利用双频GPS观测量对高原地区(昆明)电离层TEC的研究

Study on Ionosphere TEC in Altiplano Zone (Kunming) by Double Frequency GPS Observation

采用双频GPS观测值,在顾及GPS系统硬件延迟情况下,通过伪距与载波相位观测值联合解出TEC,并将其投影至高原(昆明地区)上空约350km的某一假想薄层上,从而导出接收站附近垂直TEC。这种方法得到的垂直TEC为天顶周围一锥角内的平均值,通过离散度的统计,并结合昆明站采集得到的高精度数据计算了该地区电离层2007年6～8月的电离层电子浓度总含量的逐日时间序列值,在此基础上对照昆明市连续运行参考站CORS描绘出了对于处在双驼峰区里该地区TEC日变化的特性。

The authors used double frequency GPS observation to work out TEC through pseudo range and carrier phase observation, while taking the delay of GPS system hardware into consideration. TEC was projected into an hypothetical layer about 350km above an altiplano zone（Kunming）. Consequently, the vertical TEC around the receiving station was exported. Through this method, the vertical TEC got is an average value of a prick angle around the vertex. With the statistics of dispersion and the high precision data collected in Kunming station, the authors calculated the day by day time sequence value of total electron content in ahiplano zone （Kunming） ionosphere. Based on this, they described the characteris- tics of TEC Sunday - changing in double - hump zone, comparing with CORS of Kunming.