Patent ID: 8923091
Filing Date: 2014-12-30
Classification: G01S,G01V

Abstract:
1. A noise-rejection system for an underwater cable, comprising: a particle-motion sensor disposed in an underwater cable and producing a raw sensor signal that includes responses to particle motion due to seismic events and cable motion; adaptive processing means using an adaptive dynamic model of the underwater cable to produce an estimated sensor signal from the raw sensor signal from the particle-motion sensor, wherein the estimated sensor signal represents an estimate of the response of the underwater cable to cable motion in the absence of seismic events; an acceleration-canceling hydrophone producing a hydrophone signal; a seismic event detector receiving the hydrophone signal, detecting seismic events from the hydrophone signal, and producing a seismic event signal indicating the presence of seismic events, the seismic event signal disabling the adaptive processing means from updating the adaptive dynamic model only during the seismic events; means for subtracting the estimated sensor signal from the raw sensor signal to determine the response to particle motion due to seismic events; means for combining the response to particle motion due to seismic events and the hydrophone signal to produce a seismic response signal.