Apparatus for and method of making pulse-shape measurements

H - Electricity – 04 – B

Patent

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H04B 1/7075 (2011.01) G01S 1/00 (2006.01)

Patent

CA 2522463

A receiver includes a pre-correlation filter that forms an image of the average chip shape of a received signal over a specified period of time. The filter includes an array of complex accumulation registers that accumulate measurements that are associated with signal samples from specific ranges of locations, or code chip phase angles, along a spread-spectrum chip. Using the accumulated measurements, the receiver estimates the location of the chip transitions in a direct path signal component. The receiver may thereafter change the starting point, size and number of ranges, such that the accumulation registers accumulate more detail from the chip edges. The receiver in addition may compare the accumulated measurements with a reference pulse shape to determine if any interference is present in the received transmission that will distort ranging information calculated from the received signal.

Selon l'invention, un récepteur comprend un filtre de précorrélation qui forme une image de la forme d'une bribe moyenne d'un signal reçu pendant une période de temps spécifiée. Le filtre comprend un ensemble de registres d'accumulation complexes qui accumulent les mesures qui sont associées aux échantillons de signal provenant de plages spécifiques d'emplacements, ou d'angles de phase de bribe de code, le long d'une bribe à spectre étalé. A l'aide des mesures accumulées, le récepteur estime l'emplacement des transitions de bribes dans une composante de signal à passage direct. Le récepteur peut ensuite changer le point de départ, la taille et le nombre des plages, de telle sorte que les registres d'accumulation accumulent plus de détails à partir des bords de bribes. Le récepteur peut en outre comparer les mesures accumulées avec une forme d'impulsion de référence pour déterminer tout interférence présente dans le signal émis reçu pouvant déformer les informations de distance calculées à partir du signal reçu.

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