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Table 2 Accuracy evaluation of BeiDou global ionospheric model

From: Basic performance and future developments of BeiDou global navigation satellite system

Evaluation periodBDGIM assessed by CODG (data from 2019.07.01 to 2019.07.31)
ZonesIndicators≥ 15 TECu< 15 TECuTotal
Low latitudeBias/TECu− 5.45− 2.56− 3.35
STD/TECu2.752.212.70
RMS/TECu6.113.384.31
Per/%(72.45, 0.00)(60.97, 0.23)(64.13, 0.16)
Middle latitudeBias/TECu− 4.11− 2.16− 2.24
STD/TECu2.312.352.38
RMS/TECu4.723.203.27
Per/%(75.48, 0.00)(65.06, 0.70)(65.45, 0.67)
High latitudeBias/TECu− 4.03− 1.18− 1.18
STD/TECu0.551.541.54
RMS/TECu4.061.951.95
Per/%(74.53, 0.00)(69.63, 1.79)(69.63, 1.79)