CN106656110B - A kind of signal simulator for multifunction electromagnetic method receiver test - Google Patents
A kind of signal simulator for multifunction electromagnetic method receiver test Download PDFInfo
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- CN106656110B CN106656110B CN201611128901.4A CN201611128901A CN106656110B CN 106656110 B CN106656110 B CN 106656110B CN 201611128901 A CN201611128901 A CN 201611128901A CN 106656110 B CN106656110 B CN 106656110B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/01—Shaping pulses
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Abstract
The invention discloses a kind of signal simulators for multifunction electromagnetic method receiver test, including signal simulator circuit, the signal simulator circuit by GPS module, microcontroller, rotary switch, digital compensation crystal oscillator MCXO, on-site programmable gate array FPGA, chopper circuit, shaping circuit, gating switch, power circuit and lithium battery group at；Simulator of the present invention can carry out 6 kinds of standard signal outputs of MT, AMT, CSAMT, SIP, TDIP and TDEM, have the advantages that multi-functional, automatic cycle frequency sweep, precise synchronization, portable, low-power consumption and easy to use, provides scheme for the interior and field condition self-checking of multifunction electromagnetic receiver.
Description
Technical field
The present invention relates to the electromagnetic method instrument, exploitations in geophysical instrument, in multifunction electromagnetic receiver cabin and wild
Outer scene self-checking uses, specifically, be a kind of signal simulator for multifunction electromagnetic method receiver test, it can be defeated
A variety of specific waveforms out.
Background technique
Electromagnetic method (or being electromagnetic induction method) is the important branch of electrical prospecting.This method mainly utilizes the conduction of rock and ore
Property, magnetic conductivity and dielectricity difference, using electromagnetic induction principle, observation and research is artificial or point of electromagnetic field that naturally occurs
Cloth rule (frequency characteristic and time response), and then solve related all kinds of geological problems.
Electromagnetic method is that a kind of method of engineering mineral exploration is carried out using the electromagnetic wave of artificial source or natural field source, belongs to object
Electromagnetic method in reason exploration, there are commonly magnetotelluric methods (MT), audio-frequency magnetotelluric magnetic method (AMT), controllable source magnetotelluric method
(CSAMT), the methods of spectrum induced polarization method (SIP), time domain IP (TDIP) and transient electromagnetic method (TDEM)
In the exploitation of multifunction electromagnetic receiver and use process, indoor and field self-checking is necessary link, more
The field measurement of the methods of MT, AMT, CSAMT, SIP, TDIP and TDEM may be implemented in function electro-magnetic receiver.
MT method requires that the independent white noise of two-way occurs, and signal frequency covers 0.1mHz-1000Hz, amplitude 10mVp；
AMT method is similar with MT method, is independent binary channels white noise, frequency coverage 0.01Hz-100kHz；CSAMT
Method requires the output of square wave frequency sweep, carries out frequency sweep output according to specific frequency meter, to output waveform time with higher essence
Degree, emits 41 groups of frequencies, and frequency coverage 0.1Hz-10kHz recycles frequency sweep duration 50min；SIP method and CSAMT
Method is similar, cycles through 12 frequency points, and frequency range 1/64Hz-128Hz recycles frequency sweep duration 15min；TDIP method
It is required that output, which just stops to bear, stops signal, pulsewidth 2s, duty ratio 1:1 default polarizability 5%, amplitude 10mVp；TDEM method is similar
TDIP signal, amplitude 1Vp more demanding to the turn-off time.
Various methods require signal output totally different above, are embodied in amplitude, frequency, waveform, the time synchronization, choosing of signal
It selects on channel, however existing general purpose function signal generator is only capable of providing the sine of wideband, square wave, triangle, modulating wave or can compile
Any wave collected is difficult to meet test request in terms of port number, time synchronization, automatic switchover.
Existing white noise signal generator bandwidth is limited, is not able to satisfy wideband MT measurement request.To carry out receiver
Indoor and field uniformity test, needs individually to develop corresponding multifunctional signal simulator.
