Patent ID: 8723725

Claim:
A method for ionospheric delay compensation from a single frequency signal in a satellite navigation system receiver, the method comprising: receiving a signal from a navigation satellite; selecting a first location as a function of a path of the signal from the navigation satellite to the satellite navigation system receiver; determining a first ionospheric delay based on the first location and corresponding to a signal having propagated from the navigation satellite to a location below the ionosphere; determining a scale factor corresponding to a ratio of an ionospheric delay in the vertical direction at a second location to an ionospheric delay in the vertical direction at a third location, the second location vertically below the first location and corresponding to an altitude of the satellite navigation system receiver, the third location vertically below the first location and corresponding to an altitude below the ionosphere; scaling the first ionospheric delay by the scale factor to determine a second ionospheric delay corresponding to the altitude of the satellite navigation system receiver; and applying a compensation for the second ionospheric delay to a measurement for the signal from the navigation satellite.