Patent ID: 8559275

Claim:
A method for generating a target output spectrum for use in seismic exploration to be achieved by a hydraulic seismic vibrator device, the method comprising: receiving constraint information related to the hydraulic seismic vibrator device; using a mathematical relationship for achieving the target output spectrum, wherein the mathematical relationship relates the (i) the constraint information of the hydraulic seismic vibrator device, (ii) the target output spectrum, and (iii) a frequency sweep rate; and determining in a processor-based device, based on the mathematical relationship, a frequency sweep for achieving the target output spectrum by the hydraulic seismic vibrator device in compliance with the constraint information of the hydraulic seismic vibrator device, wherein the mathematical relationship is given by: SR ( f )=β·[F constraint ( f )/ F target ( f )] 2 ·[F 1 −F 0] /SL, where f is an instantaneous frequency, SL is a sweep length with a start frequency F0 and an end frequency F1, F target (f) is the target output spectrum, F constraint (f) is a force constraint related to the constraint information, SR(f) is the frequency sweep rate, and β is a constant.