Summary of the invention
In order to overcome the shortcomings of existing general purpose function signal generator, the present invention proposes that a kind of multifunction electromagnetic method that is used for connects
The signal simulator of receipts machine test, the simulator can carry out 6 kinds of standard letters of MT, AMT, CSAMT, SIP, TDIP and TDEM
Number output, has the advantages that multi-functional, automatic cycle frequency sweep, precise synchronization, portable, low-power consumption and easy to use, is
The interior of multifunction electromagnetic receiver and field condition self-checking provide scheme.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of signal simulator for multifunction electromagnetic method receiver test of the present invention, including signal simulator electricity
Road, the signal simulator circuit can be compiled by GPS module, microcontroller, rotary switch, digital compensation crystal oscillator MCXO, scene
Journey gate array FPGA, chopper circuit, shaping circuit, gating switch, power circuit and lithium battery group at；Power circuit is connected with lithium
Battery provides power supply for signal simulator circuit；GPS is respectively connected to MCU and FPGA, and MCU and FPGA are interconnected, MCU connection rotation
Button switch, FPGA connection MCXO, chopper circuit, shaping circuit and gating switch, chopper circuit and shaping circuit are separately connected choosing
Pass is opened up, circuit signal output is carried out by gating switch.
GPS provides temporal information and PPS pulse per second (PPS) for circuit；MCU identifies the model selection of rotary switch input, according to mould
Formula selection generates the clock signal of response with FPGA cooperation；FPGA carries out clock signal frequency dividing under the control of MCU, frequency is closed
At, PPS triggering；MCXO provides system clock for FPGA；FPGA clock signal is converted to positive and negative square wave by chopper circuit, be MT,
AMT, SIP or CSAMT prepare, and are required to carry out amplitude fading and limit band according to method；TDIP and TDEM method signal is shaped
Circuit output is just stopped to bear and stops waveform；Gating switch requires to export the signal of chopper circuit or shaping circuit according to method
It is connected to Ex, Ey, Ez, Hx, Hy, Hz component.
Chopper circuit is made of reference voltage source, single track single-throw switch K1 and amplifier U2；Front end U1 is benchmark voltage source, Gu
Surely 2.5V benchmark is exported；Single-pole single-throw switch (SPST) is controlled by clock signal SW, and when SW is high, K1 closure, when SW is low, K1 is opened
Road；Amplifier U2 be TI production OPA2378, with zero shift, low noise, low-power consumption feature；
When input control signal SW is height, K1 closure, it is zero that the 3rd pin of U2, which is voltage, and the 2nd pin is also zero, output 1
Pin is -2.5V；When input control signal SW be it is low, K1 open circuit, the 3rd pin and the 2nd pin are+2.5V, output 1 pin be
+2.5V；U2B is attenuator circuit, and the square wave of ± 2.5V is decayed to the square wave of ± 10mV, and limiting band is 100kHz.
Shaping circuit input is CLKA, CLKB, and wherein CLKA is the square-wave signal of 1:3 duty ratio, divides to obtain through FPGA,
Pulsewidth 2s, CLKB are the square-wave signal of 1:1 duty ratio, pulsewidth 2s；U3A carries out copped wave and reversed ratio enlargement, output to CLKA
SA is the square-wave pulse signal of peak value -2.5V, and U3B carries out copped wave and reversed ratio enlargement to CLKB, and output SB is peak value -2.5V
Square-wave signal；SA obtains the square-wave pulse signal SC of 5Vp through the reversed ratio enlargement of U4A；SC and SB carries out add operation through U4B
The negative echo signal for stopping just stopping is obtained, amplitude is that ± 2.5V, U5A and U5B carry out limit band, and bandwidth is set as 10kHz, wherein
The output of Vout_TDEM amplitude is ± 1Vpp, and Vout_TDIP output is ± 10mVpp.
When being set as MT operating mode, FPGA setting generates the independent pseudo-random sequence of two-way, and pseudo-random signal symbol is wide
Degree is 1ms, length 16M, and two paths of signals obtains ± 10mVpp square-wave signal via chopper circuit, and Ex, Hy are by wherein sequence all the way
Column generate, and Ey, Hx are generated by another way sequence, and analog switch is set as gating chopper circuit output.
