中文摘要：

为进一步了解多路径效应、衍射误差、电磁波信号干扰对GNSS信号的影响，利用TEQC软件对7种典型观测环境的实测数据进行了质量分析，结果表明：1）树林环境下能够接收到GNSS信号，但周跳、衍射误差及多路径效应最严重，数据质量差；2）无线通讯基站与雷达站附近的电磁波对GNSS信号有一定的干扰，而高压线形成的磁场对GNSS信号干扰影响很小；3）现代测地型天线可有效抑制位于天线水平以下水面的反射信号，但对来自玻璃幕墙的反射信号无抗干扰能力。

英文摘要：

Muhipath, signal diffraction and electromagnetic signal interference are the main factors to decrease the quality of GNSS data. All of these factors are related to the environment of the station. To know more about the relationship between the environment and data, the GNSS data collected from 7 stations in different environments are analyzed by using TEQC software and baseline solutions. The results show the following problems. 1 ） Cycle slip, signal diffraction and multipath effect are the most serious when the GNSS antenna under trees. 2） There is a certainextent of electromagnetic signal interference near wireless communication base station and radar station, but less under high voltage transmission line. 3 ） Modem geodetic antenna is immune to the reflected signal when the antenna is above the water surface, but power-less to the reflected signal from the glass curtain wall.