COURS DE TRANSMISSION PAR FAISCEAU HERTZIEN PDF
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Modern methods prospect, seismic we involve the use of data devices distributed at regular intervals over a d; stance of parfo; s several kilometers.
The d; fferent d; spos; t; fs acqu; sit; they are interviewed in sequence by the central laboratory and in response, transmit his digital stored data.
Each is then associated with a radio equipment. The transmission to the central laboratory of the collected data can be performed in real time and simultaneously for all the acquisition devices. On connait aussi notamment par ehrtzien brevet US n 3.
At the end of each recording session in the field or at regular intervals, the field team being replaced all recording tapes and reports the recorded tapes to the central laboratory or their contents are transferred to a unit of recording large capacity. PREVIOUS cited transmission systems have drawbacks related as much to the binding mode with the central laboratory that type of recorder available in each acquisition device.
Indeed the seismic operations are often conducted in areas where the local regulations concerning the use of Transm channels; ss; on; MPOSE of restr; ct; ons troublesome. Transm; ss; one of the data s; sm; c, when performed by radio, requires one or more transmission channels broadband it is sometimes difficult to obten r.
The C; l; sat; we reg; Streur in each of; spos; tif acquisition prevents the continued use if the total radio transmissions if Transm; delayed fission and thus facilitates the preparation of a shooting campaign. But because of this, we deprive ourselves of the benefits of constant monitoring. Tests are sometimes conducted before the start of each recording session on a seismic line, since Laborato; re central and vo; wireless e, to control the right of fonct1onnement reg; streurs.
Ma; s often very long these tests ra, his numbers appare; ls of acquired; t; is in; nterroger, can not be carried out so systemat; that. The cassette recorders being relatively slow transfer of seismic data to the central recorder often takes a considerable time.
C’est vra; It’s true; s; s; le transfert al;eu par vo;e hertzienne depuis chacun des dispositifs d’acquisition. This is also in the case where the storage cassettes one fo; s charged are returned to l2borato; re central and replayed one after the other.
The method and d; spositif according to the invention allow ev; ter them nconven; c ents; -Dessus ment; onnes. Preferably, the method of the invention oomporte transfer limited data representing the result of good tbd tests; onment each appare; l acquired; tion and qual; te s acquisition; sm; that in the; normal ntervalle between successive cycles of send-recept; on.
A memory of this type present numerous advantages. Its very short access time facilitates the management of stored data and their transfer. Its consumption Electr; that way; wheat is suitable for standalone acquisition devices Food once by batteries.
transmossion In a large capacity, it can memor; ser all recueill data; es hertzienn a session of mame explorat; one seismic. Such memory of this type is especially suited also to facilitate test operations on the memorized data. The combined use of a high capacity mass storage and high capacity enables easier and faster, late in the session, the collection of data stored by the different acquisition devices and the restoration of their storage capacity for a session-ment records later.
Preferably, the operation is further accelerated if one uses a system for transmitting high volume such as a light ray transceiver modules, or wideband radio waves, possibly a cable transmission or yet a magnetic connection through the casing of the acquisition apparatus. It should be noted that the short range required for the transfer by radio that the mass memory is brought close to each acquisition unit, makes possible the use of wide band radio transmission means and at very low power which do not require special administrative authorization.
Un meme appareil d’acquisition peut collecter les signaux provenant soit d’un recepteur unique, soit de plusieurs recepteurs. A same acquisition device may collect the signals either from a pr receiver or multiple receivers. In this case, the transmkssion signals are collected by multiplexing and sampling as is well known. These aircraft acquisition are contained in waterproof housings and possibly has associated buoys when deposited on the flooded lands. The acquisition represents A device in Figure hertzin for example has a single route entry to which is connected a seismic receiver R.
This memory is realized by combination of integrated circuits in number such that all the signals received during a same session of seismic exploration, can be stored. The capacity of the integrated circuit memory Elements is increasing. Currently several hundred kilobits, it should soon reach more; owers megabits or even ten to twenty megabits.
As couurs indicated, this type of memory is both, f, reliable, fast, efficient house in thrifty e and occupies an F; ble volume.
hettzien It is suitable to manage the conversion of the digital word signals, their transfer to the memory 4 and their subsequent replay. The signals exchanged between each acquisition device and the central laboratory can be more or less important depending on the case.
If the central laboratory exercises no control over the operation of acqu devices; sition acquired during a session; tion of data, exchanges signals are constituted mainly by signals; nit; al; sation at the onset of the seismic source T8 and by various acquisition signals retransmitted to the reception of these signals.
EP0361398A1 – Interface pour liaison asynchrone par faisceaux hertziens – Google Patents
If one wants to exert contrale the proper operation of each acquisition device during each session acqu; sition, we can use the time interval between two “shots” successive or longer momentary interruptions, for controlling a transfer to the central laboratory, control data, or optionally, in whole or in part, the seismic data collected during a “firing” one.
This transfer is effected by means fxisceau one or more radio channels standards whose use is easier to obtain than the channel wide band often necessary prospecting s; smique. Consider for example, a reception system including acquisition apparatus successively interviewed. Celui-ci interroge successivement les differents appareils d’acquisition. It successively examines the different acquisition devices. The computer 5 to the inside of dd device, at reception of a transfer command, controls the transfer to the radio transmitter 8 of the data read from the static memory 4 and relating to the transmission-reception cycle particul; st.
After each session reg; strat, static memory 4 of each acquisition device contains several tens of Mbits. It moves high parr recording system 9 successively to the vicinity of all devices using any vehicle adapted to the site, a boat, for example if the housings acqu fig. The acquisition apparatus then comprises also a transceiver of beams 12 controlled by the computer 5.
The optical transmission means may be replaced in the transfer unit 11, 12, by transmissin transmitter-receiver radio broadband whose transmission power is sufficiently low for it to be used without special authorization. A transmitter-receiver 1 GHz which could; t on is limited to mW, suitable for example for this application.
The portable recording system 9 having successively collected the accumulated data by all the acquisition devices, is brought back to the central laboratory and transfered contained in a mass memory and processed to obtain seismic recordings. A method of transmitting to a central device for recording data corresponding to signals received by an array of seismic sensors, which were sampled, digitized and stored by a plurality of data acquisition devices, tramsmission device for implementing.
It includes storing data in static memory disposed in each of said devices, the displacement field in the vicinity of each of them, at the end of each recording session, a mass memory associated with a device to transfer into the mass memory of the data collected by a link has high output cable, terrestrial broadband modulated light beams etc A relatively narrow band radio link provides direct transfers record data or tests between devices and central registration system.
Application de la prospection sismique. Application of seismic exploration. Method for transmission to a central device for recording seismic data collected by the acquisition devices distributed in the field and device for its implementation. Transmission having one central seismic data recording device, for signalsemitted by a set of probes.
Method and device initialization data acquisition devices, including seismic data. Information collecting and distributing system providing plural sources and destinations with synchronous alternating access to common storage.
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