Analysis on ionospheric delay correction method of space-borne single-frequency GPS data

With the technology of standard point positioning based on C/A code received by low earth orbit(LEO), one of the ionospheric delay correction method,the method of ionospheric scale factor, was discussed. The computed ionospheric scale factor α using the mean and instantaneous value of F2 region maximum electron density height is 0.3~0.4 and 0.2~0.65 respectively, and the maximum difference between them reaches to 0.3. Comparatively, the latter coincides with the reality better, and it reduces the systematic error in the geodetic height direction by 0.05~0.3m. With the comparison to the standard point positioning based on ionosphere free combination of the dual-frequency code measurements, the method could eliminate the systematic error in geodetic height induced by the first order of ionospheric delay. And the method could adapt to the LEO altitudes of about 200~ 600km, but it's useless at the altitudes more than 700km.