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Automatic data acquisition method and system

  • US 4,042,906 A
  • Filed: 10/29/1973
  • Issued: 08/16/1977
  • Est. Priority Date: 10/29/1973
  • Status: Expired due to Term
First Claim
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1. In seismic data acquisition from a seismic prospect area, the method of:

  • a. establishing a slave station at a known location with respect to said area,b. establishing data acquistion units at each of a plurality of unknown locations in said area, which units sense ground motion and convert the same to a digital representation of such motion,c. setting a different response code into each of said units and said slave station,d. from a master station at a known location relative to said area periodically transmitting a spread sepctrum RF freeze signal followed by a series of channel sync pulses,e. at each of said units freezing the binary representation of motion in response to receipt of each of said freeze signal,f. receiving and counting said channel sync pulse at each said unit and at said slave station following each freeze signal,g. decoding the count of said channel sync pulses at each said unit and at said slave station,h. comparing the decoded count with said response codes,i. in response to coincidence between said decoded count and said response codes transmitting the frozen signal as spread spectrum RF pulses from each said unit followed by a like transmission of a signal from said slave station representing travel time from said master station to said unit to said slave station back to said master station, andj. at said master station multiplexing the responses received from said units and said slave station to a common data channel.

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