摘要:
地磁暴是近地空间经常发生的一种自然现象．发生磁暴时,电离层会发生明显的波动,导致电离层模型改正精度下降,进而影响单频用户定位解算结果．利用哈尔滨、北京、三亚三个地区的观测结果,计算了2017年4月地磁暴发生前后的电离层变化,并分别解算了双频模式、单频基本导航模式和单频增强模式下的伪距定位结果,对比了不同模式定位结果的差异．发现在地磁暴期间,双频定位结果最好,单频增强模式的结果稍逊于双频结果,两种模式一般优于单频基本导航模式．
Abstract:
Geomagnetic storms are a natural phenomenon that often occurs in the near-earth space. When a magnetic storm happens, the ionosphere fluctuates significantly,which leads to the reduction of the accuracy of ionosphere correction model and then affects the positioning result of single-frequency user. By using three stations’ observations of Harbin, Beijing and Sanya, we calculate the changes of ionosphere before and after a geomagnetic storm which occurs in April 2017, and then calculate the SPP results of dual-frequency mode, single-frequency basic navigation mode and single-frequency enhancement mode respectively. Comparing the results between different modes, and the results show that, during geomagnetic storms, the results of dual-frequency positioning are the best, and the results of single-frequency enhancement mode are slightly better than that of dual-frequency mode, and the two modes are generally superior to the basic single-frequency navigation mode.
百度学术
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