CN108828671A - High-precision degree passes formula seismic prospecting data collecting system - Google Patents
High-precision degree passes formula seismic prospecting data collecting system Download PDFInfo
- Publication number
- CN108828671A CN108828671A CN201810198754.0A CN201810198754A CN108828671A CN 108828671 A CN108828671 A CN 108828671A CN 201810198754 A CN201810198754 A CN 201810198754A CN 108828671 A CN108828671 A CN 108828671A
- Authority
- CN
- China
- Prior art keywords
- data
- acquisition unit
- acquisition
- circuit
- seismic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
- G01V1/3808—Seismic data acquisition, e.g. survey design
Abstract
The present invention relates to a kind of high-precision degrees to pass formula seismic prospecting data collecting system, and cost high power consumption is big when to solve the problems, such as that acquisition system carries out ocean progress earthquake data acquisition, including main control computer, acquisition unit, data packet and hydrophone and power supply；Main control computer completes the processing of seismic data, waveform shows and stores；Acquisition, storage and the communication function of acquisition unit realization data, the data acquisition circuit of acquisition unit is the control axis at earthquake-capturing station using high-precision adc ADS1282 and the fully integrated digital analog converter DAC1282 suitable for seismic test, on-site programmable gate array FPGA；When system works, main power source station sends the data frame packet comprising control command and synchronizing information to acquisition unit, collected data are packed into data frame packet in order and continue to transmit backward by data acquisition unit, power station carries out data processing and compresses subsequent resume to give subsequent data acquisition unit after receiving data frame packet.When ocean carries out earthquake data acquisition, there is the advantages of low cost, high-precision, low-power consumption.
Description
Technical field
The present invention relates to it is a kind of ocean carry out earthquake data acquisition seismic prospecting data collecting system, more particularly to
A kind of high-precision degree biography formula seismic prospecting data collecting system.
Background technique
With the rapid development of the national economy, the demand to marine resources is growing, the shortage of marine resources at
For the bottleneck of national sustained economic development, the external dependence degree of part ocean has arrived dangerous edge.Currently, both at home and abroad
The major part of exploitation is non-oceanic mineral resources within 1000m, is explored using non-seismic methods method, such as：Electrical method, electromagnetism
Method plays an important role in oil gas and Coal Exploration, and wherein oil-gas exploration about accounts for 90% or so of exploration total amount.With
Seismic exploration technique detection marine resources have some successful stories, but there are also many problems needs to overcome, mainly largely
Marine resources condition is complicated, is highly detrimental to the acquisition and processing of oceanographic data.Marine seismic prospectiong technology is at home and abroad located
In the starting stage, such as Canada, state of Australia is attempted in seafari using petroleum seismic technology in the world, it is domestic in
Ke Yuan, Di Ke institute etc. attempts oil exploration technology and engineering seismology technology in seafari respectively, but without obtaining good effect
Fruit.To find out its cause, due to the particularity of ocean sub-sea conditions, exploration have the characteristics that depth of exploration greatly, high resolution, routinely
Seismic exploration technology is not suitable for seafari.Therefore, the design of high-precision several biography formula seismic prospecting data collecting systems is compeled
The eyebrows and eyelashes.
There is presently no the seismic prospecting integrated systems specifically for hydrospace detection both at home and abroad, use oil and coal mostly
The instrument used in exploration, but these instruments there are volumes it is big, heavy the features such as, be not suitable for the seismic prospecting at Complex Sea bottom.
Compared to petroleum, natural gas and coal, the detection funds of ocean are typically small, so the high-precision oceanic earthquake for developing low cost is surveyed
Spy system is of great significance.
Summary of the invention
The object of the invention is that overcoming the drawbacks described above of the prior art, provide a kind of in ocean progress earthquake data acquisition
When, the high-precision degree of low cost, high-precision, low-power consumption passes formula seismic prospecting data collecting system.
To achieve the above object, it is to carry out earthquake in ocean that the high-precision degree of the present invention, which passes formula seismic prospecting data collecting system,
The seismic prospecting data collecting system of data acquisition mainly includes main control computer, acquisition unit, data packet and hydrophone and electricity
Source；Wherein, main control computer mainly completes the processing of seismic data, waveform is shown and is stored；Acquisition unit mainly realizes number
According to acquisition, storage and communication function, the data acquisition circuit of acquisition unit is using high-precision adc ADS1282 and suitable
For the fully integrated digital analog converter DAC1282 of seismic test, on-site programmable gate array FPGA is the control at earthquake-capturing station
Maincenter；Hydrophone is mainly used to sense seismic signal；Seismic wave information is to be acquired, put by the acquisition station of acquisition unit
Greatly, it filters, then digitized seismic signal is sent into the central recording unit of main control computer and is recorded；System work
When, main power source station sends the data frame packet comprising control command and synchronizing information to acquisition unit, and data acquisition unit will acquire
To data be packed into data frame packet in order and continue to transmit backward, power station is counted after receiving data frame packet
Subsequent data acquisition unit is given according to handling and compressing subsequent resume.And the acquisition of seismic data is the important skill of seismic prospecting
Art link, the quality that the technical indicator of acquisition unit acquires oceanographic data is most important, and the index of data acquisition unit is high
Low, the overwhelming majority depends on the selection of AD conversion unit, and therefore, emphasis of the present invention designs AD conversion unit,
Then Logical Design mode and PowerPC 405 based on FPGA is used to handle seismic data, in hardware aspect
The hardware size for successfully reducing the acquisition station circuit design, reduces costs and power consumption, is then transmitted by LVDS data
Mode carries out remote transmission, so that data transmission will be acquired to PC host.Data acquisition circuit uses Texas Instrument（Texas
Instruments）The high-precision adc ADS1282 of production and fully integrated digital analog converter suitable for seismic test
DAC1282.Since ADS1282 is integrated with simulant electronic switch, programmable amplifier and digital filter, therefore greatly simplifies
The complexity of circuit design, while also reducing power consumption.The invention has new breakthrough in resolution ratio and power consumption.With
When ocean carries out earthquake data acquisition, low cost, high-precision, the advantages of low-power consumption.
