SU1236397A1 - Multichannel system for collecting and registering seismic information - Google Patents

Abstract

The invention relates to a digital information-measuring technique and can be used in automated systems for collecting geophysical information, having a large number of high-intensity data sources to be monitored, connected via telemetry two-wire, coaxial or fiber-optic communication lines. To expand the functionality of the system by providing remote changes in the system operation parameters while reducing the amount of equipment, the first and second parallel-serial buffer registers, the T-SHI circuit and the block of static modes registers were entered into the floor points. The information parallel inputs of the first and second buffer parallel-serial-registers are combined with the information parallel outputs of the analog-digital coding unit; the serial information outputs of the first and second buffer parallel-serial registers are connected respectively to the first and second inputs of the OR circuit, the output of which is connected with the information input of the encoder of the input data sequence of the transmitting data module of the floor point. The fifth and sixth outputs of the control signal distributor by the functional units of the floor station are connected respectively to the control inputs of the write (read) modes of the first and second buffers of 1x parallel-serial registers. The second output of the command decoder of the receiving command module is connected to the input of a block of static mode registers, the first, second and third outputs of which are connected respectively to the control inputs of the preamplifier unit with filters, the control signal distributor of floor-standing function blocks and the power supply disconnection input. 1 hp f-ly, 1 ill. with (L. ate "VA. Yu O5. 00 C J

Description

" one

The invention relates to a digital information-measuring technique that can be used in automated systems for collecting geophysical information, having a large number of high-intensity data sources to be monitored, connected via telemetry conductive, coaxial or voc-optical communication lines.

The purpose of the invention is to expand the functional capabilities by providing remote changes in the parameters of the functioning of the multichannel system for collecting and recording seismic information while reducing the amount of equipment.

The drawing shows a structural electrical circuit system.

The system contains a group of seismic detectors 1, a floor point (NP) 2 containing a block of 3 preamplifiers with filter m (PUF), a multiplexer of 4 channels, a block 5 of analog-digital coding, buffer parallel-serial registers, 6 and 7, the scheme OR 8 , distributor 9 of function block control signals, generator of 10 clock pulses, cycle control device 11, block 12 of static mode registers containing register 13 of gain and bandwidth codes, register I4 of control codes for selection of analog channels and regis Tr 15 control codes: power supply response times, transmitting data module 16, containing an input data sequence encoder 17 and transmitter 18, functional power supply bus 19, power supply disconnect device 20, tone receiver 21, reception, module 1 22 - mand, containing the decoder 23 commands and the receiver 24 commands, as well as the line 25 of communication (LAN).

The device works as follows.

After the placement and connection of remote NPs along the LAN, which determines the direction and size of the observation profile, a low-frequency signal, determined for the frequency and frequency, is sent from the central station to the receiver 2 of the tonal signal at the duty station. mode and ow 363972

The entire power supply unit is switched on with a single / closed unit in the specified mode, which switches the power supply device 20 off, from the output of the TO, power supply voltage is supplied to the power supply bus 19 connecting all the power supply functional units to the supply voltage required for their operation.

fO Thus, NP. goes into ac. active mode of operation. In this case, in block 12 of the static mode registers on all outputs, a state is established that determines the maximum bandwidth of the analog filters and the minimum gain of the FPS unit 3, which are necessary for operation with a maximum quantization interval, for example, 8 ms, time

20, the operation of the power-off device 20, which exceeds the doubled quantization interval, as well as the maximum number of polled channels in the monitoring circuit in the measurement and recording control cycle. At a time interval not exceeding the response time of the power off device 20, from the central station (CS) via communication line 23, the sync commands arriving at the input of the receiving module 22 of commands are output, whose output t they go to the cycle control device 1I, which the operation of the clock pulse generator 10 controls the distributor 9 of the control signals of the functional blocks, which, through the control outputs, switches the functional nodes of the NS 2 to the registration mode g of the monitoring seismic information Entering the group of seismic receivers I, excited via controlled, for example via radio, the seismic source.

During the time of one control observation cycle determined by the operator located on the CA, the central processor of the recording system processes the information coming from the floor points and determines the modes of operation of the NP 2 and the system as a whole. Then, the CA sends over LAN 25 in the time interval not exceeding the time of the failure of the NP power supply device 20 to turn off 20, the command word to be written in the block 12 of the static mode registers of each NP 2,

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corresponding to the selected mode of operation.

The control word contains the preamplifier gain and bandwidth codes of the analog filters of PUF unit 3, stored in register 13 of the gain and bandwidth codes of analog filters, channel selection control codes, stored in register 14 of control codes for selection of analog channels necessary for registration, and the same time management codes of the power-off device 20 stored in the register 15 of the time management codes of the power-off device 20. Moreover, the response time of the power-off device 20 TQ in this case will be related to the Tantant quantization interval

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where is the delay time not exceeding the minimum quantization interval.

Upon completion of the specified operation of setting the static parameters of each N 2, the system automatically enters the seismic information recording mode and writes a command word containing information about the static parameters into the buffer memory of the magnetic recorder CA, which is the initial marker for the data sequence of the registration cycle . It is possible to set static parameters without conducting a control cycle for recording seismic information. For this, the operator, who is at the central station, prior to placing the NI into the active mode of operation sets the necessary command word for writing to the register 12 of the static modes of the NP 2 manually using the console terminal according to a certain technique.

The seismic registration system in the registration mode operates as follows.

The central station sends to the link 25 the synchronization commands for launching all non-fixed transducers at time intervals determined by the operator’s predetermined method and sent to control device 11

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25

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cycla through the receiving module 22 commands.

