System and method for fully self-contained calibration of an...

H - Electricity – 01 – Q

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H01Q 3/26 (2006.01)

Patent

CA 2334243

Systems and methods are disclosed for providing calibration of the phase relationships of signals simulcast from a transmission system. In a preferred embodiment, a calibration signal is introduced into the transmission system and provided to various antenna elements. Samples of the calibration signal are taken at a point very near the antenna elements so as to sample phase shifts introduced by the transmission system. The signals of sets of the antenna elements are combined after sampling for transmission down the antenna mast to the active circuitry of the present invention. Accordingly, the present invention operates to selectively energize antenna elements of the sets so as to provide a single calibration signal down the combined signal path. Through reference to sampled signals one at a time, the present invention determines a necessary phase adjustment to result in the desired phase relationship of the signals at the antenna elements.

La présente invention concerne des systèmes et des procédés permettant d'étalonner les rapports de phase de signaux émis simultanément à partir d'un système de transmission. Selon un mode de réalisation préféré, un signal d'étalonnage est introduit dans le système de transmission et transmis à divers éléments d'antenne. On prélève des échantillons du signal d'étalonnage en un point très proche des éléments d'antenne de manière à pouvoir échantillonner les déphasages induits par le système de transmission. Les signaux des batteries d'éléments d'antenne sont combinés après échantillonnage en vue de leur transmission vers le bas du mât d'antenne jusqu'au circuit actif de la présente invention. Cette invention consiste donc à attaquer sélectivement des éléments de la batterie d'antenne pour à obtenir un seul signal d'étalonnage le long du chemin de signal combiné. Par référence aux signaux échantillonnés les uns après les autres, l'invention permet de déterminer les ajustements de phase requis pour l'obtention du rapport de phase recherché entre les signaux au niveau des éléments d'antenne.

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