Adaptive filtering with reference accelerometer for...

G - Physics – 01 – V

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G01V 1/36 (2006.01) G01V 1/48 (2006.01)

Patent

CA 2428969

A method for eliminating the tool mode signal from a received combined signal (120) including both tool mode and formation mode components, uses a signal from a reference receiver (112) that is consists primarily of the tool mode signal (122). A transfer function is derived relating the time reversed combined signal and the time reversed reference signal and used to predict the tool mode portion of the combined signal. Subtracting the predicted tool mode portion of the combined signal from the combined signal gives an estimate of the formation mode component.

Procédé servant à éliminer le signal de mode d'instruments dans un signal reçu combiné comprenant à la fois des composantes de mode d'instruments et de mode de formation, ce qui consiste à mettre en application un signal provenant d'un récepteur de référence et constitué d'abord par le signal de mode d'instruments. On calcule une fonction de transfert mettant en rapport le signal combiné inversé dans le temps et le signal de référence inversé dans le temps et on utilise cette fonction afin de prédire la partie mode d'instruments du signal combiné. La soustraction de la partie mode d'instruments prédite du signal combiné de ce signal combiné permet d'obtenir une évaluation de la composante de mode de formation.

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