CN105846914B - A kind of wireless magnetic induction through the earth communication device and communication means - Google Patents
A kind of wireless magnetic induction through the earth communication device and communication means Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
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- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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Abstract
The present invention relates to a kind of wireless magnetic induction through the earth communication device and communication means, full-duplex communication is realized using multigroup magnetic field generator and Magnetic Sensor, when there are the methods that multiple frequency transmission can be used during multiple R-T units, it can be with Proper Match emitter and the position of reception device, the intensity of the docking collection of letters number is ranked up, and superfluous signal extraction useful signal is filtered out using bandpass filter.
Description
Technical field
The present invention relates to wireless communication technology fields, are related to a kind of wireless magnetic induction through the earth communication device and communication means.
Background technology
The trunk of system in the entire mine communication of through the earth communication is the important step connected on well with underground, should in mine
First aid is the hinge for connecting stranded miner and rescue personnel in helping.Mine environment is complicated, and narrow space should not lay excessive cable,
Flexibility is high to a certain extent compared with wired communication system for wireless communication system, without excessive cable, can reduce because of cable
Communication failure probability caused by damage.Traditional ground through communication system is by the use of electromagnetic wave as carrier diffusion signal, due to electromagnetism
The interference that ripple is subject in the soil containing moisture is larger, and ground through communication system both domestic and external uses very low frequency, the side of ultralow frequency
Method improves communication distance.The reduction of working frequency is in underground usually not sufficient so that transmitting and reception antenna become large-sized
These antenna is arranged in enough space.
Magnetic induction (Magnetic Induction) communication technology has the advantage that：1) undergrounds such as soil, coal petrography, water signal
The magnetic conductivity of transmission medium and the magnetic conductivity of air are about the same, will not at any time with space and change, therefore channel stablize；2)
Signal by magnetic coupling to receiving terminal, therefore there is no multipath loss the problem of；3) transmitter and receiver uses small line
As antenna, size can change circle according to working environment, there is no antenna size it is excessive the problem of.But the decline in magnetic field
The problem of rate is fast compared with electromagnetic wave, therefore magnetic induction communicates is that the propagation distance of signal is short.
Magnetic Sensor is widely used in modern industry and electronic product measures electric current, position, side with induced field intensity
To etc. physical parameters.In the prior art, there are many different types of sensors for measuring magnetic field and other parameter, such as adopt
With Hall (Hall) element, anisotropic magnetoresistance (Anisotropic Magneto resistance, AMR) element or huge magnetic
Resistance (Giant Magneto resistance, GMR) element is the Magnetic Sensor of sensing element.TMR(Tunnel Magneto
Resistance) element is the novel magnetic power inhibition effect sensor for starting commercial Application in recent years, generally also uses magnetic tunnel-junction
(Magnetic Tunnel Junction, MTJ) carrys out acute pyogenic infection of finger tip TMR elements.What it was utilized is the tunnel magnetic of Researches for Magnetic Multilayer Films
Electricresistance effect senses magnetic field, than different in nature magneto-resistor (the Anisotropic Magneto for finding simultaneously practical application before
Resistance, AMR) electricity of element or giant magnetoresistance (Giant Magneto resistance, GMR) element with bigger
Resistive rate.TMR technologies are mainly used for the magnetic reading head, MRAM and all kinds of Magnetic Sensors of hard disc of computer.In recent years, TMR is opened
Begin, for current sensor, angular transducer etc., to show very tempting application prospect.
The content of the invention
For the problem that current mining through the earth communication device is thoroughly apart from short, communication channel is unstable, and the present invention proposes one
Mineral long reach wireless magnetic induction through the earth communication device and communication means of the kind based on magnetic induction technology, the ground through communication system energy
It is enough that the environment that narrow space, electromagnetic interference are big in mine is adapted under conditions of low-power consumption, realize stablize over long distances real-time voice,
The transmission of the signals such as control.
