CN112272153A - Magnetic communication modulation circuit based on underground wireless sensor network and modulation method thereof - Google Patents

Magnetic communication modulation circuit based on underground wireless sensor network and modulation method thereof Download PDF

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CN112272153A
CN112272153A CN202010910373.8A CN202010910373A CN112272153A CN 112272153 A CN112272153 A CN 112272153A CN 202010910373 A CN202010910373 A CN 202010910373A CN 112272153 A CN112272153 A CN 112272153A
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resistor
capacitor
pin
communication
signal
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孙锁东
李玉紫
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Nanjing Yuyi Communication Technology Co Ltd
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Nanjing Yuyi Communication Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • 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
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
    • 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
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers

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Abstract

The invention discloses a magnetic flux modulation circuit based on an underground wireless sensor network and a modulation method thereof, wherein the modulation method comprises the following steps: the wireless signal amplification module expands an input signal to complete conversion from an input signal to an output signal; the wireless signal transmitting module strengthens anti-interference aiming at the process of transmitting wireless signals; the induction control module completes the transmission process from input to output of the magnetic communication by managing the running state of the wireless signal transmitting module; the power frequency modulation module completes stable transmission of communication by changing the working frequency to make up for the requirement of communication distance; the communication fusion module performs fusion adjustment on the multipath dispersed signals; the invention makes up the requirement of communication distance by changing working frequency and antenna parameters, improves communication quality and provides a safe and stable transmission environment for the underground wireless sensor network circuit.

Description

Magnetic communication modulation circuit based on underground wireless sensor network and modulation method thereof
Technical Field
The invention relates to the technical field of noise detection, in particular to a magnetic flux communication modulation circuit based on an underground wireless sensor network and a modulation method thereof.
Background
The underground wireless sensor network has the advantages of good concealment, easiness in deployment, capability of transmitting data in real time, good confidentiality and high coverage density, can be used for soil environment monitoring, earthquake landslide prediction, volcanic activity monitoring and security monitoring, and the realization of communication in the underground wireless sensor network becomes a research target in the field of information communication.
At present, the communication technology of the wireless sensor network on the ground is continuously developed and perfected, the main transmission medium of the underground wireless sensor network is soil, and further the difficulties of low antenna efficiency and weak useful signals of receiving points are faced, so that the transmission quality of the underground wireless communication signals is poor, and the electromagnetic wave communication is applied to the underground wireless sensor network, so that the effective communication between the sensors can realize the useful transmission of the electromagnetic wave communication signals only when the communication distance is 0.5m when the frequency of 2.4GHz is selected, the underground burying depth is limited, and the influence of the communication distance and the burying depth on the error rate cannot be obtained through the operation of a system.
Disclosure of Invention
The purpose of the invention is as follows: a magnetic flux modulation circuit based on an underground wireless sensor network is provided to solve the problems.
The technical scheme is as follows: a magnetic communication modulation circuit based on an underground wireless sensor network comprises: the wireless signal processing device comprises a wireless signal amplification module, a wireless signal transmitting module, an induction control module, a power frequency modulation module and a communication fusion module;
the wireless signal amplification module is used for expanding the input signal, adjusting the conversion from the input signal to the output signal and expanding the signal transmission;
the wireless signal transmitting module is used for carrying out channel modulation on the received communication signals and transmitting the modulated signals;
the induction control module is used for finishing the transmission process from input to output of the magnetic communication by managing the running state of the wireless signal transmitting module;
the power frequency modulation module is used for finishing stable transmission of communication by changing the working frequency to make up for the requirement of communication distance;
and the communication fusion module is used for carrying out fusion adjustment on the multipath dispersed signals and ensuring the integrity of the output signals.
