Interference reduction method for downhole telemetry systems

US8942330B2 · kind B2 · utility

Assignee

• Baker Hughes Holdings LLC · US

Inventors

• Sanam Moghaddamnia · Hannover, DE
• Feng Zheng · Suzhou, CN
• Imed Ben Brahim · Hannover, DE
• Wojciech Emmerich · Celle, DE
• Christian Hansen · Hannover, DE
• Jens-Uwe Bruns · Burgdorf, DE

Key dates

• Filing date: Jan 18, 2012
• Grant date: Jan 27, 2015
• Expiry date: Apr 30, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G01V11/002
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for reducing interference in a received downhole telemetry signal includes: segmenting a received signal; windowing each signal segment; transforming each windowed signal segment into a complex variable domain to generate a plurality of complex variable domain segments with an in-phase component vector I and a quadrature component vector Q; calculating a real amplitude vector A from the I and the Q vectors; filtering interferers in the amplitude vector A for each complex variable domain segment to generate a filtered amplitude vector Ã; recalculating an amplitude of the amplitude vector A using the filtered amplitude vector à to generate an output amplitude vector Â; scaling the I and the Q vectors by a factor Â/A to generate an output in-phase component vector I′ and an output quadrature component vector Q′; and transforming I′ and Q′ into the time domain to provide an interference-reduced output signal in the time domain.