Device and method for continuous data acquisition

A computing device for generating an excitation signal for a first vibratory seismic source so that the first vibratory seismic source is driven with no listening time, the computing device comprising:

• an interface configured to,
• receive a first target spectrum for the first vibratory seismic source, and
• receive a first group of constraints for the first vibratory seismic source;
• and
• a processor connected to the interface and configured to,
• generate a first excitation signal for the first vibratory seismic source based on the first group of constraints and the first target spectrum,
• generate a first pseudorandom sequence in the time-frequency domain,
• apply a fast Fourier transform to the first pseudorandom sequence to obtain a first Fourier transform pseudorandom sequence,
• convolve the first Fourier transform pseudorandom sequence with one or more constraint reciprocal filters to obtain corresponding constraint signals (LD, LC, LV), wherein the one or more constraint reciprocal filters corresponds to a constraint that is a member of the first group of constraints,
• rescale the first Fourier transform pseudorandom sequence based on the constraint signals, and
• apply an inverse fast Fourier transform to the rescaled first Fourier transform pseudorandom sequence to create the first excitation signal,
• wherein first seismic traces recorded with plural receivers can be identified when the first vibratory seismic source is driven with no listening time, based on the first excitation signal.

A non-transitory computer-readable medium including computer executable instructions, wherein the instructions, when executed by a processor, implement a method for generating an excitation signal for a first vibratory seismic source so that the first vibratory seismic source is driven with no listening time, the method comprising:

• determining a first target spectrum for the first vibratory seismic source;
• setting a first group of constraints for the first vibratory seismic source;
• and
• generating a first excitation signal for the first vibratory seismic source based on the first group of constraints and the first target spectrum,
• wherein the step of generating comprises,
• generating a first pseudorandom sequence in the time-frequency domain,
• applying a fast Fourier transform to the first pseudorandom sequence to obtain a first Fourier transform pseudorandom sequence,
• convolving the first Fourier transform pseudorandom sequence with one or more constraint reciprocal filters to obtain corresponding constraint signals (LD, LC, LV), wherein the one or more constraint reciprocal filters corresponds to a constraint that is a member of the first group of constraints,
• rescaling the first Fourier transform pseudorandom sequence based on the constraint signals, and
• applying an inverse fast Fourier transform to the rescaled first Fourier transform pseudorandom sequence to create the first excitation signal, and
• wherein first seismic traces recorded with plural receivers can be identified when the first vibratory seismic source is driven with no listening time, based on the first excitation signal.