According to an aspect of the invention, the wireless signal amplification module comprises a resistor R9, a resistor R10, a variable resistor RV1, a band amplifier U1, a capacitor C10, a capacitor C11, a resistor R11, and a resistor R12, wherein a pin 1 of the band amplifier U1 is respectively connected with one end of a resistor R9 and a wireless signal input terminal IN +; the other end of the resistor R9 is respectively connected with one end of a resistor R10, a pin 5 of a band amplifier U1, one end of a resistor R11, one end of a resistor R12 and a voltage signal of-6V; the other end of the resistor R10 is respectively connected with a wireless signal output end IN-, a frequency band amplifier U1 pin 2; pin 8 of the band amplifier U1 is connected with a voltage signal + 6V; pin 7 of the band amplifier U1 is connected with one end of a capacitor C10; pin 6 of the band amplifier U1 is connected with one end of a capacitor C11; pin 9 of the band amplifier U1 is respectively connected with pin 1 and pin 3 of a variable resistor RV 1; pin 4 of the band amplifier U1 is connected with pin 2 of a variable resistor RV 1; the other end of the capacitor C10 is connected with the other end of the resistor R11; the other end of the capacitor C11 is connected with the other end of the resistor R12; the wireless signal amplification module expands an input signal, adjusts conversion from the input signal to an output signal, and expands signal transmission.
According to one aspect of the invention, the wireless signal transmitting module comprises a data encoder U2, a resistor R1, a capacitor C1, a capacitor C2, a resistor R2, a humidity-sensitive resistor SD and a transmitter S1, wherein the pin 1 of the data encoder U2 is connected with the other end of the resistor R11; the other end of a pin 4 resistor R12 of the data encoder U2 is connected; the pin 9 of the data encoder U2 is respectively connected with one end of a capacitor C1, one end of a capacitor C2, one end of a resistor R2 and a ground wire GND; the other end of the capacitor C1 is respectively connected with the other end of the capacitor C2 and a voltage signal + 6V; the other end of the resistor R2 is respectively connected with one end of the humidity-sensitive resistor SD and a pin 14 of a data encoder U2; the other end of the humidity sensitive resistor SD is connected with a voltage signal + 12V; the pin 18 of the data encoder U2 is respectively connected with a pin 2 of a transmitter S1 and a voltage signal + 12V; the pin 17 of the data encoder U2 is connected with pin 1 of the transmitter S1; the pin 3 of the emitter S1 is connected with a ground wire GND; the wireless signal transmitting module carries out channel modulation on the received communication signals and then transmits the modulated signals.
According to one aspect of the invention, the induction control module comprises a diode D3, a resistor R13, a capacitor C12, a capacitor C13, a capacitor C14, a resistor R14, an inductor L5, a triode Q1, a resistor R15, a capacitor C15 and a triode Q1, wherein the positive terminal of the diode D3 is respectively connected with one end of the capacitor C12, one end of the capacitor C14, one end of the inductor L5, the emitter terminal of the triode Q1, one end of the resistor R15, one end of the capacitor C15, a ground GND and a pin 13 of a data encoder U2; the negative end of the diode D3 is respectively connected with one end of a resistor R13, an emitter end of a triode Q2 and a voltage signal of + 12V; the other end of the resistor R13 is respectively connected with the other end of the capacitor C12, one end of the resistor R14, the collector terminal of the triode Q1, the base terminal of the triode Q2, the other end of the capacitor C15, the other end of the resistor R15 and the collector terminal of the triode Q2; the other end of the resistor R14 is respectively connected with one end of a capacitor C13 and the base end of a triode Q1; the other end of the capacitor C13 is connected with the other end of the capacitor C14 and the other end of the inductor L5 respectively; the induction control module completes the transmission process from input to output of the magnetic communication by managing the running state of the wireless signal transmitting module.