As optimization, acquisition unit is based on high-precision adc ADS1282 and fully integrated digital analog converter
The data acquisition circuit of DAC1282；Its major function is to receive the I/O control of on-site programmable gate array FPGA governor circuit
Logic and acquisition carry out analog-to-digital conversion to the electric signal of hydrophone response, and obtained digital signal sends FPGA master control to
Device processed carries out operation and processing；Control axis of the on-site programmable gate array FPGA as earthquake-capturing station, major function be to
Data acquisition circuit sends control instruction and provides related chip pin control logic level, is adopted needed for data acquisition with setting
Sample rate, sampling length are arranged preamplification gain and switching working mode and input channel, while receiving, analyze and forwarding from power supply
The data frame that station is transmitted.Data flow is after field programmable gate array FPGA chip is handled, and portion carries out Man Chesi in the chip
Spy encodes, and the data sent out after coding are converted to differential signal by LVDS chip, send later using network transformer isolation
Enter cable, is transmitted to inside next acquisition station.The power circuit of acquisition station is embedded into data acquisition board and field-programmable gate array
It arranges in FPGA master control borad, realizes the power supply mode similar to PoE, turn from transmitting to take electricity on big line and carry out a series of voltage
It changes, provides stable DC source for data acquisition circuit plate and on-site programmable gate array FPGA main control board.Wherein lead to
It crosses LVDS chip and is converted to differential signal, being sent into cable after being isolated using network transformer is by LVDS chip
SN65MLVDS200 is converted to differential signal, send later using 540042 WE-MIDCOM NL1548 of network transformer isolation
Enter cable.
As optimization, preposition amplification AMP, 24 Sigma-delta ADC's and digital filter are as data acquisition portion
Point, FPGA and LVDS transmission chip are as data processing and hop.
As optimization, using based on on-site programmable gate array FPGA Logical Design mode and PowerPC405 pairs
Seismic data is handled.
As optimization, data packet is according to the power reguirements of chip each on governor circuit and data acquisition circuit, using a system
Column super low-power consumption voltage conversion circuit.That is the design of power circuit is the key that realize data packet low power consumption.Data packet according to
The power reguirements of each chip on governor circuit and data acquisition circuit devise a series of super low-power consumption voltage conversion circuits.Number
Digital packets are alternatively referred to as according to packet.
As optimization, front-end processing is carried out to analog signal using pre-filter circuit in data acquisition unit, and use
The driving source switching circuit in actual acquisition channel and DAC TCH test channel.I.e. in data acquisition unit, in order to reach good acquisition
Effect devises pre-filter circuit and carries out front-end processing to analog signal, for the ease of to data acquisition circuit properties
The test of index devises the driving source switching circuit in actual acquisition channel Yu DAC TCH test channel.
As optimization, the main control module of acquisition unit using field programmable gate array FPGA chip 3C5T144C5N and
PowerPC405.Main control module uses field programmable gate array（FPGA）Chip 3C5T144C5N and PowerPC 405, both
The scale and complexity for reducing hardware circuit design, have been improved the reliability of system.
As optimization, data transmission circuit is realized using emulation LVDS transceiver and is passed with step number.Data transmission circuit uses
LVDS is realized to be passed with step number, to realize multiple tracks synchronous data collection by link.
As optimization, emulating LVDS transceiver is data flow after field programmable gate array FPGA chip is handled,
Chip interior carries out Manchester's code, and the data sent out after coding are converted to differential signal by LVDS chip, using net
Network transformer isolation is sent into cable later, is transmitted to inside next acquisition station.Differential signal is wherein converted to by LVDS chip,
It is to be converted to differential signal by LVDS chip SN65MLVDS200, then pass through that cable is sent into after being isolated using network transformer
It crosses 540042 WE-MIDCOM NL1548 of network transformer isolation and is sent into cable later.
As optimization, the pre-filtering of acquisition unit and channel switching circuit are that GEOH and GEOL connect hydrophone output respectively
Positive and negative anodes；Input voltage is limited between -2.5V to+2.5V by a pair of of BAV199 switching diode；Resistance R13, R14, R17,
R18 and capacitor C13 constitutes difference filter and removes high frequency normal mode ingredient from input signal；Capacitor C12, C14 and resistance
R14, R18 constitute common-mode filter, and high frequency common mode ingredient is removed from input signal；Resistance R15, R16 are set in input signal
Between bias level be ground level, while being flowed back to the composition biased electrical of the input terminal of ADS1282；AOUT2+ and AOUT2- connect
The analog input end of ADS1282.
