4.
    发明专利
    未知

    公开(公告)号:NO993249L

    公开(公告)日:1999-08-26

    申请号:NO993249

    申请日:1999-06-29

    Abstract: A seismic ocean bottom positioning device include a series of seismic stations spaced apart at a predetermined interval along a cable. Each station includes a hydrophone, a motion sensing device such as a geophone and an acoustic positioning circuit. A preamplifier is coupled to a seismic channel. The hydrophone is also coupled to the seismic channel. An acoustic channel is also coupled to the preamplifier and coupled to the hydrophone.

    NOISE SUPPRESSION DURING SEISMIC EXPLORATION

    公开(公告)号:AU7120887A

    公开(公告)日:1987-09-28

    申请号:AU7120887

    申请日:1987-02-11

    Abstract: The system for suppressing an ambient noise signal which comtaminates a desired signal includes a noise pickup detector for detecting the ambient noise signal. A noise discriminator processes the detected noise signal into noise data. A reference noise generator converts the noise data into a reference noise signal. The noise generator automatically adjusts the reference noise signal to correspond with changes in the noise signal as it is being detected. A filter filters the reference noise signal into an error signal which is adapted to remove the noise signal from the contaminated signal. A cross-correlator cross-correlates the contaminated signal with the reference noise signal and adjusts the filter to produce the required error signal.

    6.
    发明专利
    未知

    公开(公告)号:NO993249D0

    公开(公告)日:1999-06-29

    申请号:NO993249

    申请日:1999-06-29

    Abstract: A seismic ocean bottom positioning device include a series of seismic stations spaced apart at a predetermined interval along a cable. Each station includes a hydrophone, a motion sensing device such as a geophone and an acoustic positioning circuit. A preamplifier is coupled to a seismic channel. The hydrophone is also coupled to the seismic channel. An acoustic channel is also coupled to the preamplifier and coupled to the hydrophone.

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