Method and system for estimating ionospheric delay using a single frequency or dual frequency GPS signal
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United States of America Patent
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Aug 24, 2004
Grant Date -
Jul 15, 2004
app pub date -
Jan 13, 2003
filing date -
Jan 13, 2003
priority date (Note) -
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Abstract
A global positioning system comprising: (a) a GPS receiver configured to (1) receive a plurality of signals from a plurality of visible GPS satellites, and (2) produce a plurality of pseudorange measurements from the received signals, the pseudorange measurements being indicative of the GPS receiver's position and having an amount of ionospheric delay error contained therein, (b) a processor configured to estimate the amount of ionospheric delay in the pseudorange measurements by (1) estimating an amount of global ionospheric delay attributable collectively to the plurality of visible GPS satellites, and (2) estimating a plurality of amounts of local ionospheric delays, each local ionospheric delay being attributable to a different visible GPS satellite. Preferably the processor implements the ionospheric delay estimations using a modified Kalman filter.
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