MULTIPLE TRANSMISSION PATH SEISMIC TELEMETERING SYSTEM

摘要

In a marine seismic data acquisition system, a plurality of seismic data transmission paths (23a-e) are utilized to conduct seismic data to a central recording unit (9) from seismic data acquisition modules (6) positioned along the length of cable (19). Signals from a plurality of data acquisition modules (6) are applied to each of the transmission paths (23a-e). Data acquisition modules (6) which apply seismic signals to a given transmission path (23a-e) may be spaced and substantially uniform distances along the length of the cable (19) and may be interspersed with data acquisition modules which apply seismic data to each of the other transmission paths. The operation of the data acquisition modules (6) is synchronized by means of a signal transmitted continually from a central recording unit (9). Each section (4) of the cable includes a plurality of remote units (18a-h) distributed along the cable section for detecting seismic signal. Each section includes a data acquisition module (6) which receives command signals from the central recording unit (9) and which receives seismic data signals from the remote units (18a-h) and transmits seismic data signals to the central recording unit (9).