The present invention is achieved by the following technical solutions：A kind of wireless magnetic induction through the earth communication device, with signal transmission
Direction is sequentially set with transmitting terminal and receiving terminal, and transmitting terminal includes baseband signal processor I connected in sequence, binary difference split-phase
Position modulator, power amplifier I and ferrite magnetic field generator；Receiving terminal includes magnetic field sensor connected in sequence, power is put
Big device II, both noise cancellation filters, binary system differential phase demodulator and baseband signal processor II；Baseband signal processor I,
It receives from each sensor node signal, analog signal is converted into digital signal by way of quantization encoding of sampling, and it is whole
It closes digital signal and is convenient for subsequent processing, then carry out the coding of low data rate；Binary system differential phase demodulator believes base band
The characteristics of signal of number processor output is modulated, low to adapt to magnetic communication frequency, and frequency band is narrow；Power amplifier I, modulation
Signal afterwards carries out power amplification, to increase the distance thoroughly of magnetic signal, increases communication range；Ferrite magnetic field generator,
Amplified electric signal is converted to magnetic signal, and magnetic field signal carries information and transmits thoroughly；Magnetic field sensor receives magnetic field signal simultaneously
It is converted into electric signal；Useful signal in ultra-weak electronic signal caused by magnetic field sensor is amplified by power amplifier II；
Both noise cancellation filters filter out noise caused by earth magnetism in Magnetic Sensor received signal；Binary system differential phase demodulator
II, the signal for carrying information is become by demodulation beneficial to the baseband signal handled；Baseband signal processor II, useful signal is translated
Code is simultaneously sent to user；The ferrite magnetic field generator and magnetic field sensor form magnetic induction through the earth communication channel.
The ferrite magnetic field generator is by columnar ferrite core, and copper coil, electric current input and output side forms, described
The copper wire diameter of copper coil is 0.81mm, and the teflon insulation layer of 45 μ m-thicks is adhered in outside, and copper wire is counterclockwise
Be wrapped on ferrite core, coil be 200 circles, a diameter of 0.18m of entire ferrite magnetic field generator；The ferrite core
Material is MnZn synthetic material.The magnetic conductivity of the FERRITE CORE is 10000, reaches 10 at magnetic direction 1000m-10T's
Magnetic field intensity.
Copper coil inductance L and variable condenser C composition the LC resonance circuit of the ferrite magnetic field generator are as signal
Radiating circuit, inductance L, capacitance C parameters in radiating circuit are subject to the dielectric constant and spiral winding of ferrite core and soil
The influence of geometry, the copper coil uses multiturn circular coil, since the working frequency of device is relatively low, so without considering posting
Come into force should, including Kelvin effect, kindred effect, parasitic capacitance (may be happened at working frequency very high when).Coil
Inductance L there is nonlinear characteristic, copper coil inductance L changes with the magnetizing current in ferrite core and is changed, and capacitance isWherein, f is working frequency；According to Biot-Savart law Biot-Savart law, circular coil is produced
Magnetic induction intensity calculates formula：
Wherein, μ r ferrite magnetics conductance, μ 0 are the magnetic conductivity of soil media, and z is communication distance, and R is coil radius, and i is
Electric current in coil, N are coil turn.
When resonance occurs for circuit, coil current reaches maximum, and the change of magnetic field strength scope that at this moment coil generates is maximum,
Assuming that resonant frequency is 1kHz, LC=2.53 × 10-8When, L can be drawn as 46.4H for the fixed coil of the number of turn, in iron oxygen
In body magnetic field generator during working frequency 1kHz, required capacitance (C) is approximately 0.55nF.
The magnetic field sensor is by two magneto-resistor TMR, steady bias voltage Vbias, ground terminal GND and output terminal composition
Receiving circuit, two magneto-resistor TMR series connection, one end of circuit applies steady bias voltage Vbias, the other end is ground terminal
GND draws signal output part with output voltage signal V in the symmetrical centre of two magneto-resistor TMRout。
Magneto-resistor TMR sensor can detect 1 × 10-10The magnetic field of T intensity, under the action of same external magnetic field, a magnetic
Another resistance value can decrease while the resistance value increase of resistance, and a magneto-resistor can be made by applying the outfield of opposite direction
Another resistance value can increase therewith while resistance value reduces.Magneto-resistor TMR in the ideal case has been with the variation of outfield H
Beautiful linear relationship, while without magnetic hysteresis, in practical situations, the response curve of magneto-resistor is with outfield variation showing with hysteresis
As we term it magnetic hysteresis.The response curve of magneto-resistor be a circuit, usually as application magnetic resistance material magnetic hysteresis very
It is small, a perfect linearity curve can be regarded as in actual use.In the sensor field of practical application, set since magnetic senses
The defects of restriction of meter and material, this curve can be more curved.
The ferrite magnetic field generator and magnetic field sensor be correspondingly arranged respectively it is multiple, magnetic field generator set it is different
Frequency range is sent, and magnetic field sensor sets different filter parameters to carry out frequency dividing reception, realizes the multiple-input multiple-output of all standing
Wireless communication system.
