SYSTEM AND METHOD FOR UNDERWATER SEISMIC DATA ACQUISITION

摘要

A seismic source is provided that uses suitable low frequency acoustic transducers enabling a complex chirp to be used while increasing the effective power level and keeping the peak power down to a fraction of this effective power. The transducers can be driven using a pseudo-random coding of chirps that change frequency in each contiguous burst within the chirp and the interval between chirps varied to provide a pseudo-random duty cycle allowing multiple signals to be present in the water at the same time with a wider spectral coverage. By changing the timing of the drive signal for specific transducers, the direction of the source beam can be altered to steer the beam towards or away from certain objects or areas.