The technical scheme adopted by the invention to solve the technical problem is that：Power circuit in data collection system is carried out
The design of low-power consumption；Data acquisition unit uses Texas Instrument（Texas Instruments）The high precision analogue of production turns
Parallel operation ADS1282 and fully integrated digital analog converter DAC1282 suitable for seismic test, since ADS1282 is integrated with simulation electricity
Sub switch, programmable amplifier and digital filter, therefore the complexity of circuit design is enormously simplified, while also reducing function
Consumption；Using based on FPGA Logical Design mode and PowerPC 405 seismic data is handled, improve data processing
Speed and precision.The hardware size of the data collection station circuit design is successfully reduced in hardware aspect, is reduced costs
And power consumption, remote transmission is then carried out by LVDS data transfer mode, so that data transmission will be acquired to PC host.The system
Have the characteristics that high-precision, low-power consumption, self-test, low cost, provides many conveniences for seafari, saved many manpowers
Material resources.
The working principle of the invention：System work when, main power source station to acquisition unit send comprising control command with it is synchronous
Collected data are packed into data frame packet in order and backward after resuming by the data frame packet of information, data acquisition unit
It send, power station carries out data processing and compress subsequent resume to give subsequent data acquisition unit after receiving data frame packet.
Main control computer carries out the records such as decoding decoding to data.Due to consideration that earthquake-capturing station inner space is extremely limited, therefore
Stacked design is used on hardware circuit, earthquake-capturing station is whole by data acquisition circuit plate and FPGA main control board
Group is combined into, and the I/O interface between them carries out vertical butt joint by 26 foot double-row needles of 2 2.54mm spacing.
Beneficial effects of the present invention：The invention has many advantages, such as high-precision, low-power consumption, low cost, portable, applicable Yu Haiyang
Seismic prospecting, the ADS1282 and core of the DAC1282 chip as acquisition station that data acquisition circuit is developed by TI company mention
The high resolution ratio and dynamic range of acquisition data；Logical Design mode based on FPGA, reduces the hard of circuit design
Part scale simultaneously passes through its correctness of experimental verification；The selection of the low power dissipation design of power module and ADS1282 chip in system, no
It reduced by only the usage quantity of battery, and reduce human and material resources and financial resources, also have enormous benefits to seafari work.
Detailed description of the invention
Fig. 1 is that the high-precision degree of the present invention passes the ground based on ADS1282 and DAC1282 in formula seismic prospecting data collecting system
Shake data acquisition circuit functional block diagram；Fig. 2 is that the high-precision degree of the present invention passes power circuit in formula seismic prospecting data collecting system
48V turn 3.3V isolation circuit schematic diagram；Fig. 3 is that the 3.3V of power circuit turns 2.V and 1.2V circuit diagram；Fig. 4 is power supply
The 3.3V of circuit turns+2.5VA circuit diagram；Fig. 5 is that the 3.3V of power circuit turns -2.5VA circuit diagram；Fig. 6 is power supply
The 2.5V reference voltage circuit schematic diagram of circuit.
Fig. 7 is pre-filtering and the channel switching circuit that the high-precision degree of the present invention passes formula seismic prospecting data collecting system
Schematic diagram；Fig. 8 is the fully integrated digital analog converter DAC1282 electricity that the high-precision degree of the present invention passes formula seismic prospecting data collecting system
Road schematic diagram；Fig. 9 is that the high-precision degree of the present invention passes high-precision adc ADS1282 in formula seismic prospecting data collecting system
Circuit diagram；Figure 10 is that the high-precision degree of the present invention passes on-site programmable gate array FPGA in formula seismic prospecting data collecting system
Governor circuit structural block diagram；Figure 11 is that the high-precision degree of the present invention passes emulation LVDS transceiver in formula seismic prospecting data collecting system
Circuit diagram；Figure 12 is that the high-precision degree of the present invention passes the LVDS that LVDS transceiver is emulated in formula seismic prospecting data collecting system
Interface isolates circuit diagram.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings:The high-precision degree of the present invention passes formula seismic prospecting data collecting system
System be ocean carry out earthquake data acquisition seismic prospecting data collecting system, mainly include main control computer, acquisition unit,
Data packet and hydrophone and power supply；Wherein, main control computer mainly completes the processing of seismic data, waveform is shown and is stored；
Acquisition unit mainly realizes the acquisition, storage and communication function of data, and the data acquisition circuit of acquisition unit uses high-precision mould
Number converter ADS1282 and fully integrated digital analog converter DAC1282 suitable for seismic test, on-site programmable gate array FPGA
It is the control axis at earthquake-capturing station；Hydrophone is mainly used to sense seismic signal；Seismic wave information is by acquisition unit
Acquisition station is acquired, amplifies, filters, and is then sent into digitized seismic signal in the central recording unit of main control computer
It records；When system works, main power source station sends the data frame packet comprising control command and synchronizing information, number to acquisition unit
Collected data are packed into order in data frame packet according to acquisition unit and continue to transmit backward, power station is receiving number
After frame packet, data processing is carried out and compresses subsequent resume to give subsequent data acquisition unit.And the acquisition of seismic data is
The important technical links of seismic prospecting, the quality that the technical indicator of acquisition unit acquires oceanographic data is most important, and data
The index height of acquisition unit, the overwhelming majority depend on the selection of AD conversion unit, and therefore, emphasis of the present invention is to analog-to-digital conversion
Unit is designed, and Logical Design mode and PowerPC 405 based on FPGA is then used to carry out seismic data
Processing, successfully reduces the hardware size of the acquisition station circuit design in hardware aspect, reduces costs and power consumption, then leads to
It crosses LVDS data transfer mode and carries out remote transmission, so that data transmission will be acquired to PC host.Data acquisition circuit uses moral
State instrument（Texas Instruments）The high-precision adc ADS1282 of production and complete or collected works suitable for seismic test
At digital analog converter DAC1282.Due to, ADS1282 is integrated with simulant electronic switch, programmable amplifier and digital filter,
Therefore the complexity of circuit design is enormously simplified, while also reduces power consumption.The invention has in resolution ratio and power consumption
New breakthrough.With when ocean carries out earthquake data acquisition, low cost, high-precision, the advantages of low-power consumption.
