectral density near the spectrum break frequency makes the low frequency spectrum index smaller than the high frequency spectrum index;the fourth type of scintillation spectrum shows an upward trend in the low frequency range,And it is formed by the multiple strong scattering of the ionosphere irregularity.The increase of spectral density at 1 Hz(1km scale)and higher frequencies especially indicates that ionospheric irregularities of large,medium,and small scales coexists simultaneously;dominant refraction scattering leads to the appearance of the fifth type of flicker double power law spectrum morphology,Where the presence of large-scale irregularities causes the low-band spectral index to be larger than the high-band spectral index.2.The spectral index n tends to increase with the increase of the flicker intensity.Spectral index ranging from 0.63 to 9.57,the mean spectral index value was 3.86,and the spectral index values were distributed between 0-6.The spectral index values of weak scintillation intensity were distributed between 0-7 and 83.4%.The spectral exponents distributed under strong flicker are between 5-10,and there is a certain positive correlation between the spectral index and the scintillation intensity,which further verifies that the spectral index n increases with the increase of the scintillation intensity.3.Several abnormal Range-finding event in the stationary weather satellite signal,especially in March and September.The geostationary satellite ranging anomaly events have a good correlation with ionospheric scintillation.The correlation coefficient exceeds 0.99 at the occurrence time and average time,and with the increase of ionospheric scintillation activity,the duration of the ranging anomaly phenomenon increase correspondingly.By comparing the chronological order of range-finding event occurrences of the FY-2F and FY-2E geostationary satellite ranging phenomena combined with the related theories of irregular body drift characteristics,the theoretical calculation results are in accordance with the actual observation results,which serves as evidence for the correlation between geostationary satellite ranging anomaly and the ionosphere flicker.