Interference detection technique

Details Interference detection technique Interference detection technique

H - Electricity

04

B

H04B 17/00 (2006.01) H04B 1/06 (2006.01) H04B 1/10 (2006.01)

Patent

CA 2083277

Briefly described, the present invention is a circuit for detecting and indicating a level of interference on a high frequency angular modulated signal. This circuit includes a logarithmic amplifier for receiving high frequency angular modulated signals and for providing a logarithmic amplifier output in response thereto. Next, the angular modulated signals are detected to determine a level of associated FM modulation thereof. Finally, a processor, programmed to distinguish those high frequency spectrum components due to interference from those due to other sources, determines a carrier to interference ratio. Of note, when the level of FM modulation at the logarithmic amplifier input exceeds a predetermined threshold, however, the associated carrier to interference ratio is ignored.

L'invention est un circuit de détection de brouillage et de mesure du niveau de brouillage dans un signal haute fréquence à modulation angulaire. Ce circuit comporte un amplificateur logarithmique qui reçoit les signaux haute fréquence à modulation angulaire et les amplifie logarithmiquement. Les signaux à modulation angulaire sont ensuite détectés pour que l'on puisse déterminer le niveau de la modulation de fréquence connexe. Finalement, un processeur programmé pour distinguer les composantes haute fréquence dues au brouillage des composantes provenant d'autres sources, détermine le rapport porteuse sur brouillage. On remarquera toutefois que le circuit de l'invention ne tient pas compte du rapport porteuse sur brouillage quand le niveau de modulation de fréquence à l'entrée de l'amplificateur logarithmique dépasse un certain seuil préétabli.

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