| 摘要 |
An acoustic transmitting device 208 is coupled to a drillstring 202 and configured to transmit a communication signal along the drillstring 202 in a first direction, e.g. an uplink telemetry signal. First and second acoustic receiving devices 204, 206 are also coupled to the drillstring 202 and are arranged along the drill string 202 so that the first receiving device 206 receives the communication signal before the second receiving device 204. An electronics module coupled to the drillstring 202 is configured to produce a combined output of the first and second receiving devices 204, 206 so that the combined output excludes substantially all components of a contamination signal in the drillstring 202, e.g. noise, echoes, reflections, and the combined output includes substantially all components of the communication signal. |