Specifically acquisition unit is based on high-precision adc ADS1282 and fully integrated digital analog converter DAC1282
Data acquisition circuit；Its major function be receive on-site programmable gate array FPGA governor circuit I/O control logic and
Acquisition carries out analog-to-digital conversion to the electric signal of hydrophone response, obtained digital signal send to FPGA master controller into
Row operation and processing；Control axis of the on-site programmable gate array FPGA as earthquake-capturing station, major function are adopted to data
Collector send control instruction and provide related chip pin control logic level, with set data acquisition needed for sample rate,
Sampling length is arranged preamplification gain and switching working mode and input channel, while receiving, analyze and forwarding and transmitting from power station
Data frame；Data flow is after field programmable gate array FPGA chip is handled, and portion carries out Manchester's code in the chip,
The data sent out after coding are converted to differential signal by LVDS chip, are sent into cable after being isolated using network transformer,
It is transmitted to inside next acquisition station；The power circuit of acquisition station is embedded into data acquisition board and on-site programmable gate array FPGA master
It controls in plate, realizes the power supply mode similar to PoE, take electricity from the big line of transmission and carry out a series of voltage conversion, be data
Collecting circuit board and on-site programmable gate array FPGA main control board provide stable DC source.Wherein pass through LVDS chip
Differential signal is converted to, cable is sent into after being isolated using network transformer to be converted by LVDS chip SN65MLVDS200
For differential signal, cable is sent into after being isolated using 540042 WE-MIDCOM NL1548 of network transformer.
Specifically preposition amplification AMP, 24 Sigma-delta ADC's and digital filter as part of data acquisition,
FPGA and LVDS transmission chip is as data processing and hop.
Specifically using based on on-site programmable gate array FPGA Logical Design mode and PowerPC405 over the ground
Shake data are handled.
Specifically data packet is surpassed according to the power reguirements of chip each on governor circuit and data acquisition circuit using a series of
Low power consumption voltage conversion circuit.That is the design of power circuit is the key that realize data packet low power consumption.Data packet is according to master control
The power reguirements of each chip on circuit and data acquisition circuit devise a series of super low-power consumption voltage conversion circuits.Data packet
Alternatively referred to as digital packets.
Front-end processing is carried out to analog signal using pre-filter circuit specifically in data acquisition unit, and using practical
The driving source switching circuit of acquisition channel and DAC TCH test channel.I.e. in data acquisition unit, in order to reach good acquisition effect
Fruit devises pre-filter circuit and carries out front-end processing to analog signal, for the ease of referring to data acquisition circuit properties
Target test, devises the driving source switching circuit in actual acquisition channel Yu DAC TCH test channel.
Specifically the main control module of acquisition unit using field programmable gate array FPGA chip 3C5T144C5N and
PowerPC405.Main control module uses field programmable gate array（FPGA）Chip 3C5T144C5N and PowerPC 405, both
The scale and complexity for reducing hardware circuit design, have been improved the reliability of system.
Specifically, data transmission circuit is realized using emulation LVDS transceiver and is passed with step number.Data transmission circuit uses
LVDS is realized to be passed with step number, to realize multiple tracks synchronous data collection by link.Emulating LVDS transceiver is that data flow through
After crossing field programmable gate array FPGA chip processing, portion carries out Manchester's code, the data sent out after coding in the chip
Differential signal is converted to by LVDS chip, cable is sent into after being isolated using network transformer, is transmitted to next acquisition station
It is internal.Differential signal is wherein converted to by LVDS chip, being sent into cable after being isolated using network transformer is to pass through
LVDS chip SN65MLVDS200 is converted to differential signal, using 540042 WE-MIDCOM NL1548 of network transformer every
Cable is sent into from later.
Specifically the pre-filtering of acquisition unit and channel switching circuit are that GEOH and GEOL are connecing hydrophone output just respectively
Cathode；Input voltage is limited between -2.5V to+2.5V by a pair of of BAV199 switching diode；Resistance R13, R14, R17, R18
Difference filter is constituted with capacitor C13, and high frequency normal mode ingredient is removed from input signal；Capacitor C12, C14 and resistance R14,
R18 constitutes common-mode filter, and high frequency common mode ingredient is removed from input signal；The centre that resistance R15, R16 set input signal is inclined
Setting level is ground level, while being flowed back to the composition biased electrical of the input terminal of ADS1282；AOUT2+ and AOUT2- meet ADS1282
Analog input end.
