A cycle slip detection threshold model to mitigate impact of geomagnetic storms on GNSS PPP
In order to reduce the cycle slip rate of carrier phase observations in geomagnetic storm conditions and improve the performance of global navigation satellite system (GNSS) precise point positioning (PPP),the paper proposed a cycle slip detection threshold model to mitigate the impact of geomagnetic storms on GNSS PPP:a threshold model for cycle slip detection considering the rate of total electron content index (ROTI) was constructed using a total of 3524 sets of observation data from 15 geomagnetic storm days at International GNSS Service (IGS) stations with different storm intensities,referred to as ROTI-based cycle slip threshold model (ROTI_CSTM);moreover,the ROTI_CSTM model was validated through PPP experiments using observation data from 158 IGS tracking stations under strong,moderate and weak storm conditions. Results showed that compared to the commonly used TurboEdit threshold for cycle slip detection,the global positioning system (GPS) PPP with ROTI_CSTM could improve the horizontal positioning accuracy by 16.98％,17.06％ and 52.44％ in weak,moderate,and strong storm environments,respectively,and the vertical positioning accuracy by 25％,16.39％ and 59.43％,respectively;furthermore,compared to the threshold model of the GAMP software,the horizontal positioning accuracy could improve by 4.04％,11.40％ and 20.90％ in weak,moderate,and strong storm environments,respectively,and the vertical positioning accuracy by 5.37％,7.75％,and 26.23％,respectively.
global navigation satellite system (GNSS)geomagnetic stormprecise point positioning (PPP)rate of total electron content index (ROTI)cycle slip detection threshold model
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