Method and apparatus for correcting a reference clock of a GPS receiver

摘要

An approach is provided for correcting a reference clock of a GPS receiver. The approach involves determining one or more frequency offset values. The approach also involves determining one or more codes associated with one or more satellites. The approach further involves determining a second code associated with the one or more satellites. The approach additionally involves determining one or more delay values between the second code and the one or more first codes. The approach also involves determining one or more proportional values based on the one or more delay values and a determined correlation. The approach further involves determining one or more correlation peak values and determining one or more estimated frequency offset error values based on the one or more correlation peak values. The approach additionally involves causing a calibrated reference clock frequency value to change to a recalibrated reference clock frequency value based on the estimated frequency offset error values.

主权项

1. A method comprising:
determining one or more frequency offset values; determining one or more first codes associated with one or more satellites; determining a same second code associated with the one or more satellites; determining one or more delay values between the same second code and the one or more first codes; determining one or more proportional values based, at least in part, on the one or more delay values and a determined correlation between the one or more frequency offset values and the same second code; determining one or more correlation peak values based, at least in part, on the one or more respective proportional values and the one or more delay values; determining one or more estimated frequency offset error values based, at least in part, on the one or more correlation peak values; and causing, at least in part, a calibrated reference clock frequency value to be changed to a recalibrated reference clock frequency value based, at least in part, on the one or more estimated frequency offset error values.