Method and apparatus for bounded time delay estimation

H - Electricity – 04 – W

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H04W 64/00 (2009.01)

Patent

CA 2721679

A method and apparatus for estimating the position of a mobile device in a multi-path environment. In one example, the method includes receiving a plurality of reference signals from a corresponding plurality of reference devices, for each reference signal, calculating expected time delay boundaries, for each reference signal, estimating a range between the device and the corresponding reference device based on a measured time delay of the reference signal falling within calculated time delay boundaries to produce a plurality of range estimates, and filtering the plurality of range estimates to generate a composite estimate of the position of the device.

L'invention concerne un procédé et un appareil destinés à estimer la position d'un dispositif mobile dans un environnement à trajets multiples. Dans un exemple, le procédé comprend les étapes consistant à recevoir une pluralité de signaux de référence en provenance d'une pluralité correspondante de dispositifs de référence, à calculer pour chaque signal de référence des limites attendues de retard, à estimer pour chaque signal de référence une portée entre le dispositif et le dispositif de référence correspondant en fonction du retard mesuré du signal de référence tombant dans les limites calculées de retard, afin de produire une pluralité d'estimations de portée et à filtrer la pluralité d'estimations de portée pour générer une estimation composite de la position du dispositif.

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