According to one aspect of the invention, the power frequency modulation module comprises a capacitor C3, a varactor D1, a capacitor C4, an electrothermal C5, a resistor R3, a resistor R4, a capacitor C7, a resistor R5, a transistor Q3, a capacitor C6 and a turn number conversion LK, wherein one end of the capacitor C3 is respectively connected with a positive terminal of the capacitor C4, a turn number conversion LK pin 2 and a positive terminal of the capacitor C5; the other end of the capacitor C3 is respectively connected with the negative electrode end of the variable capacitance diode D1 and one end of the resistor R4; the positive end of the variable capacitance diode D1 is respectively connected with the negative end of a capacitor C4, the turn number conversion LK pin 4, the pin 3, the negative end of a capacitor C7 and the ground wire GND; the positive end of the capacitor C7 is respectively connected with one end of the resistor R5 and the other end of the resistor R4; the other end of the resistor R5 is connected with a voltage signal + 6V; the negative electrode end of the capacitor C5 is respectively connected with one end of a resistor R3 and a pin 1 of a transistor Q3; the other end of the resistor R3 is respectively connected with a turn number conversion LK pin 5, a transistor Q3 pin 2 and an input signal UO; the pin 3 of the transistor Q3 is respectively connected with the positive terminal of the capacitor C6 and the output signal OUT 2; the negative end of the capacitor C6 is connected with a ground wire GND; the number-of-turns conversion LK pin 1 is connected with a data encoder U2 pin 8; the power frequency modulation module meets the requirement of communication distance by changing working frequency, and stable transmission of communication is completed.
According to one aspect of the invention, the communication fusion module comprises an inductor L1, an inductor L2, an inductor L3, an inductor L4, a capacitor C8, a diode D2, a resistor R8, an operational amplifier U3, a resistor R7, a resistor R6 and a capacitor C9, wherein one end of the inductor L1 is connected with the input signal port 1; one end of the inductor L2 is connected with an input signal port 2; one end of the inductor L3 is connected with an input signal port 3; one end of the inductor L4 is connected with the input signal port 4; the other end of the inductor L1 is respectively connected with the other end of an inductor L2, the other end of an inductor L3, the other end of an inductor L4, the negative electrode end of a capacitor C8, the positive electrode end of a diode D2 and a pin 6 of a U2 of a data encoder; the positive end of the capacitor C8 is respectively connected with the negative end of the diode D2, one end of the resistor R8 and the pin 3 of the operational amplifier U3; the other end of the resistor R8 is respectively connected with a pin 6 of an operational amplifier U3 and an output signal OUT 1; the pin 2 of the operational amplifier U3 is respectively connected with one end of a resistor R6, one end of a capacitor C9 and one end of a resistor R7; the other end of the resistor R7 is connected with a pin 7 of an operational amplifier U3 and a voltage signal + 12V; pin 4 of the operational amplifier U1 is connected with a ground wire GND; the communication fusion module performs fusion adjustment on the multipath dispersed signals to ensure the integrity of output signals.
According to an aspect of the present invention, the operational amplifier U3 is connected to the inductor L1, the inductor L2, the inductor L3, and the inductor L4 to form a multi-signal fusion circuit, so that the distributed signals are fused and adjusted to be maintained in the same output path.
According to an aspect of the present invention, the number of turns conversion LK finely adjusts the voltage frequency converted by the resistor R5 by using the varactor diode D1 according to the input signal UO and the signal input of the data encoder U2, and compensates for the requirement of the actual communication distance by changing the operating frequency and the antenna parameters, thereby improving the communication quality.
