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The ways to detect ionosphericirregularities effects and construct a more effective bounding variance under ionospheric disturbance are presented in the paper.Ionospheric grid model is constructed to estimate the ionospheric delay and its bounding variance at grids.Then a chi-square detector is introduced to check the possible errors in measured ionospheric delays and the effectiveness of grid model.To improve the effectiveness of ionospheric error over-bounding,additional term for ionosphere spatial de-correlation is used with an enlarging factor under disturbance condition.The validity of the method is assessed with GPS data from China area.