Status and development of the ionospheric error correction techniques in satellite navigation

Ionospheric error seriously affects the positioning accuracy of the global navigation satellite system. GPS, BDS, Galileo and GLONASS all adopt different ionospheric error correction methods. The ionospheric error correction methods in satellite navigation are introduced, and the principle and development of single frequency ionospheric error correction, dual-frequency ionospheric error correction and multi-frequency ionospheric error correction are summarized in this paper. In the single frequency correction, the ionospheric error correction techniques in enhanced systems, BDGIM model, Klobuchar model, optimization of single frequency ionospheric error correction technology-IRI constraint model and NeQuick-G model are summarized; In the dual-frequency correction, the ionosphere-free model and the ionospheric error correction methods in the PPP-RTK technology are summarized; In the multi-frequency correction, the optimization and improvement of ionospheric error correction technique with the high order correction and geomagnetic field model are summarized. Finally, the ionospheric error correction techniques and their derivative are analyzed and encapsulated, the development trend and future hotspots of ionospheric error correction technology in satellite navigation are listed and analyzed.