The ionosphere effects account for one of the most challenging error sources that can severely affect the performance of Global Navigation Satellite System (GNSS) applications. In the past a few decades, owing to the fact that the ground-and space-based GNSS data are rapidly growing, many researchers have developed and presented a series of theories, methods and techniques to weaken or eliminate the impact of ionospheric delay on GNSS user navigation and positioning, and achieved a number of

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... ortant achievements and progress. In this paper, a brief review is made towards study on GNSS ionospheric delay correction in China over recent years, with special attention focused on accurate extraction of ionospheric delay, modeling TEC and error analysis, and real-time ionospheric delay correction methods.