中文摘要：

电离层总电子含量（TEC）是电离层探测的重要参量，也是电离层层析成像（CIT）技术的重要输入参量，它的精确确定对反演电子密度分布起到关键的作用。目前，中国地震局地震预测研究所、中国科学院上海天文台和温州大学三方联合在上海和温州建立了两个卫星三频信标接收站，用于中国中低纬区域电离层监测，其三频信标接收机为ITS33s。介绍了ITS33s系统的构成，包括硬件和软件的组成，以及台站接收的数据情况。利用观测数据，分析了电离层的相对总电子含量、三波段信号的相位和电离层振幅闪烁指数（S4指数）等参数的时空变化情况，并对观测到的电离层不规则体做了初步分析。

英文摘要：

The total electron content （TEC）, which is an important parameter of ionospheric research and the input of computerized ionospheric tomography technique, plays a key role in inversing the distribution of electron density in the ionosphere. Institute of Earthquake Science China Earthquake Administration, Shanghai Astronomical Observatory and Wenzhou University established two stations receiving the tri-band beacon signal of low orbit satellites to monitor China＇s middle and lowlatitude ionosphere. The receiver is ITS33s. The composition of ITS33s systems, which including hardware and software components, is described here. By using the observed data, the relative total electron content, the signal phase of the three bands, the ionospheric scintillation S4 index are studied in this paper.