When being set as AMT operating mode, it is different from MT mode, symbol width is set as 10us, other are consistent；
When being set as CSAMT mode, MCU reads GPS time information, and the hair of current point in time is calculated according to the frequency meter time
Radio frequency rate, control of the FPGA in MCU carry out specific frequency point output.After some frequency point is sent, MCU successively carries out subsequent frequency point
Square wave output.Square wave output is exported via chopper circuit；It exports to Ex, Ey, Hx, Hy, Hz；
When being set as SIP output, it being different from CSAMT mode, frequency meter is switched to specific SIP frequency meter, output to Ex,
Ey,Ez；Other are consistent.
When being set as TDIP mode, MCU controls FPGA according to temporal information, and it is respectively 1 that frequency dividing, which obtains 2s pulse duty cycle:
The clock signal of 1 and 1:3；Even minutes pulse signal PPM is obtained according to PPS and temporal information, rising edge clock is synchronous with PPM
Alignment, two-way clock shaping circuit are exported to three electric fields；It exports to Ex, Ey, Ez；
When being set as TDEM mode, TDIP mode is distinguished, signal amplitude is set as ± 1Vpp, other are consistent.
The present invention generates the independent pseudo-random sequence of two-way by FPGA under the control of MCU, obtains after chopped circuit white
Noise sequence realizes the output of AMT, MT signal；The time service with FPGA and GPS module, generates the square wave of specific frequency, in MCU
Control under realize automatic cycle frequency sweep output, realize CSAMT, SIP signal output；FPGA is controlled according to temporal information by MCU
Triggering generates the square wave of 2s pulsewidth, and shaped circuit, which generates, just stops the negative TDIP and TDEM waveform stopped.Each waveform is by gating switch
Output is into corresponding channel.
Thus, simulator of the present invention can carry out 6 kinds of standard signal outputs of MT, AMT, CSAMT, SIP, TDIP and TDEM,
Have the advantages that multi-functional, automatic cycle frequency sweep, precise synchronization, portable, low-power consumption and easy to use, is multi-functional electricity
The interior of magnetic receiver and field condition self-checking provide scheme.
Detailed description of the invention
Fig. 1 is signal simulator circuit block diagram of the present invention.
Fig. 2 is chopper circuit schematic diagram of the invention.
Fig. 3 is shaping circuit diagram of the invention.
Specific embodiment
As shown in Figure 1, a kind of signal simulator for multifunction electromagnetic method receiver test of the present invention, including signal
Simulator circuit, signal simulator circuit is by GPS module, microcontroller, rotary switch, MCXO, FPGA, chopper circuit, whole
Shape circuit, gating switch, power circuit, external lithium battery group at.
Power circuit is connected with lithium battery and provides power supply for signal simulator circuit；GPS is respectively connected to MCU and FPGA, MCU
It is interconnected with FPGA, MCU connection rotary switch, FPGA connection MCXO, chopper circuit, shaping circuit and gating switch, copped wave
Circuit and shaping circuit are separately connected gating switch, carry out circuit signal output by gating switch.
Wherein GPS provides temporal information and PPS pulse per second (PPS), model Ublox-6T module for circuit；MCU identification knob is opened
The model selection for closing input, the clock signal of response is generated according to model selection and FPGA cooperation, and MCU selects TI MSP430 system
Column single-chip microcontroller；FPGA is the MAX10 Series FPGA product of Altera, clock signal frequency dividing is carried out under the control of MCU, frequency is closed
At, PPS triggering；MCXO digital compensation crystal oscillator provides system clock, clock frequency 12.288MHz for FPGA, and frequency stability is
±10ppb；FPGA clock signal is converted to positive and negative square wave by chopper circuit, is prepared for MT, AMT, SIP, CSAMT, and according to side
Method requires to carry out the amplitude fading of special ratios and limit band；TDIP and the shaped circuit output of TDEM method signal, are just stopped
It is negative to stop waveform；Gating switch according to method require by the signal of chopper circuit or shaping circuit output be connected to Ex, Ey, Ez, Hx,
Hy, Hz component.