Below for attached drawing, the invention will be further described:
Fig. 1 is that the data based on ADS1282 and DAC1282 are adopted in the high-precision degree biography formula seismic prospecting data collecting system of the present invention
Collector schematic diagram.Its major function is to receive the I/O control logic of on-site programmable gate array FPGA governor circuit and adopt
Collection order carries out analog-to-digital conversion to the electric signal of hydrophone response, and obtained digital signal sends the progress of FPGA master controller to
Operation and processing.FPGA is the control axis at earthquake-capturing station, major function be sent to data acquisition circuit control instruction and
Related chip pin control logic level is provided, to set the required sample rate of data acquisition, sampling length, preamplification gain is set
With switching working mode and input channel, while the data frame transmitted from power station is received, analyzes and forwarded.Data flow is passed through
After fpga chip processing, portion carries out Manchester's code in the chip, and the data sent out after coding pass through LVDS chip
SN65MLVDS200 is converted to differential signal, send later using 540042 WE-MIDCOM NL1548 of network transformer isolation
Enter cable, is transmitted to inside next acquisition station.The power circuit of acquisition station is embedded into data acquisition board and FPGA master control borad, real
The power supply mode similar to PoE is showed, take electricity from the big line of transmission and has carried out a series of voltage conversion, has been data acquisition circuit plate
Stable DC source is provided with FPGA main control board.
Fig. 2-6 is the design schematic diagram that the high-precision degree of the present invention passes power circuit in formula seismic prospecting data collecting system,
Power circuit is the key that realize the low power consumption of Distributed seismic acquisition station.Distributed seismic acquisition station is according to FPGA governor circuit
With the power reguirements of chip each on data acquisition circuit, a series of micro energy lose voltage conversion circuits are devised.FPGA governor circuit
Digital voltage with data acquisition circuit is 3.3V, needs to design a 48V and turns+3.3V DC isolation power supply.Fpga chip is also
Need supply+1.2V（Or+1.1V）Core voltage and+2.5V configuration voltage, therefore devise+3.3V turn+1.2V（Or+
1.1V）With+2.5V circuit.In data acquisition circuit, the supply voltage of artificial circuit part is+2.5VA and -2.5VA ,+
2.5VA can be converted by+3.3V, and -2.5VA, which needs that+3.3V is first converted to -3.3V, is reconverted into -2.5VA.ADS1282 and
The chips such as DAC1282 need high-precision reference data voltage+VREF and-VREF, and voltage difference is 2.5V between the two.This
Outside, power ground is also divided in circuit, with being divided into common reference GND, digital power ground DGND and analog power
Ground AGND, three connect finally by magnetic bead and realize single-point altogether.
Fig. 7 is that the high-precision degree of the present invention passes pre-filtering and channel switching circuit original in formula seismic prospecting data collecting system
Reason figure.GEOH and GEOL connects hydrophone output positive and negative anodes respectively in figure.A pair of of BAV199 switching diode limits input voltage
Between -2.5V to+2.5V.Resistance R13, R14, R17, R18 and capacitor C13 constitute difference filter and remove from input signal
High frequency normal mode ingredient.Capacitor C12, C14 and resistance R14, R18 constitute common-mode filter, and high frequency is removed from input signal
Common mode component.Resistance R15, R16 set input signal intermediate bias level be ground level, while with the input terminal of ADS1282
Constitute bias current circuit.AOUT2+ and AOUT2- connects the analog input end of ADS1282.
Fig. 8 is that the high-precision degree of the present invention passes high-precision adc DAC1282 in formula seismic prospecting data collecting system
Circuit diagram.It is powered using bipolar power supply, and analog power is ± 2.5V, digital power 3.3V.Switch input
SWINP and SWINN is connect with the output end DACOUT+ and DACOUT- of DAC respectively, output end SWOUTP and SWOUTN respectively with
The input terminal GEOH of simulation front end circuit is connected with GEOL, therefore, can be achieved by control change-over switch switching from DAC output end
It is tested to the pulse of hydrophone input terminal, THD and common-mode rejection ratio.In addition, DACOUT+ and DACOUT- also with ADS1282
Two input channels connect, it can be achieved that from DAC output end to the lane testing of ADS1282 input terminal.The master clock of DAC1282 inputs
It for 4.096MHz, is generated by external active crystal oscillator, in order to synchronous with the clock of ADS1282, the two shares the same clock source.
FPGA configures DAC1282 by the SPI interface constituted with CS, SCLK, DIN, DOUT.
Fig. 9 is that the high-precision degree of the present invention passes fully integrated digital analog converter ADS1282 in formula seismic prospecting data collecting system
Circuit diagram.It is powered using bipolar power supply, and analog power is ± 2.5V, digital power 3.3V, external reference voltage
For+2.5V.Input clock is the 4.096MHz clock source shared with DAC1282.One AOUT1+ of Differential Input channel/- with
DAC1282 port difference DACOUT+/- connection, two AOUT2+ of Differential Input channel/- are connect with front end circuit output end.
FPGA controls ADS1282 by the SPI interface of SCLK, MISO, MOSI and DRDY composition.ADS1282 also provides external sync letter
Number input port SYNC and signal cross width mark delivery outlet MFLAG.
