由GPS探测的电离层时空变化分析  

The Periodic Variations of Ionosphere Based on Wavelet Analysis of GPS Data

作　　者：李旺[1] 郭金运[1,2] 于学敏[1] 于红娟[1] 常晓涛[2,3] 

机构地区：[1]山东科技大学测绘科学与工程学院,山东青岛266590 [2]海岛(礁)测绘技术国家测绘地理信息局重点实验室,山东青岛266590 [3]国家测绘地理信息局卫星测绘应用中心,北京101300

出　　处：《测绘科学技术学报》2014年第6期561-565,569,共6页Journal of Geomatics Science and Technology

基　　金：国家自然科学基金项目(41374009);国家973计划项目(2013CB733302);公益性行业科研专项(201412001);山东省自然科学基金项目(ZR2013DM009)

摘　　要：为了研究局部区域电离层的周期性变化,建立精确的区域性电离层预报模型,根据全球TEC的空间分布规律,将全球划分为四大区域。采用小波分析方法对CODE提供的1999—2013年间的电离层网格数据进行了周期性分析。分析结果表明,电离层存在着26.5 d,0.5 a和1 a的显著周期。其中,26.5 d周期全球范围内显著;0.5 a周期在低纬地区显著;1 a周期在高纬地区显著。利用最小二乘谱分析对各周期振幅进行了分析,结果表明,26.5 d,0.5 a,11 a这3个周期的振幅呈现着由赤道向两极递减的趋势;1 a振幅在中高纬地区较为明显;0.5 a振幅在北半球较大,而1 a振幅在南半球较大。除此之外,各周期振幅在局部区域有异常现象。In order to study the local ionospheric periodic variation and build accurate regional ionosphere prediction model, the global ionosphere maps from 1999 to 2013 given by the Center for Orbit Determination in Europe（ CODE） were analyzed. According to the spatial distribution of ionosphere, global ionosphere was divided into four parts. The ionospheric periodic variation for each part was analyzed by using wavelet analysis. The results showed that there were 26. 5day period, 0. 5 year period and 1 year period, among which the 26. 5day period was significant on a global scale and the semiannual period was significant mainly in low latitude. On the contrary, the annual period was significant in high latitude regions. Then the amplitude of each period was studied by using the least spectral analysis. The results showed that the amplitudes of 26. 5day, 0. 5 year and 11 year periods progressively decreased from the low latitude to high latitude, and the annual amplitude was significant in middle and high latitude. What＇ s more, the semiannual amplitude was larger in the northern hemisphere, and the annual amplitude was larger in the southern hemisphere. Besides, the amplitudes were anomalous in some local areas.

关 键 词：电离层 小波分析 振幅 局部区域 最小二乘谱分析 

分 类 号：P228[天文地球—大地测量学与测量工程]