Patent ID: 7911879

Claim:
A method of acoustic telemetry in a drill string in a wellbore, comprising: transmitting a coded acoustic signal related to a parameter of interest from a transmitting location into the drill string; detecting the coded acoustic signal at a receiving location; detecting signals at the receiving location, the detected signals including (i) a first time-series of measurements related to force applied to the drill string at the receiving location, and (ii) a second time-series of measurements related to motion of the drill string at the receiving location, said detected signals including noise from the receiving location; determining a drill string transfer matrix defining propagation of signals through a transfer interval between the receiving location and the transmitting location; determining a time-series related to acceleration at the transmitter location and a time-series related to motion at the transmitter location using the detected signals and the drill string transfer matrix; and estimating the coded acoustic signal using the determined time-series related to acceleration at the transmitter location and determined time-series related to motion at the transmitter location.