According to one aspect of the invention, the modulation method of the magnetic communication modulation circuit based on the underground wireless sensor network is characterized in that a magnetic communication module is establishedThe magnetic induction signal transceiver is formed by two mutually coupled hollow coils, the central axes of a transmitting coil and a receiving coil are parallel to the ground, the two coils are in concentric positions, and the radius of the transmitting coil and the radius of the receiving coil are set to be a1And a2R is the distance between two coils;
step 1, constructing a magnetic communication equivalent circuit;
step 11, respectively defining two groups of equivalent circuits to obtain UsIs an AC signal source, RsIs the internal resistance of the signal source, C1And C2Is the resonance capacitance, R, of the transmitting coil and the receiving coilLFor loading the receiving coil with an impedance, R1And R2Obtaining the internal resistances of the transmitting coil and the receiving coil according to the set parameters:
R1＝2πN1a1R0
R2＝2πN2a2R0
wherein R is0Is the unit length coil resistance, N1And N2The number of turns of the transmitting coil and the number of turns of the receiving coil are respectively;
step 12, L1And L2The inductances of the transmitter and receiver, respectively, are then derived:
Figure BDA0002663033960000041
Figure BDA0002663033960000042
wherein μ is the permeability of the soil;
step 2, obtaining a mutual inductance mode between the transmitting coil and the receiving coil according to a mutual inductance principle:
Figure BDA0002663033960000043
step 3, according to the equivalent calculation of the transmission efficiency eta, the receiving and sending wireless signals, the communication distance and the load resistance, further obtaining:
Figure BDA0002663033960000044
wherein U isLRepresenting the voltage dissipated across the load resistor.
According to one aspect of the invention, the magnetic flux equivalent circuit is specifically characterized in that through the operation processing of data parameters, the defects of electromagnetic wave communication dynamic channel environment and wireless communication transmission are overcome through magnetic induction communication, and an underground wireless communication technology transmission system is optimized, so that the requirement of underground magnetic communication on the communication distance and the transmission efficiency of underground magnetic communication are mutually restricted, and when the transmission efficiency reaches a peak value, the communication distance is compensated through balancing the system operating frequency and wireless communication signals, and the transmission quality of communication signals is improved.
According to one aspect of the invention, the capacitor C4, the capacitor C5, the capacitor C6, the capacitor C7 and the capacitor C8 are all electrolytic capacitors; the diode D2 and the diode D3 are voltage-stabilizing diodes; the type of the triode Q1 is NPN; the model of the triode Q2 is PNP; the model of the band amplifier U1 is F733; the data encoder is U2 with model number PT 2262; the transmitter S1 is 315M; the model of the operational amplifier U3 is TL 081; the type of the humidity sensitive resistor SD is HR 202.
According to one aspect of the invention, a control method of a magnetic flux modulation circuit based on an underground wireless sensor network is characterized in that an acoustic-electric conversion suppression module controls current which changes after conversion through an acoustic-electric filtering conversion module, and then the current is filtered through an operational amplifier U5, and the method comprises the following specific steps:
step 1, one end of a resistor R21 receives surge current generated by an acousto-electric filtering conversion module through an INPUT electric signal INPUT, a power supply +6V is additionally added through a resistor R22 to further improve the response of resistance, the surge current is reduced to a range allowing conduction, an operational amplifier U5 performs addition and subtraction operation on the INPUT signal according to the value of an output signal to meet the output requirement, and a resistor R23 is grounded to protect detection equipment and disperse current when the current is too large in the operation of the operational amplifier U5;
step 2, the resistor 24 and the resistor R25 are connected in series to inhibit temperature drift of the resistor and reduce heat, the capacitor R26 and the capacitor C16 form a parallel circuit, oscillation of the circuit is inhibited, the resistor R26 absorbs electric energy stored by the capacitor C16 and prevents the capacitor C16 from overlarge discharge current to avoid damaging a connecting device, the diode D7 and the diode D6 have one-way conductivity, the diode D7 controls the conduction direction of the electric energy stored by the capacitor C16, and the negative end of the diode D6 obtains +9V of a power supply, so that the transmission speed of surge current inhibition is improved.
Has the advantages that: the invention designs a magnetic flux communication modulation circuit based on an underground wireless sensor network and a modulation method thereof, based on a magnetic induction principle, by taking the establishment of a magnetic flux communication circuit model as an entry point, applying a mutual inductance theory, deriving expressions of load power, path loss and transmission efficiency, obtaining specific relations between the path loss and the transmission efficiency and antenna parameters, working frequency and communication distance respectively through operational analysis, and making up for the requirement of actual communication distance by changing the working frequency and the antenna parameters, thereby improving the communication quality and providing a safe and stable transmission path for the underground wireless sensor network circuit.