The both noise cancellation filters include low-noise amplifier and bandpass filter.
A kind of wireless magnetic induction through the earth communication method, comprises the following steps：
1) original signal is handled by baseband signal processor I as input signal；
2) according to the resonance rule of LC radiating circuits, by the way of deferential phase modulation, input signal is loaded into just
On string ripple and carry out power amplification；
3) modulated electric signal is converted to magnetic field signal by ferrite magnetic field generator, is loaded into LC oscillation circuits,
Generate the magnetic field of pulsed；
4) magnetic field sensor utilizes the characteristics of magneto-resistor TMR is with change of magnetic field strength and high change rate, receives the magnetic of variation
Field signal is simultaneously converted to electric signal；
5) useful signal therein is amplified by the electric signal received through power amplifier II；
6) noise canceled filters filter removes Geomagnetic signal interference therein；
7) after extracting useful signal, source signal is restored by the demodulation of differential phase；
8) baseband signal processor II transfers signals to difference respectively acording to the requirement of user to source signal into row decoding
Equipment in.
Original signal includes the digital signal of analog signal and each sensor node from above and below ground personnel, simulation
Signal is converted to digital signal by baseband signal processor I by way of sampling, quantify, encode.Signal passes through differential phase
The mode of (2DPSK) modulation is loaded on the sine wave of 500kHz, and in order to improve the intensity of transmitting signal, the signal of modulation passes through
It is input to after power amplification in LC radiating circuits.
Include useful signal and earth magnetic field signal, ground in the magnetic field signal that the receiving terminal magnetic field sensor of signal is received
The magnetic field of ball is changed under different geographical coordinates with the frequency for being less than 1Hz from 20 to 80 μ T, so the magnetic field signal of transmitting can
To be separated by low-noise amplifier and bandpass filter from the magnetic field signal of reception.
In receiving terminal, 2DPSK demodulation is carried out by the signal of bandpass filter, one symbol interval of signal time delay and with original
Signal multiplication exports source signal by being sampled judgement after low-pass filter.
The present invention can utilize multigroup magnetic field generator and Magnetic Sensor to realize full-duplex communication, when there are multiple transmitting-receiving dresses
The method that multiple frequency transmission can be used when putting can dock the collection of letters number with Proper Match emitter and the position of reception device
Intensity be ranked up, using bandpass filter filter out superfluous signal extraction useful signal.
Description of the drawings
Fig. 1 is the wireless magnetic induction through the earth communication apparatus structure schematic diagram of the present invention；
Fig. 2 is the transmitting terminal of the present invention and receiving terminal circuit figure；
Fig. 3 is the ferrite magnetic field generator of the present invention and generated theoretical magnetic chart；
Fig. 4 is the mining wireless magnetic induction through the earth communication embodiment flow chart of the present invention；
In figure, 1. baseband signal processors I, 2. binary system differential phase demodulators, 3. power amplifiers I, 4. ferrites
Magnetic field generator, 5. magnetic field sensors, 6. power amplifiers II, 7. both noise cancellation filters, 8. binary system difference phase demodulations
Device, 9. baseband signal processors II.
Specific embodiment
Present invention design transmits underground voice signal and is arranged on the letter that each sensor is sent inside mine
Number, in the daily production and transport of coal, supervision and management or even emergency management and rescue work all play an important role.These sensors detect ore deposit
Well internal temperature, humidity, pernicious gas content, plant machinery working order etc., it is similary to detect miner position, vital sign
Deng.Supplement of this wireless through the earth communication as daily underground wire communication equally occurs in mine disaster, wire communication and electricity
Magnetic wave wireless communication uses when paralysing as emergency communication.
