多站多路径GPS信号研究低纬电离层不均匀体  

Investigation of low-latitude ionospheric irregularities by using multi-station GPS multi-link signals

作　　者：甄卫民[1] 冯健[1] 陈丽[1] 韩一平[2] 

机构地区：[1]中国电波传播研究所,山东青岛266071 [2]西安电子科技大学理学院,陕西西安710071

出　　处：《电波科学学报》2007年第1期138-142,157,共6页Chinese Journal of Radio Science

基　　金：国家自然科学基金项目(40474061);国防科技电波环境特性及模化技术重点试验室基金项目(51486020305DZ3202)

摘　　要：发展了GPS信号的多站多路径监测方法,对我国低纬地区电离层不均匀体特性进行了研究。多站观测统计分析表明,尽管太阳活动已下降到中等程度,但电离层闪烁现象在位于赤道异常区的海口、广州等低纬地区仍经常发生,尤其在二分季前后闪烁发生率明显增大,且闪烁强度较大;通过GPS信号的多站多路径监测还发现,电离层不均匀体在东经105°～120°间,北纬27°以南区域出现频繁,而且在北纬23°以北区域的不均匀体易衰减并首先消失,在北纬20°～23°间区域内则会持续较长时间;进一步分析其闪烁功率谱,计算出了不均匀体的东向平均漂移速度。The ionospheric irregularities characters of low-latitude area of China is studied by empolying the monitoring method developed by using multi-station GPS multi-link signals. Although the solar activity has dropped to middle degree, statistical analysis of multi-station observations shows that the ionospheric scintillations often occur over the low latitude area of China, such as Haikou and Guangzhou, located at the equatorial anomaly, especially, occurrence is increasing and intensity is stronger of scintillation during the vernal and autumnal equinox. Based on multi- station GPS multi-link signals monitoring, these features are found that the ionospheric irregularities occur most often within the region of 105°～ 120°E and the south of 27°N, and the irregularities to the north of 23°N decay easily and disappear firstly, but those in the region of 20°～23°N can have a longer duration. Moreover, average eastward drifting velocity of the irregularities is calculated by the spectrum analysis.

关 键 词：GPS 低纬电离层 电离层闪烁 不均匀体 

分 类 号：O451[理学—无线电物理]