Signal design for controllable seismic source by pulse coding
脉冲编码可控震源信号设计

With the pulse coding technique, a series of pulses, which are produced by a controllable impact source and have the variable time intervals, are introduced into the ground. The seismic recording from a series of many low-power impact pulses can be transformed into a recording that is equivalent to the one from high-power impact pulse by using decoding techniques. The characteristics of seismic response to pulse coding signal are investigated by numerical simulating. The results show that the increment in the value of pulse interval between two neighboring impacts in a coded signal is a key factor for suppressing correlation noise. Changing the increment of impact interval is more sensitive to suppressing correlation noise than increasing the times of impacting. But repeated impact intervals do not have any effect on weakening the correlation noise.