An augmented ionospheric delay correction method for low earth orbit satellite navigation in a global navigation satellite system (GNSS). The method comprises using a GNSS satellite navigation signal received by a low earth orbit satellite GNSS receiver load to provide navigation-augmented ionospheric information for an earth surface user. In the method, a low earth orbit satellite is used as a mobile navigation–augmented reference station to continuously observe a global ionospheric layer, generate ionospheric delay correction information, and send the information to ground users, so as to obtain augmented navigation performance. The ionospheric delay correction data provided by the method can implement global coverage instead of regional coverage, and in particular, can cover vast ocean areas. Ionospheric gradient data is provided, and the precision of ionospheric delay correction is thus improved. By means of on-orbit monitoring of ionospheric activity states and events, ionospheric delay correction completeness information is provided for the ground users.
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