Figure 10 is that the high-precision degree of the present invention passes on-site programmable gate array FPGA master in formula seismic prospecting data collecting system
Control circuit structure block diagram.Governor circuit devises two LVDS receivers and two LVDS transmitters, realizes acquisition station and outside
The both-end sending and receiving data of equipment is transmitted.Due to having used the LVDS interface positioned at I/O block at the top and bottom of FPGA in design, it is only
Support emulation LVDS interface type.Therefore, collocation specific non-essential resistance net as shown in figure 11 is needed as the LVDS of transmitter
Network, RS resistance value is 170 Ω here, and RP resistance value is 120 Ω, and is needed as the LVDS of receiver one 100 in parallel in input terminal
The external build-out resistor of Ω.In addition, the influence in order to avoid other signals to LVDS, when design, is avoided where LVDS interface
Other GPIO resources are distributed in I/O block.
Figure 11 is that the high-precision degree of the present invention passes emulation LVDS transceiver circuit figure in formula seismic prospecting data collecting system.Number
According to stream after fpga chip is handled, portion carries out Manchester's code in the chip, and the data sent out after coding pass through LVDS core
Piece SN65MLVDS200 is converted to differential signal, after 540042 WE-MIDCOM NL1548 of network transformer isolation
It is sent into cable, is transmitted to inside next acquisition station.
Figure 12 is that the high-precision degree of the present invention passes LVDS interface isolation circuit in formula seismic prospecting data collecting system.FPGA's
LVDS transceiver signal and big line signal are by the progress isolation coupling of isolation circuit shown in this Figure 12, since earthquake-capturing station is
Both-end receives and dispatches transmission structure, it is therefore desirable to two network isolation transformers.Isolating transformer is using the production of Han Ren company
HR601680E, its primary coil connect the big line of four cores, can extract ± 24V power supply, secondary coil from centre cap CT, CMT
It connects LVDS and receives and dispatches differential pair, optional 1.2V bias voltage circuit is configured on secondary coil centre cap RCT, TCT,
For stablizing the transmission of LVDS signal.
The technical scheme adopted by the invention to solve the technical problem is that：Power circuit in data collection system is carried out
The design of low-power consumption；Data acquisition unit uses Texas Instrument（Texas Instruments）The high precision analogue of production turns
Parallel operation ADS1282 and fully integrated digital analog converter DAC1282 suitable for seismic test, since ADS1282 is integrated with simulation electricity
Sub switch, programmable amplifier and digital filter, therefore the complexity of circuit design is enormously simplified, while also reducing function
Consumption；Using based on FPGA Logical Design mode and PowerPC 405 seismic data is handled, improve data processing
Speed and precision.The hardware size of the data collection station circuit design is successfully reduced in hardware aspect, is reduced costs
And power consumption, remote transmission is then carried out by LVDS data transfer mode, so that data transmission will be acquired to PC host.The system
Have the characteristics that high-precision, low-power consumption, self-test, low cost, provides many conveniences for seafari, saved many manpowers
Material resources.
The working principle of the invention：System work when, main power source station to acquisition unit send comprising control command with it is synchronous
Collected data are packed into data frame packet in order and backward after resuming by the data frame packet of information, data acquisition unit
It send, power station carries out data processing and compress subsequent resume to give subsequent data acquisition unit after receiving data frame packet.
Main control computer carries out the records such as decoding decoding to data.Due to consideration that earthquake-capturing station inner space is extremely limited, therefore
Stacked design is used on hardware circuit, earthquake-capturing station is whole by data acquisition circuit plate and FPGA main control board
Group is combined into, and the I/O interface between them carries out vertical butt joint by 26 foot double-row needles of 2 2.54mm spacing.
Beneficial effects of the present invention：The invention has many advantages, such as high-precision, low-power consumption, low cost, portable, applicable Yu Haiyang
Seismic prospecting, the ADS1282 and core of the DAC1282 chip as acquisition station that data acquisition circuit is developed by TI company mention
The high resolution ratio and dynamic range of acquisition data；Logical Design mode based on FPGA, reduces the hard of circuit design
Part scale simultaneously passes through its correctness of experimental verification；The selection of the low power dissipation design of power module and ADS1282 chip in system, no
It reduced by only the usage quantity of battery, and reduce human and material resources and financial resources, also have enormous benefits to seafari work.
Claims (10)
- It is to carry out the seismic prospecting of earthquake data acquisition in ocean 1. a kind of high-precision degree passes formula seismic prospecting data collecting system Data collection system, it is characterised in that mainly include main control computer, acquisition unit, data packet and hydrophone and power supply；Wherein, Main control computer mainly completes the processing of seismic data, waveform is shown and stores；Acquisition unit mainly realize data acquisition, The data acquisition circuit of storage and communication function, acquisition unit using high-precision adc ADS1282 and is suitable for earthquake The fully integrated digital analog converter DAC1282 of test, on-site programmable gate array FPGA is the control axis at earthquake-capturing station；Water is listened Device is mainly used to sense seismic signal；Seismic wave information is to be acquired, amplified by the acquisition station of acquisition unit, filtered, so Digitized seismic signal is sent into afterwards in the central recording unit of main control computer and is recorded；When system works, main power source It stands and sends the data frame packet comprising control command and synchronizing information to acquisition unit, data acquisition unit presses collected data Sequence is packed into data frame packet and continues to transmit backward, and power station carries out data processing and pressure after receiving data frame packet Subsequent resume of contracting gives subsequent data acquisition unit.
