Abstract: [Purposes] This paper aims to evaluate the enhancement effect of different ionospheric correction products on the performance of smartphone single-frequency GNSS standard point positioning. [Methods] It used Huawei Mate40 and vivo iQOO smartphones as test terminals.A comparative analysis was conducted on the performance in SPP using the broadcast ephemeris-based Klobuchar model and the real-time (RT-GIM),rapid (RAP-GIM),and final (FIN-GIM)global ionospheric map products provided by the International GNSS Service. [Findings] With the Klobuchar model,the positioning RMSE for the Huawei Mate40 and vivo iQOO smartphones were 3.85 and 8.25 m,and 5.76 and 8.33 m in the north and up directions,respectively.When using RT-GIM,they decreased to 2.35 and 6.61 m (Huawei Mate40),and 3.87 and 6.45 m (vivo IQOO).The use of FIN-GIM further optimized the performance to 2.29 and 6.42 m (Huawei Mate40),and 3.47 and 5.94 m (vivo iQOO),with RAP-GIM showing similar performance. [Conclusions] The IGS ionospheric products are significantly superior to the Klobuchar model,with FIN-GIM demonstrating the best overall performance,providing an effective reference for positioning in smartphones and other single-frequency GNSS terminals.

Key words: smartphone, standard point positioning, ionospheric delay, broadcast ephemeris, global ionospheric map