电离层闪烁对静止气象卫星通信影响的初步分析

Preliminary analysis of ionospheric scintillations effects on geostationary meteorological satellite communications

利用广州站监测到的GPS卫星和FY-2D静止气象卫星电离层闪烁数据,统计分析了广州地区电离层闪烁特征,并与静止卫星信号测距异常现象进行了相关性分析,初步探讨了电离层闪烁对静止卫星通信质量的影响.结果表明:广州地区电离层闪烁具有较强的季节依赖性,主要发生在春秋季节,约占全年90%左右,大多集中在夜间20:00-01:00LT,且持续时间长,空间分布广;电离层闪烁事件与测距异常现象具有较好的相关性,在发生时间和平均时间上,相关系数分别为0.9876和0.9966,在空间分布上,FY-2D和FY-2E的穿刺点经度不同,结合引起电离层闪烁的不规则体的漂移理论,理论计算由D星漂移到E星的时间与实际两星发生测距异常的时间差相符,进一步说明了电离层闪烁是引起FY-2D静止卫星测距异常,从而影响静止卫星星地通信质量的一个重要原因,并且受影响的程度随着闪烁强度的增强而增加.

Ionospheric scintillation characteristics and its effect on signal ranging anomaly of geostationary satellites are analyzed using ionospheric scintillation data of both GPS and FY-2D satellites recorded in Guangzhou Meteorological Satellite Ground Station- The results show that ionospheric scintillation has strong seasonal dependence over Guangzhou region which occurs in equinoctial mostly and most of the time is between 20：00-01.. 00LT, there is a good correlation between ionospheric scintillations and signal ranging anomaly of meteorological satellites, the correlation coefficients of occurrence time and average time can reach 0. 9876 and 0. 9966. In addition, ionospheric scintillations effect on signal ranging anomaly is also analyzed in space, the result calculated in theory is correspond to recorded data. All of these result can preliminary inferred that ionospheric scintillations is one of the most important reason which causes the signal ranging anomaly phenomenon, and then affect the quality of stationary satellite communication.