Patent ID: 7741994

Claim:
A method for correcting ionospheric errors in a satellite positioning system (“SPS”) having a SPS server with known positional coordinates and a mobile SPS receiver, the method comprising: receiving SPS signals from SPS satellites at the SPS server; calculating a position of the SPS server using the SPS signals from the SPS satellites; comparing calculated positional coordinates of the calculated position of the SPS server with the known positional coordinates; determining ionospheric errors in response to comparing the calculated positional coordinates of the calculated position of the SPS server with the known positional coordinates; creating an ionospheric model of predicted ionospheric errors from the determined ionospheric errors, the ionospheric model having ionospheric model parameters; and transmitting the ionospheric model parameters to the mobile SPS receiver, where the mobile SPS receiver uses the ionospheric model parameters to create an SPS receiver ionospheric model.