US 4,398,271 AGranted

Device for data transmission between seismic data acquisition devices and a recording device

AssigneesInstitut Francais du Petrole, Compagnie Generale de Geophysique

InventorsJacques Cretin, Claude Beauducel

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Abstract

A device for transmitting seismic data informations from acquisition devices of a seismic streamer to a central recorder an a ship, comprises at least two outward, and at least tow inward transmission lines made up of line sections interconnected by interconnection systems including means for the reconfiguration of signals, means for detecting order signals receives at said interconnection systems and switching means, and controlled by the detection means to connect different line sections, previously tested, and to by-pass faulty sections so as to form one outward and one inward continuous transmission line in good operating condition.

Claims21

Dependent claims

A device for transmitting information from a plurality of seismic acquisition devices to a central receiving and recording device (3), comprising:

a plurality of interconnection systems respectively associated with the data acquisition devices, and said interconnection system being serially connected respectively to a transmission line selection assembly (2) through at least two separate outward transmission lines made up of a plurality of sections, and to the central receiving and recording device through at least two separate inward transmission lines made up of a plurality of sections;
each interconnection system comprising means for detecting signals received on said outward transmission line sections reaching said interconnection system;
switching means, controlled by said detecting means, for directing the received signals or signals emanating from a seismic data acquisition device associated therewith, onto one of said outward or inward line sections from said interconnection system, and said switching means comprising a first switch (S4) for selecting one of said outward transmission line sections reaching the interconnection system, a second switch (S0) for connecting the transmission line section selected by the first switch when the device is in operation, or for connecting the output of the associated acquisition device, to one of the sections of the outward transmission line from the interconnection system, or to an input (e33) of a third switch (S3) whose other inputs are connected to the sections of the inward transmission line reaching the interconnection system, and with said third switch being adapted for directing signals received on one of its inputs onto the sections of the inward transmission line running from the interconnection system;
the line selection assembly being adapted for transmitting information or orders in the form of digital signals made up of bits series serially transmitted by a clock member and having a uniform structure or network made up of a first portion for validating the digital signals, a second portion employed for identifying the nature of the informations or orders transmitted in the digital signals as well as the interconnection system associated with said digital signals, and a third portion available for transferring data between the interconnection systems and the central receiving and recording device;
and said detecting means, for detecting the signals received on the outward transmission line sections reaching each interconnection system, comprising means (4,5) for reconstituting a clock signal, capable of being employed as a time basis, from digital signals transmitted on the outward transmission lines, an element (6) for detecting the clock signals and a circuit for the network recognition (9) associated with a decoding member (11) for recognizing the nature of the information or orders included in the received digital signals.

2 more elements

In a device for sequentially transmitting seismic data from a plurality of seismic data acquisition devices to a central receiving and recording assembly comprising a plurality of interconnection systems respectively associated with the data acquisition device, at least two different inward transmission lines made up of a plurality of sections for serially connecting the interconnection system to the central receiving and recording assembly, and at least two different outward transmission lines made up of a plurality of sections serially connecting the interconnection systems for transmitting control signals to said interconnection systems, the improvement comprising a transmission line selection assembly comprising means for selecting from the outward and inward lines sections one outward line and one inward line providing for a good transmission of control signals to the different interconnection systems and from said interconnection systems to the central receiving and recording assembly, said selecting means comprising detecting means in each interconnection system for detecting the signals received on the outward transmission line sections reaching said interconnection system, and switching means, controlled by the detecting means, for directing the received signals onto one of the outward or inward line sections running from said interconnection system, the selection of a single inward line and a single outward line providing for the subsequent sequential transmission of seismic data from the different data acquisition devices to the central receiving and recording assembly upon reception by the interconnection systems of control signals from the transmission line selection assembly.

Dependencies are inferred from the claim text.