As shown in Fig. 2, chopper circuit is made of reference voltage source, single track single-throw switch and amplifier.It is electric on the basis of the U1 of front end
Potential source, fixed output 2.5V benchmark, for the LT1019-2.5 of Linear company production, with high-precision, low-power consumption, Low Drift Temperature
Feature；Single-pole single-throw switch (SPST) is controlled by clock signal SW, when SW is high, K1 closure, and when SW is low, K1 open circuit；Amplifier U2
For TI production OPA2378, have zero shift, low noise,
When input control signal SW is height, K1 closure, it is zero that the 3rd pin of U2, which is voltage, and the 2nd pin is also zero, output 1
Pin is -2.5V；When input control signal SW be it is low, K1 open circuit, the 3rd pin and the 2nd pin are+2.5V, output 1 pin be
+2.5V；U2B is attenuator circuit, and the square wave of ± 2.5Vpp is decayed to the square wave of ± 10mVpp, and limiting band is 100kHz.
As shown in figure 3, shaping circuit input is CLKA, CLKB, wherein CLKA is the square-wave signal of 1:3 duty ratio, warp
FPGA divides to obtain, and pulsewidth 2s, CLKB are the square-wave signal of 1:1 duty ratio, pulsewidth 2s；U3A carries out copped wave and reversed to CLKA
Ratio enlargement, the square-wave pulse signal that output SA is peak value -2.5V, U3B carry out copped wave and reversed ratio enlargement, output to CLKB
SB is the square-wave signal of peak value -2.5V；SA obtains the square-wave pulse signal SC of 5Vp through the reversed ratio enlargement of U4A；SC and SB is passed through
U4B carries out add operation and obtains the negative echo signal for stopping just stopping, and amplitude is that ± 2.5V, U5A and U5B carry out limit band, bandwidth setting
For 10kHz, wherein the output of Vout_TDEM amplitude is ± 2Vpp, and Vout_TDIP output is ± 20mVpp.
When being set as MT operating mode, FPGA setting generates the independent pseudo-random sequence of two-way, and pseudo-random signal symbol is wide
Degree is 1ms, length 16M, and two paths of signals obtains 10mVpp square-wave signal via chopper circuit, and Ex, Hy are by wherein sequence all the way
It generates, Ey, Hx are generated by another way sequence, and analog switch is set as gating chopper circuit output.
When being set as AMT operating mode, it is different from MT mode, symbol width is set as 10us, other are consistent；
When being set as CSAMT mode, MCU reads GPS time information, and the hair of current point in time is calculated according to the frequency meter time
Radio frequency rate, control of the FPGA in MCU carry out specific frequency point output.After some frequency point is sent, MCU successively carries out subsequent frequency point
Square wave output.Square wave output is exported via chopper circuit；It exports to Ex, Ey, Hx, Hy, Hz；
When being set as SIP output, it being different from CSAMT mode, frequency meter is switched to specific SIP frequency meter, output to Ex,
Ey,Ez；Other are consistent.
When being set as TDIP mode, MCU controls FPGA according to temporal information, and it is respectively 1 that frequency dividing, which obtains 2s pulse duty cycle:
The clock signal of 1 and 1:3.Even minutes pulse signal PPM is obtained according to PPS and temporal information, rising edge clock is synchronous with PPM
Alignment, two-way clock shaping circuit are exported to three electric fields；It exports to Ex, Ey, Ez；
When being set as TDEM mode, TDIP mode is distinguished, signal amplitude is set as ± 1V, other are consistent；
The present invention is used for the signal simulator major parameter of multifunction electromagnetic method receiver test:
It is multi-functional: MT, AMT, CSAMT, SIP, TDIP, TDEM；
Output channel: 6 (Ex, Ey, Ez, Hx, Hy, Hz)；
Synchronization accuracy: it is better than 10us；
Output signal parameter:
MT: pseudorandom, frequency band: 0.1mHz-1000Hz, amplitude 10mVp；
AMT: pseudorandom, frequency band: 0.01Hz-100kHz, amplitude 10mVp；
CSAMT: square wave, 41 frequency points, 50min frequency meter circulation, amplitude 10mVp；
SIP: square wave, 12 frequency points, 15min frequency meter circulation, amplitude 10mVp；
TDIP: just stop it is negative stop, pulsewidth 2s, amplitude 10mVp, preset polarization rate 5%；
TDEM: just stop it is negative stop, pulsewidth 2s, amplitude 1Vp
Power consumption: less than 100mW (is free of GPS module)
Primary interface: rotary switch, magnetic track output, electric road output, lithium battery charge port, LED indication, GPS antenna.
