Analysis of undifferenced and uncombined precise point positioning performance under different geomagnetic storm intensities
In response to the problem that geomagnetic storms can affect the attitude of global satellite navigation systems,stimulate ionospheric disturbances,cause satellite signal loss and generate a large number of cycle jumps,and reduce positioning accuracy and reliability,this article starts from the needs of undifferenced and uncombined precise point positioning(PPP)users,and evaluates the performance of undifferenced and uncombined PPP under different geomagnetic storm intensities,using 110 international GNSS service stations uniformly distributed throughout the world as the research object. Research has shown that geomagnetic storms of different intensity levels have a certain impact on undifferenced and uncombined positioning,especially in high latitude and low latitude regions. Compared to no geomagnetic storms,the mean three-dimensional root mean square RMS of the positioning results increased by 151. 8％and 451. 8％,respectively,during the occurrence of large and super large geomagnetic storms. When a large-scale geomagnetic storm occurs,the reliability of positioning results severely decreases in areas with high vertical total electron content,and the three-dimensional RMS values of some stations may exceed 3 meters. In the study of the positioning impact of geomagnetic storms on the east,north,and zenith directions,it was found that they have the greatest impact on the accuracy of the north direction. Compared to the absence of geomagnetic storms,the mean three-dimensional RMS in the north direction increased by 168. 0％ and 542. 5％ respectively during the occurrence of large and super large geomagnetic storms.
geomagnetic storm intensitiesPPPundifferenced and uncombined modelVTEC
万方数据
维普