As shown in Figure 1, a kind of wireless magnetic induction through the earth communication device, with signal transmission direction be sequentially set with transmitting terminal and
Receiving terminal, transmitting terminal include baseband signal processor I 1 connected in sequence, binary system differential phase demodulator 2, power amplifier I
3 and ferrite magnetic field generator 4；Receiving terminal includes magnetic field sensor 5 connected in sequence, power amplifier II 6, noise and eliminates filter
Ripple device 7, binary system differential phase demodulator 8 and baseband signal processor II 9；Baseband signal processor I 1 is received from each biography
Analog signal is converted into digital signal by sensor node signal by way of quantization encoding of sampling, and integrates digital signal just
In subsequent processing, the coding of low data rate is then carried out；Binary system differential phase demodulator 2, it is defeated to baseband signal processor
The characteristics of signal gone out is modulated, low to adapt to magnetic communication frequency, and frequency band is narrow；Power amplifier I 3, modulated signal
Power amplification is carried out, to increase the distance thoroughly of magnetic signal, increases communication range；Ferrite magnetic field generator 4, amplified
Electric signal is converted to magnetic signal, and magnetic field signal carries information and transmits thoroughly；Magnetic field sensor 5 receives magnetic field signal and is converted into
Electric signal；Useful signal in ultra-weak electronic signal caused by magnetic field sensor is amplified by power amplifier II 6；Noise
Wave filter 7 is eliminated, filters out noise caused by earth magnetism in Magnetic Sensor received signal；Binary system differential phase demodulator II 8,
The signal for carrying information is become by demodulation beneficial to the baseband signal handled；Baseband signal processor II 9, useful signal is decoded
And it is sent to user；The ferrite magnetic field generator 4 and magnetic field sensor 5 form magnetic induction through the earth communication channel.
Such as Fig. 2, shown in 3, since ferrite magnetic field generator 4 and magnetic field sensor 5 all have the feature of micromation, so
Transmitting and receiving device all has portability, and in underground coal mine, miner can carry.So if when disaster occurs suddenly
Also the unimpeded of communication is can guarantee, so as to improve emergency management and rescue efficiency.
Number of the input signal mainly by the voice analog signal from personnel in the pit and from each sensor node is believed
Number, analog-digital converter uses the ADS5203 chips of TI companies, each tunnels analogy of double 10 ADS5203 to digital sample
Rate is 40Msps, and all numeral inputs and output are 3.3V, compatible TTL and CMOS.
Baseband signal processor I, II 1,9 and binary system deferential phase modulation, demodulator 2,8 are by programmable gate array
(FPGA) core board and its peripheral circuits realize that fpga chip selects Xilinx companies
FPGA realizes software wireless Electricity Functional using FPGA, baseband signal is encoded, then according to deferential phase modulation (DPSK)
Method the frequency range of signal modulation to 500kHz.
Power amplifier I, II 3,6 is that a ultra-low noise, high-performance difference are put using ADI company AD8139, AD8139
Big device provides rail-to-rail output.It has low noise, high SFDR and wide bandwidth characteristic.
The effect of ferrite magnetic field generator 4 is that modulated electric signal is converted to magnetic field signal in Fig. 3, by cylindric
Ferrite core, copper coil, electric current input and output side composition, the copper wire diameter of the copper coil is 0.81mm, and outside is adhered to
The teflon insulation layer of 45 μ m-thicks, copper wire are wrapped on ferrite core counterclockwise, coil be 200 circles, entire iron
A diameter of 0.18m of oxysome magnetic field generator；The material of the ferrite core is MnZn synthetic material.The FERRITE CORE
Magnetic conductivity is 10000, reaches 10 at magnetic direction 1000m-10The magnetic field intensity of T, to the magnetic induction intensity at receiving terminal place
There is humidification.
Magnetic field sensor 5 uses tunnel magneto resistance TMR, has the resistance change rate of bigger compared with other Magnetic Sensors,
Better temperature stability, higher sensitivity, lower power consumption, the better linearity.Bridge-type TMR resistive arrangements, which improve, to be connect
Sensitivity is received, changing magnetic field signal is converted into electric signal.
Magnetic field sensor 5 can chip, mainly including power module, waveform preprocessing module and protection module.
The signal received needs to remove interference caused by earth magnetic field, according to Geomagnetic signal in different geographical coordinates
Under, be less than the frequency of 1Hz from 20 to 80 μ T change the characteristics of, filtered out using low-noise filter.
The both noise cancellation filters 7 use MAX275 modules, are made of noise amplifier and bandpass filter, MAX275
It is the integrated active filter of simulation of a continuous time that MAXIM companies release, hardware is by 4 operational amplifiers and several in piece
Resistance capacitance forms.The effect of bandpass filter is realized by the outer connecting resistance of different combinations.After extracting useful signal,
Amplification is first passed through, then one symbol interval of signal time delay and being multiplied with original signal is sentenced by being sampled after low-pass filter
Certainly, former base band signal is exported.The demodulation and decoding of signal are realized by fpga core system and its peripheral circuits, is distributed to simultaneously
Multichannel user, and transfer signals to respectively in different equipment acording to the requirement of user.