- 2. system according to claim 1, it is characterised in that acquisition unit be based on high-precision adc ADS1282 with The data acquisition circuit of fully integrated digital analog converter DAC1282；Its major function is to receive on-site programmable gate array FPGA The I/O control logic and acquisition of governor circuit carry out analog-to-digital conversion to the electric signal of hydrophone response, obtained number letter It number sends FPGA master controller to and carries out operation and processing；In control of the on-site programmable gate array FPGA as earthquake-capturing station Pivot, major function is to send control instruction to data acquisition circuit and provide related chip pin control logic level, with setting Sample rate, sampling length needed for data acquisition, are arranged preamplification gain and switching working mode and input channel, while receiving, The data frame that analysis and forwarding are transmitted from power station.
- 3. system according to claim 1, it is characterised in that preposition amplification AMP, 24 Sigma-delta ADC's sum numbersWord filter is as part of data acquisition, and FPGA and LVDS transmission chip are as data processing and hop.
- 4. system according to claim 1, it is characterised in that use the Digital Logic based on on-site programmable gate array FPGA Design method and PowerPC405 handle seismic data.
- 5. system according to claim 1, it is characterised in that data packet is according to core each on governor circuit and data acquisition circuit A series of power reguirements of piece, using super low-power consumption voltage conversion circuits.
- 6. system according to claim 1, it is characterised in that believed using pre-filter circuit simulation in data acquisition unit Number carry out front-end processing, and using actual acquisition channel and DAC TCH test channel driving source switching circuit.
- 7. system according to claim 1, it is characterised in that the main control module of acquisition unit uses field-programmable gate array Column fpga chip 3C5T144C5N and PowerPC405.
- 8. system according to claim 1, it is characterised in that data transmission circuit is realized using emulation LVDS transceiver and synchronized Number passes.
- 9. system according to claim 8, it is characterised in that emulation LVDS transceiver is data flow by field programmable gate After the processing of array fpga chip, portion carries out Manchester's code in the chip, and the data sent out after coding are turned by LVDS chip It is changed to differential signal, cable is sent into after being isolated using network transformer, is transmitted to inside next acquisition station.
- 10. system according to claim 1, it is characterised in that the pre-filtering of acquisition unit and channel switching circuit are GEOHConnect hydrophone output positive and negative anodes respectively with GEOL；A pair of of BAV199 switching diode by input voltage be limited in -2.5V to+ Between 2.5V；Resistance R13, R14, R17, R18 and capacitor C13 constitute difference filter and remove high frequency normal mode from input signal Formula ingredient；Capacitor C12, C14 and resistance R14, R18 constitute common-mode filter, and high frequency common mode ingredient is removed from input signal；Electricity Resistance R15, R16 set the intermediate bias level of input signal as ground level, while the composition bias current with the input terminal of ADS1282 It returns；AOUT2+ and AOUT2- connects the analog input end of ADS1282.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810198754.0A CN108828671A (en) | 2018-03-12 | 2018-03-12 | High-precision degree passes formula seismic prospecting data collecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810198754.0A CN108828671A (en) | 2018-03-12 | 2018-03-12 | High-precision degree passes formula seismic prospecting data collecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108828671A true CN108828671A (en) | 2018-11-16 |
Family
ID=64154069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810198754.0A Pending CN108828671A (en) | 2018-03-12 | 2018-03-12 | High-precision degree passes formula seismic prospecting data collecting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108828671A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109597128A (en) * | 2018-12-27 | 2019-04-09 | 广州威拓电子科技有限公司 | Vertical-rise cable data acquisition control system and method |
| CN111323828A (en) * | 2020-04-02 | 2020-06-23 | 中国海洋大学 | Program-controlled gain type ocean electric field signal acquisition method, system, device and application |
| WO2021035896A1 (en) * | 2019-08-26 | 2021-03-04 | 自然资源部第一海洋研究所 | Marine seismic data acquisition control device |
| CN112484842A (en) * | 2020-11-03 | 2021-03-12 | 安徽节源环保科技有限公司 | Industrial equipment vibration data acquisition and transmission method |
| CN114647449A (en) * | 2020-12-17 | 2022-06-21 | 航天科工惯性技术有限公司 | Data processing method, device and system of terminal equipment |
| WO2023056989A1 (en) * | 2021-12-01 | 2023-04-13 | 中国石油大学(华东) | Three-dimensional ultrasonic seismic model real-time imaging system and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2809660Y (en) * | 2005-04-19 | 2006-08-23 | 中海油田服务股份有限公司 | Earthquake data acquisition board for geophysical exploration |
| CN101071176A (en) * | 2006-05-11 | 2007-11-14 | 维斯特恩格科地震控股有限公司 | Method and apparatus for marine seismic data acquisition |