Drawings
Fig. 1 is a block diagram of the present invention.
Fig. 2 is a magnetic flux modulation circuit diagram of a wireless sensor network of the present invention.
Fig. 3 is a circuit diagram of a wireless signal amplifying module according to the present invention.
Fig. 4 is a circuit diagram of the power frequency modulation module of the present invention.
Fig. 5 is a circuit diagram of a communication convergence module of the present invention.
Fig. 6 is a schematic structural diagram of a magnetic communication model of the present invention.
Fig. 7 is an equivalent circuit schematic of the present invention.
Detailed Description
In this embodiment, as shown in fig. 1, a magnetic flux modulation circuit based on an underground wireless sensor network comprises: the wireless signal processing device comprises a wireless signal amplification module, a wireless signal transmitting module, an induction control module, a power frequency modulation module and a communication fusion module;
the wireless signal amplification module is used for expanding the input signal, adjusting the conversion from the input signal to the output signal and expanding the signal transmission;
the wireless signal transmitting module is used for carrying out channel modulation on the received communication signals and transmitting the modulated signals;
the induction control module is used for finishing the transmission process from input to output of the magnetic communication by managing the running state of the wireless signal transmitting module;
the power frequency modulation module is used for finishing stable transmission of communication by changing the working frequency to make up for the requirement of communication distance;
and the communication fusion module is used for carrying out fusion adjustment on the multipath dispersed signals and ensuring the integrity of the output signals.
In a further embodiment, as shown in fig. 3, the wireless signal amplifying module includes a resistor R9, a resistor R10, a variable resistor RV1, a band amplifier U1, a capacitor C10, a capacitor C11, a resistor R11, and a resistor R12.
IN a further embodiment, pin 1 of the band amplifier U1 IN the wireless signal amplifying module is connected to one end of a resistor R9 and a wireless signal input terminal IN +, respectively; the other end of the resistor R9 is respectively connected with one end of a resistor R10, a pin 5 of a band amplifier U1, one end of a resistor R11, one end of a resistor R12 and a voltage signal of-6V; the other end of the resistor R10 is respectively connected with a wireless signal output end IN-, a frequency band amplifier U1 pin 2; pin 8 of the band amplifier U1 is connected with a voltage signal + 6V; pin 7 of the band amplifier U1 is connected with one end of a capacitor C10; pin 6 of the band amplifier U1 is connected with one end of a capacitor C11; pin 9 of the band amplifier U1 is respectively connected with pin 1 and pin 3 of a variable resistor RV 1; pin 4 of the band amplifier U1 is connected with pin 2 of a variable resistor RV 1; the other end of the capacitor C10 is connected with the other end of the resistor R11; the other end of the capacitor C11 is connected with the other end of the resistor R12.
In a further embodiment, the wireless signal transmitting module comprises a data encoder U2, a resistor R1, a capacitor C1, a capacitor C2, a resistor R2, a humidity sensitive resistor SD, and a transmitter S1.
In a further embodiment, pin 1 of the data encoder U2 in the wireless signal transmitting module is connected to the other end of the resistor R11; the other end of a pin 4 resistor R12 of the data encoder U2 is connected; the pin 9 of the data encoder U2 is respectively connected with one end of a capacitor C1, one end of a capacitor C2, one end of a resistor R2 and a ground wire GND; the other end of the capacitor C1 is respectively connected with the other end of the capacitor C2 and a voltage signal + 6V; the other end of the resistor R2 is respectively connected with one end of the humidity-sensitive resistor SD and a pin 14 of a data encoder U2; the other end of the humidity sensitive resistor SD is connected with a voltage signal + 12V; the pin 18 of the data encoder U2 is respectively connected with a pin 2 of a transmitter S1 and a voltage signal + 12V; the pin 17 of the data encoder U2 is connected with pin 1 of the transmitter S1; the pin 3 of the transmitter S1 is connected to ground GND.
