电离层闪烁对GPS系统定位性能的影响研究

Ionospheric scintillation effects on GPS positioning performance

电离层闪烁是影响卫星导航系统定位性能的重要因素之一。利用中国区域的电离层闪烁数据和GPS测量数据,从接收机码伪距测量性能、载波周跳检测、电离层延迟修正、精度因子变化等方面对卫星导航系统受到的电离层闪烁影响进行了分析研究,并对电离层闪烁情况下的用户定位性能进行了比较研究,结果表明:电离层闪烁一般情况下会引起用户定位误差的增大,严重时用户失去定位能力。电离层闪烁对用户定位的影响表现在多个方面,难以通过简单的模型进行修正。因此,电离层闪烁是影响GPS系统性能的重要因素之一。

The ionospheric scintillation is one of the error sources degrade the positioning performance of satellite navigation system. With the scintillation data and GPS measurements from China, we study the scintillation effects on the accuracy of GPS code measurement, effectiveness of cycle slip detection, accuracy of ionospheric delay correction, and variation of DOP firstly. Then we analyze the GNSS positioning performance under scintillation conditions. The results show that the positioning accuracy will he degraded generally; even no position could be fixed under strong scintillation. Scintillation would be one of the threats tO impair the GPS performance as tangled scintillation effects could not be compensated by a single method.