| CN104181579A (en) * | 2014-08-12 | 2014-12-03 | 西南科技大学 | Full-digital three-component VSP (vertical seismic profile) system and measuring method thereof |
| CN104849761A (en) * | 2015-05-21 | 2015-08-19 | 中国科学院声学研究所 | Acoustic deep sea towing detection system |
| CN105425713A (en) * | 2015-11-02 | 2016-03-23 | 合肥国为电子有限公司 | Low-consumption control method suitable for geophysical exploration cross station |
| CN106199688A (en) * | 2016-06-29 | 2016-12-07 | 成都理工大学 | It is integrated with high accuracy three-component microseism cymoscope and the implementation method of actively focus |
-
2018
- 2018-03-12 CN CN201810198754.0A patent/CN108828671A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2809660Y (en) * | 2005-04-19 | 2006-08-23 | 中海油田服务股份有限公司 | Earthquake data acquisition board for geophysical exploration |
| CN101071176A (en) * | 2006-05-11 | 2007-11-14 | 维斯特恩格科地震控股有限公司 | Method and apparatus for marine seismic data acquisition |
| CN104181579A (en) * | 2014-08-12 | 2014-12-03 | 西南科技大学 | Full-digital three-component VSP (vertical seismic profile) system and measuring method thereof |
| CN104849761A (en) * | 2015-05-21 | 2015-08-19 | 中国科学院声学研究所 | Acoustic deep sea towing detection system |
| CN105425713A (en) * | 2015-11-02 | 2016-03-23 | 合肥国为电子有限公司 | Low-consumption control method suitable for geophysical exploration cross station |
| CN106199688A (en) * | 2016-06-29 | 2016-12-07 | 成都理工大学 | It is integrated with high accuracy three-component microseism cymoscope and the implementation method of actively focus |
Non-Patent Citations (2)
| Title |
|---|
| 李建良 等: ""差分式地震检波器测试仪的失真度测试研究"", 《自动化仪表》 * |
| 王京京 等: ""一种高精度地震数据采集单元的系统设计与实现"", 《地球物理学进展》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109597128A (en) * | 2018-12-27 | 2019-04-09 | 广州威拓电子科技有限公司 | Vertical-rise cable data acquisition control system and method |
| WO2021035896A1 (en) * | 2019-08-26 | 2021-03-04 | 自然资源部第一海洋研究所 | Marine seismic data acquisition control device |
| CN111323828A (en) * | 2020-04-02 | 2020-06-23 | 中国海洋大学 | Program-controlled gain type ocean electric field signal acquisition method, system, device and application |
| CN112484842A (en) * | 2020-11-03 | 2021-03-12 | 安徽节源环保科技有限公司 | Industrial equipment vibration data acquisition and transmission method |
| CN114647449A (en) * | 2020-12-17 | 2022-06-21 | 航天科工惯性技术有限公司 | Data processing method, device and system of terminal equipment |
| CN114647449B (en) * | 2020-12-17 | 2024-02-20 | 航天科工惯性技术有限公司 | Data processing method, device and system of terminal equipment |
| WO2023056989A1 (en) * | 2021-12-01 | 2023-04-13 | 中国石油大学(华东) | Three-dimensional ultrasonic seismic model real-time imaging system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108828671A (en) | High-precision degree passes formula seismic prospecting data collecting system | |
| CN206893080U (en) | It is a kind of based on the seismic signal acquiring system being wirelessly transferred | |
| CN104181579B (en) | Full-digital three-component VSP (vertical seismic profile) system and measuring method thereof | |
| CN102033149B (en) | Mixed signal acquisition system for a measurement instrument | |
| CN102843166B (en) | Device and method for underground long-distance transmission of Manchester code | |
| CN102628960B (en) | Velocity and acceleration two-parameter digital geophone | |
| CN104020490A (en) | Full-digital MEMS three-component geophone | |
| CN110080749A (en) | A kind of universal adaptive high speed logging remote transmission system | |
| CN102096111A (en) | Transmitting-receiving antenna separation type nuclear magnetic resonance water exploring device and water exploring method | |
| CN102183798A (en) | Measurement and control system of in-ocean towed multi-linear array acoustic positioning device | |
| CN205788714U (en) | A kind of 32 triple channel synchronous data collection devices with wireless self-networking function | |
| CN208872879U (en) | A kind of microseism data collection system | |
| CN103969537B (en) | Analog quantity, the transformer interference source test system and method for digital quantity mixing collection | |
| CN205562829U (en) | Real -time acquisition and storage and data become transition electromagnetic emission receipt all -in -one that picture was explained | |
| CN203673081U (en) | Underground full wave magnetic resonance sounding detection device based on wireless network | |
| CN102183571A (en) | Device for monitoring underground water seepage with excitation-at-the-mass method | |
| CN211426816U (en) | Low-power consumption wireless seismic data recording device | |
| CN106405628A (en) | Earth crust shock collection system | |
| CN205317861U (en) | Three -component transition electromagnetic surveying receiver | |
| CN103759807B (en) | A kind of airport noise monitoring device based on Internet of Things framework | |
| CN206741692U (en) | The energy data extraction element of electric energy meter | |
| CN208257796U (en) | Mine-used I. S signal receiving device | |
| CN103278853B (en) | A kind of Single-channel ground electric-field instrument | |
| CN106487341A (en) | A kind of high anti-interference preamplifier | |
| CN206594490U (en) | High-precision analog signal isolation conversion output system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181116 |
|
| RJ01 | Rejection of invention patent application after publication |