Navigation system with error-detection on doppler...

Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite

Reexamination Certificate

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C342S357580

Reexamination Certificate

active

08072378

ABSTRACT:
A navigation system for detecting error on Doppler frequencies of a plurality of satellite signals measured by the navigation system is disclosed herein. The navigation system includes an offset calculator for calculating offsets of the Doppler frequencies of the satellite signals during a predetermined time period and calculating an average value of the offsets. The navigation system further includes an error detecting unit coupled to the offset calculator. The error detecting unit compares the offsets of the Doppler frequencies of the satellite signals with the average value of the offsets and determines whether the satellite signals are unavailable according to corresponding comparison results.

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Spangenberg et al., “Code Acquisition for LEO satellite mobile communication using a serial-parallel correlator with FFT for Doppler estimation”, Signals and System Group, Department of Electrical Engineering, University of Edinburgh, Scotland, undated but cited in 2005 article.

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