Operating method: the signal simulator that the present invention is used for multifunction electromagnetic method receiver test GPS letter has been placed in
Number region, output end accesses in multifunction electromagnetic receiver, and different modes, signal are selected according to receiver test demand
Simulator exports corresponding waveform, LED indication working condition automatically.Note: it is supported under MT, AMT mode without GPS signal.
Finally, it should be noted that obviously, the above embodiment is merely an example for clearly illustrating the present invention, and simultaneously
The non-restriction to embodiment.For those of ordinary skill in the art, it can also do on the basis of the above description
Other various forms of variations or variation out.There is no necessity and possibility to exhaust all the enbodiments.And thus drawn
The obvious changes or variations that Shen goes out are still in the protection scope of this invention.
Claims (2)
1. a kind of signal simulator for multifunction electromagnetic method receiver test, including signal simulator circuit, feature
Be: the signal simulator circuit can by GPS module, microcontroller, rotary switch, digital compensation crystal oscillator MCXO, scene
Program gate array FPGA, chopper circuit, shaping circuit, gating switch, power circuit and lithium battery group at；Power circuit is connected with
Lithium battery provides power supply for signal simulator circuit；GPS is respectively connected to MCU and FPGA, and MCU and FPGA are interconnected, MCU connection
Rotary switch, FPGA connection MCXO, chopper circuit, shaping circuit and gating switch, chopper circuit and shaping circuit are separately connected
Gating switch carries out circuit signal output by gating switch；
GPS provides temporal information and PPS pulse per second (PPS) for circuit；MCU identifies the model selection of rotary switch input, is selected according to mode
Select the clock signal for cooperating with FPGA and generating response；FPGA carries out clock signal frequency dividing, frequency synthesis, PPS under the control of MCU
Triggering；MCXO provides system clock for FPGA；FPGA clock signal is converted to positive and negative square wave by chopper circuit, is MT, AMT, SIP
Or CSAMT prepares, and is required to carry out amplitude fading and limit band according to method；The shaped circuit of TDIP and TDEM method signal is defeated
Out, just stopped to bear and stop waveform；Gating switch requires for the output of the signal of chopper circuit or shaping circuit to be connected to according to method
Ex, Ey, Ez, Hx, Hy, Hz component.
2. being used for the signal simulator of multifunction electromagnetic method receiver test as described in claim 1, it is characterised in that: cut
Wave circuit is made of reference voltage source, single track single-throw switch K1 and amplifier U2；Front end U1 is benchmark voltage source, fixed output 2.5V
Benchmark；Single-pole single-throw switch (SPST) is controlled by clock signal SW, when SW is high, K1 closure, and when SW is low, K1 open circuit；Amplifier U2
For TI production OPA2378, with zero shift, low noise, low-power consumption feature；
When input control signal SW is height, K1 closure, it is zero that the 3rd pin of U2, which is voltage, and the 2nd pin is also zero, exports 1 pin
For -2.5V；When input control signal SW be it is low, K1 open circuit, the 3rd pin and the 2nd pin are+2.5V, output 1 pin be+
2.5V；U2B is attenuator circuit, and the square wave of ± 2.5V is decayed to the square wave of ± 10mV, and limiting band is 100kHz.
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| CN105044781A (en) * | 2015-06-04 | 2015-11-11 | 成都理工大学 | System and method for generating synchronous transient electromagnetic signal source |
| CN105929210A (en) * | 2016-05-06 | 2016-09-07 | 中南大学 | Detection signal generation circuit and self-check system |
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| AUPR723201A0 (en) * | 2001-08-23 | 2001-09-13 | M.I.M. Exploration Pty. Ltd. | A data aquisition system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044781A (en) * | 2015-06-04 | 2015-11-11 | 成都理工大学 | System and method for generating synchronous transient electromagnetic signal source |
| CN105929210A (en) * | 2016-05-06 | 2016-09-07 | 中南大学 | Detection signal generation circuit and self-check system |
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| "大深度分布式电磁探测接收系统原理样机研究";张文秀;《中国优秀硕士学位论文全文数据库 信息科技辑》;20090815(第08期);1-10 |
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