Fig. 4 is mining wireless magnetic induction through the earth communication module flow diagram proposed by the present invention, by taking voice signal as an example, bag
It includes：
1) phonetic entry, down-hole miner are carried out AD sample conversions and are believed for number by microphone apparatus input speech signal
Number；
2) signal processing, baseband signal processor I receives the voice signal after sampling, by being passed after Low-ratespeech coding
It is defeated to be modulated to binary system differential phase demodulator, frequency band narrow the characteristics of low to adapt to magnetic communication frequency, power amplifier I
It is that modulated signal is carried out power amplification under mine safety voltage, to increase the distance thoroughly of magnetic signal, increase communication
Scope；
3) magnetic signal emits, and amplified electric signal is converted to magnetic signal, magnetic by ferrite magnetic field generator using coil
Field signal carries information and transmits thoroughly；
4) magnetic signal receives, and magnetic field sensor receives magnetic field signal and is converted into electric signal on well, produced by Magnetic Sensor
Electric signal be small-signal, it is necessary to power amplifier is amplified useful signal, both noise cancellation filters filter out magnetic sensing
Noise caused by earth magnetism in device received signal；
5) signal processing, the signal for carrying voice messaging are transformed to be suitble to Base-Band Processing by binary system difference phase demodulation
Signal, into row decoding and be output to digital analog converter using baseband signal processor II,
6) voice signal exports, voice signal output module, by transmitting voice signal into loud speaker, realizes underground
The voice communication of staff.
Claims (9)
1. a kind of wireless magnetic induction through the earth communication device, transmitting terminal and receiving terminal are sequentially set with signal transmission direction, special
Sign is that transmitting terminal includes baseband signal processor I connected in sequence, binary system differential phase demodulator, I and of power amplifier
Ferrite magnetic field generator；Receiving terminal include magnetic field sensor connected in sequence, power amplifier II, both noise cancellation filters,
Binary system differential phase demodulator and baseband signal processor II；Baseband signal processor I is received and believed from each sensor node
Number, analog signal is converted into digital signal by way of quantization encoding of sampling, and integrate digital signal and be convenient for subsequent processing,
Then the coding of low data rate is carried out；Binary system differential phase demodulator carries out the signal of baseband signal processor output
Modulation, frequency band narrow the characteristics of low to adapt to magnetic communication frequency；Modulated signal is carried out power amplification by power amplifier I,
To increase the distance thoroughly of magnetic signal, increase communication range；Amplified electric signal is converted to magnetic by ferrite magnetic field generator
Signal, magnetic field signal carry information and transmit thoroughly；Magnetic field sensor receives magnetic field signal and is converted into electric signal；Power amplification
Useful signal in ultra-weak electronic signal caused by magnetic field sensor is amplified by device II；Both noise cancellation filters filter out magnetic
Noise caused by earth magnetism in sensor received signal；Binary system differential phase demodulator II, the signal for carrying information passes through
Demodulation becomes the baseband signal beneficial to processing；Useful signal is decoded and is sent to user by baseband signal processor II；The iron
Oxysome magnetic field generator and magnetic field sensor form magnetic induction through the earth communication channel；The communication means of the device includes following step
Suddenly：
1) original signal is handled by baseband signal processor I as input signal；
2) according to the resonance rule of LC radiating circuits, by the way of deferential phase modulation, input signal is loaded into sine wave
It goes up and carries out power amplification；
3) modulated electric signal is converted to magnetic field signal by ferrite magnetic field generator, is loaded into LC oscillation circuits, is generated
The magnetic field of pulsed；
4) magnetic field sensor utilizes the characteristics of magneto-resistor TMR is with change of magnetic field strength and high change rate, receives changing magnetic field letter
Number and be converted to electric signal；
5) useful signal therein is amplified by the electric signal received through power amplifier II；
6) noise canceled filters filter removes Geomagnetic signal interference therein；
7) after extracting useful signal, source signal is restored by the demodulation of differential phase；
8) baseband signal processor II transfers signals to different set respectively acording to the requirement of user to source signal into row decoding
In standby.
2. a kind of wireless magnetic induction through the earth communication device according to claim 1, which is characterized in that ferrite magnetic field occurs
Device is made of columnar ferrite core, copper coil, electric current input and output side, and the copper wire diameter of the copper coil is 0.81mm,
The teflon insulation layer of 45 μ m-thicks of outside attachment, copper wire are wrapped on ferrite core counterclockwise, coil 200
Circle, a diameter of 0.18m of entire ferrite magnetic field generator；The material of the ferrite core is MnZn synthetic material.
