Development of High-Precision Ionospheric Monitoring System in China: Taking ROTI Map as an Example

摘要

The ionosphere has always been one of the important error sources in GNSS navigation and positioning applications. The refined real-time monitoring of the ionosphere can provide more accurate information for calibration of ionospheric errors in high-precision positioning. Based on over 2,000 GNSS monitoring stations of the Beidou Ground-Based Augmentation System, this paper proposed a framework for the development of a high-precision ionospheric monitoring system in China, planning to provide a group of ionospheric products. Taking ROTI map as an example, the post-processing version has a spatial resolution of 0.2° in both longitude and latitude, with a temporal resolution of 30 s. The ROTI map with high-precision can not only indicate the area where the GNSS signal is severely affected by the ionosphere, but also provide an optimal strategy for satellite data selection in high-precision positioning applications.