Method for eliminating pump stroke noise in mud impulse signals by aid of adaptive filtering algorithms
A technology of adaptive filtering and mud pulse, applied in the direction of digital adaptive filter, adaptive network, impedance network, etc., can solve the problems of high noise intensity and unmeasurable mud pulse signal, and achieve high practical value, reliable filtering, The effect of improving the signal-to-noise ratio
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[0039] The method for eliminating the pumping noise in the mud pulse signal using the adaptive filtering algorithm described in this embodiment mainly includes three filtering steps of the adaptive notch filter, the adaptive noise canceller and the FIR low-pass filter, assuming that the frequency of the useful signal is 0.5Hz. The specific implementation steps are:
[0040] (1) The collected mud pulse signal is recorded as the original signal y(n), which includes useful signal, pumping noise, vibration noise and bit noise.
[0041] (2) The adaptive notch filter has two ways to realize its function: the first one is as figure 1 As shown, the main channel inputs the delayed signal of the original signal y(n), and the reference channel inputs x(n)=sin(2*π*0.5), then the output of the adaptive notch filter is the original signal without the useful signal Delayed signal, this signal will be directly used as the reference signal v of the adaptive noise canceller i (n) input to th...
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