A kind of 3. wireless magnetic induction through the earth communication device according to claim 2, which is characterized in that the magnetic of FERRITE CORE
Conductance is 10000, reaches 10 at magnetic direction 1000m-10The magnetic field intensity of T.
4. a kind of wireless magnetic induction through the earth communication device according to claim 2, which is characterized in that ferrite magnetic field occurs
Copper coil inductance L and variable condenser C composition the LC resonance circuit of device as signal transmission circuit, inductance L in radiating circuit,
Capacitance C parameters are influenced be subject to the geometry of the dielectric constant and spiral winding of ferrite core and soil, the inductance L tools of coil
There is nonlinear characteristic, copper coil inductance L changes with the magnetizing current in ferrite core and changed, and capacitance is
Wherein, f is working frequency；According to Biot-Savart law Biot-Savart law, the produced magnetic induction intensity of circular coil
Calculation formula is：
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<mi>&mu;</mi>
<mi>r</mi>
</msub>
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<mi>&mu;</mi>
<mn>0</mn>
</msub>
<msup>
<mi>R</mi>
<mn>2</mn>
</msup>
<mi>N</mi>
<mi>i</mi>
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<mn>2</mn>
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<mo>(</mo>
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<mi>z</mi>
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<mi>R</mi>
<mn>2</mn>
</msup>
<mo>)</mo>
</mrow>
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<mn>3</mn>
<mo>/</mo>
<mn>2</mn>
</mrow>
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</mrow>
</mfrac>
</mrow>
Wherein, μ r ferrite magnetics conductance, μ 0 are the magnetic conductivity of soil media, and z is communication distance, and R is coil radius, and i is coil
In electric current, N is coil turn.
5. a kind of wireless magnetic induction through the earth communication device according to claim 1, which is characterized in that magnetic field sensor is by two
A magneto-resistor TMR, steady bias voltage Vbias, ground terminal GND and output terminal composition receiving circuit, two magneto-resistor TMR series connection,
One end of its circuit applies steady bias voltage Vbias, the other end is ground terminal GND, in the symmetrical centre of two magneto-resistor TMR
Signal output part is drawn with output voltage signal Vout。
6. a kind of wireless magnetic induction through the earth communication device according to claim 5, which is characterized in that magneto-resistor TMR is sensed
Device can detect 1 × 10-10The magnetic field of T intensity, under the action of same external magnetic field, while the resistance value increase of magneto-resistor
Another resistance value can decrease, and apply while the outfield of opposite direction can reduce the resistance value of magneto-resistor another
Resistance value can increase therewith.
A kind of 7. wireless magnetic induction through the earth communication device according to claim 1, which is characterized in that the ferrite magnetic field
Generator and magnetic field sensor are correspondingly arranged multiple respectively, and magnetic field generator sets different frequency range to be sent, magnetic field sensing
Device sets different filter parameters to carry out frequency dividing reception, realizes the multiple-input multiple-output wireless communication system of all standing.
A kind of 8. wireless magnetic induction through the earth communication device according to claim 1, which is characterized in that both noise cancellation filters
Including low-noise amplifier and bandpass filter.
9. a kind of wireless magnetic induction through the earth communication device according to claim 1, which is characterized in that original in step 1)
Signal includes the digital signal of analog signal and each sensor node from above and below ground personnel, and analog signal is believed by base band
Number processor I is converted to digital signal by way of quantization encoding of sampling.
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| CN107094031A (en) * | 2017-04-14 | 2017-08-25 | 中国矿业大学 | A kind of underground magnetic induction wireless communicator and method |
| CN108718208B (en) * | 2018-06-29 | 2024-04-09 | 河南中多科技发展有限公司 | D wave underground communication circuit |
| CN110926457B (en) * | 2019-11-08 | 2022-03-01 | 北京交通大学 | Noise reduction method of through-the-earth positioning signal based on frequency point amplitude acquisition |
| CN111030712B (en) * | 2019-11-27 | 2021-08-06 | 山东航天电子技术研究所 | Through-the-earth magnetic field communication device |
| CN113067605B (en) * | 2021-03-17 | 2022-03-15 | 苏州磁联信息科技有限公司 | Magnetic induction communication antenna for intelligent warehousing management |
| CN113225160B (en) * | 2021-03-30 | 2022-04-12 | 大勺科技(北京)有限公司 | Data sending method, data receiving method, device and system based on magnetic communication |
| CN113300784A (en) * | 2021-05-30 | 2021-08-24 | 中国交通信息科技集团有限公司 | Receiving device and method for through-the-earth communication |
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