Having received the start command. From the cycle control device 11, the distributor 9 of the function block control signals along the control lines transfers the NP 2 functional blocks to the write mode, and the information received from the group of seismic receivers 1 is amplified and filtered by the FPS analog filter 3, sequentially multiplexed or optionally multiplexer 4 channels according to the signals from the signal-controlled register 14 of the control codes for selecting the analog channels of the distributor 9 signals laziness functional blocks.

Multiplexed analog. The information from the output of the multiplexer 4 channels is fed to the input of the block 5 of analog-digital coding, controlled by the distributor 9 of the control signals of the functional blocks.

The coded information, containing the gain codes and the mantissa, in the parallel code from the output of the analog-digital coding unit 5. goes to the information parallel inputs of the first buffer parallel-serial register 6 and sequentially from each channel of the channel fininet in register 6 via control signals, received from the distributor 9 of the control signals of the functional blocks.

Simultaneously with the reception of a synchronization start command from line 25, the device 11 controls the cycles of each floor point 2 in accordance with the sequence number (dialed on the front panel of the NP) of the NP placement in the general structure defined by the CA, line 25 and the set of floor points 2, selects the appropriate time interval from the information transfer cycle of all floor points on the CA so that the possibility of overlaying information in the communication line 25 from each NP 2 is excluded.

In this case, the distributor 9 of control signals of the functional blocks outputs signals for reading information in the serial code from the corresponding output of the second buffer parallel-sequence

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register 7 which is recorded in the previous quantization interval and which through the OR 8 circuit arrives at the input of the transmitting module 16 of the outdoor station 2, whose operation is transmitted by signals from the function block control signal distributor 9, the serial information being encoded by the encoder 17 and transmitted to LAN 25 with transmitter 18.

With the arrival of the next start command from the CA, the buffer parallel-serial register 6, under the action of the control bus, outputs the information recorded in the previous coding cycle at the appropriate time in LAN 25, and the current encoded analog information is written to the buffer parallel-serial register 7.

In the absence of synchronization start commands in the registration mode, sent from the CA over LAN 25 due to the end of the registration cycle or if the communication channel is accidentally cut off after a time equal to T, the distributor 9 of the function block control signals will not confirm the operation of the system and thus provide the device with 20 o Switching off the power supply in standby mode, corresponding to a lean power supply disconnection, voltage from Shch1-1NY 19 power supply.

The first sync command word for triggering floor points coming from the CA over LAN 25 to each floor point is identified by the cycle control device 11 and the distributor 9 of the control function blocks of the floor point 2, as starting the W only for encoding analog information from a group of seismic receivers 1, and also for writing digital information to the first buffer parallel-serial register 6.

Thus, the multichannel system for collecting and recording seismic information allows remote control of the amplification factor of the preamplifiers and the bandwidth of the analog filters of the FPS block and thus allows working with a large number of quantization frequencies, as well as changing the response time of the power supply device at

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depending on the quantization period and increase the channel of the system by using the time previously spent on the transmission in each cycle of measuring the gain codes of the FPS block, which in the proposed system is used to connect additional channels, and also performs all the functions of the known system with a reduced amount of equipment.

Claims (2)

Invention Formula one . A multichannel seismic data acquisition and recording system containing a central registering station and a number of remote outdoor points subsequently connected to each other with the central recording station using a bidirectional communication line, each floor point containing a series of preamplifier units with filters, to the inputs of which a group of seismic receivers is connected, and the outputs are connected to the channel multiplexer, the output of the latter is connected to the analog unit digital coding, and also connected in parallel with the communication line, a transmitting data module consisting of serially connected input data sequence encoder and transmitter, a receiving command module consisting of serially connected communication line command receiver, and decoder , the first output of which is connected to the control input of the cycle control device, the sync input of which is connected to the output of the clock generator, and the output of the cycle control device is connected to the input of the control unit of the function control units of the floor-standing unit, the first, second, third and fourth outputs of which are connected respectively to the control inputs of the channel multiplexer, the analog-to-digital com- partment unit, the transmitting data module and the power-off device, the second control input of which is connected to the output the control tone receiver, the input of the latter is connected to the communication line, and the output of the power-off device is connected to the power supply bus item's outdoor units, characterized. In order to expand functional capabilities by providing remote changes in system operation parameters while reducing equipment, the first and second buffer parallel-sequential registers, the OR circuit and the block of static mode registers, and information parallel the inputs of the first and second buffer parallel-serial registers are connected to the information parallel outputs of the analog-digital coding block, Corresponding information outputs of the first and second buffer parallel-serial registers are connected respectively to the first and second inputs of the OR circuit, the output of which is connected to the information input of the encoder of the input data sequence of the transmitting data module of the floor point, fifth and sixth outputs of the signal distributor control of the functional units of the floor point are connected respectively with the control inputs of the write (read) modes of the first and second buffer pairs Editor N. Tupitsa Compiled by N. Zhuravleva Tehred M. Morgental Proofreader O. Lugov parallel-output register, the second output of the command decoder of the receiving command module is connected to the input of the block of registers of static modes, the first, second and third outputs of which are connected respectively to the control inputs of the preamplifier block with filters, the distributor of control signals of the function blocks of the floor point and the input of the disconnect power supply. 2. The system according to claim 1, wherein the block of static mode registers consists of successively connected three shift series-parallel registers of codes, amplification and bandwidth of analog filters, analog control codes, time control codes, respectively. actuation of the power off device, the outputs of which are connected respectively to the first, second and third outputs of the block of registers of static modes, the input of which is connected to the serial input of the register The country code controls the response time of the power outage device. Order 3086/48 Circulation 728 Subscription VNIIPI USSR State Committee for inventions and discoveries P3035, Moscow, Zh-35, Raushsk iab., d. 4/5 Production and printing company, Uzhgorod, st. Project, 4