System and method for fast code phase and carrier frequency...

H - Electricity – 04 – L

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H04L 27/30 (2006.01) G01S 1/00 (2006.01) G01S 5/04 (2006.01) H04L 27/00 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2418855

A GPS receiver acquires carrier frequency and Gold code phase using short segments of a received GPS signal. In one embodiment, a 1-ms segment (604a) of the GPS signal (602) is transformed to the frequency domain (606/608). This is multiplied (610a) by a frequency representation of the Gold code (609). The resulting product is converted to the time domain (614), and a peak is detected (620). The location of the peak corresponds to the code phase. If no peak is located, the carrier frequency is changed. Full- and half-bin steps in carrier frequency are considered. Processing gain is achieved by using longer segments of the input signal, for example 4 or 16 ms and integrating 1-ms segments. Considerations are provided for compensating for the effects of a transition, should it occur in the short segment of the GPS signal being processed. Integrations can be performed using non-coherent and coherent techniques.

L'invention concerne un système et un procédé d'acquisition de fréquence porteuse et de phase code Gold à l'aide de segments courts d'un signal GPS reçu. Dans un mode de réalisation, un segment de 1ms (604a) d'un signal GPS (602) est transformé en domaine de fréquence (606/608a), puis multiplié (610a) par une représentation de fréquence du code Gold (609). Le produit résultant est converti en domaine temps (614), et une crête est détectée (620). L'emplacement de la crête correspond à la phase code. Si aucune crête n'apparaît, la fréquence porteuse est modifiée. Des étapes de bins ou de demi-bins dans la fréquence porteuse sont prises en compte. Le gain du traitement est effectué par utilisation de segments plus longs du signal d'entrée, par exemple 4 ou 16ms, et par intégration de segments de 1ms. L'invention concerne également des moyens permettant de compenser les effets d'une transition, si cela devait se produire dans le segment court du signal GPS traité. Les intégrations peuvent être effectuées par des techniques non cohérentes et cohérentes.

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