Multi-channel acquisition device for radio transmitters

H - Electricity – 03 – B

Patent

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Details

H03B 7/08 (2006.01) G01D 4/00 (2006.01) G08C 17/02 (2006.01) H04Q 9/00 (2006.01)

Patent

CA 2659760

The present invention relates to a fixed receiving system (A) for a radio relay channel system for transmitting, on a fixed network, information transmitted on a unique wavelength .lambda. by a plurality of transmitters generally associated with measurement sensors, the transmitters being dispersed over a geographic area, to the receiving system (A) for the collection of all of the information transmitted in said geographic area. The system comprises at least two antenna (1) - receiver (2) pairs (I, II), each receiver (2) of said pair (I, II) only being associated with the single antenna (1) of the same pair (I, II), the output of each receiver (2) being connected to a single information acquisition controller (4), the antenna (1) of one pair (I, II) being placed at a distance of at least .lambda./4 of the antenna (1) of the other pair (I, II), in order to protect against the effects of null spots resulting from the mutual cancellation of waves originating from the same transmitter but having followed different propagation paths, and having undergone different and even opposite transformations in terms of amplitude and phase.

La présente invention concerne un système de réception fixe (A) pour système de transmission par voie hertzienne, en réseau fixe, d'informations émises sur une longueur d'onde unique .lambda. par une pluralité d'émetteurs généralement associés à des capteurs de mesure, les émetteurs étant dispersés sur une zone géographique, à destination du système de réception (A) pour la collecte de l'ensemble des informations émises dans la dite zone géographique. Le système comprend au moins deux couples (I, II) antenne (1) - récepteur (2), chaque récepteur (2) dudit couple (I,II) n'étant associé qu'à l'unique antenne (1) du même couple (I,II), la sortie de chaque récepteur (2) étant reliée à un automate (4) unique d'acquisition des informations, l'antenne (1) d'un couple (I,II) étant placée à une distance d'au moins .lambda./4 de l'antenne (1) de l'autre couple (I,II), afin de se prémunir des effets des "null spots" résultant de l'annulation mutuelle d'ondes provenant d'un même émetteur mais ayant suivi des chemins de propagation différents, et ayant subi des transformations différentes voire opposées en terme d'amplitude et de phase.

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