Importance

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Abstract

In an apparatus of correcting a clock drift error, a receiver unit receives a first GNSS signal from a satellite. A Doppler correction unit obtains a first predicted frequency. A tracking unit can obtain a first tracked frequency. The satellite-positioning unit determines a clock offset based on a position fix. A computation unit calculates a first difference between the first predicted and tracked frequencies. When the receiver unit is turned off and then on for receiving a second GNSS signal from the satellite, the Doppler correction unit obtains a second predicted frequency, the tracking unit obtains a second tracked frequency, and the computation unit calculates a second difference between the second predicted and tracked frequencies. An error correction unit computes an estimated clock offset according to the clock offset, the first difference, and the second difference.

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First Claim