In a further embodiment, the sensing control module includes a diode D3, a resistor R13, a capacitor C12, a capacitor C13, a capacitor C14, a resistor R14, an inductor L5, a transistor Q1, a resistor R15, a capacitor C15, and a transistor Q1.
In a further embodiment, the positive terminal of the diode D3 in the sensing control module is respectively connected to one terminal of a capacitor C12, one terminal of a capacitor C14, one terminal of an inductor L5, an emitter terminal of a transistor Q1, one terminal of a resistor R15, one terminal of a capacitor C15, a ground GND, and a pin 13 of a data encoder U2; the negative end of the diode D3 is respectively connected with one end of a resistor R13, an emitter end of a triode Q2 and a voltage signal of + 12V; the other end of the resistor R13 is respectively connected with the other end of the capacitor C12, one end of the resistor R14, the collector terminal of the triode Q1, the base terminal of the triode Q2, the other end of the capacitor C15, the other end of the resistor R15 and the collector terminal of the triode Q2; the other end of the resistor R14 is respectively connected with one end of a capacitor C13 and the base end of a triode Q1; the other end of the capacitor C13 is connected with the other end of the capacitor C14 and the other end of the inductor L5 respectively.
In a further embodiment, as shown in fig. 4, the power frequency modulation module includes a capacitor C3, a varactor D1, a capacitor C4, an electrothermal C5, a resistor R3, a resistor R4, a capacitor C7, a resistor R5, a transistor Q3, a capacitor C6, and a turn number switch LK.
In a further embodiment, one end of the capacitor C3 in the power frequency modulation module is respectively connected with the positive terminal of the capacitor C4, the positive terminal of the turn number conversion LK pin 2 and the positive terminal of the capacitor C5; the other end of the capacitor C3 is respectively connected with the negative electrode end of the variable capacitance diode D1 and one end of the resistor R4; the positive end of the variable capacitance diode D1 is respectively connected with the negative end of a capacitor C4, the turn number conversion LK pin 4, the pin 3, the negative end of a capacitor C7 and the ground wire GND; the positive end of the capacitor C7 is respectively connected with one end of the resistor R5 and the other end of the resistor R4; the other end of the resistor R5 is connected with a voltage signal + 6V; the negative electrode end of the capacitor C5 is respectively connected with one end of a resistor R3 and a pin 1 of a transistor Q3; the other end of the resistor R3 is respectively connected with a turn number conversion LK pin 5, a transistor Q3 pin 2 and an input signal UO; the pin 3 of the transistor Q3 is respectively connected with the positive terminal of the capacitor C6 and the output signal OUT 2; the negative end of the capacitor C6 is connected with a ground wire GND; the number-of-turns conversion LK pin 1 is connected to a data encoder U2 pin 8.
In a further embodiment, as shown in fig. 5, the communication fusion module includes an inductor L1, an inductor L2, an inductor L3, an inductor L4, a capacitor C8, a diode D2, a resistor R8, an operational amplifier U3, a resistor R7, a resistor R6, and a capacitor C9.
In a further embodiment, one end of the inductor L1 in the communication fusion module is connected to the input signal port 1; one end of the inductor L2 is connected with an input signal port 2; one end of the inductor L3 is connected with an input signal port 3; one end of the inductor L4 is connected with the input signal port 4; the other end of the inductor L1 is respectively connected with the other end of an inductor L2, the other end of an inductor L3, the other end of an inductor L4, the negative electrode end of a capacitor C8, the positive electrode end of a diode D2 and a pin 6 of a U2 of a data encoder; the positive end of the capacitor C8 is respectively connected with the negative end of the diode D2, one end of the resistor R8 and the pin 3 of the operational amplifier U3; the other end of the resistor R8 is respectively connected with a pin 6 of an operational amplifier U3 and an output signal OUT 1; the pin 2 of the operational amplifier U3 is respectively connected with one end of a resistor R6, one end of a capacitor C9 and one end of a resistor R7; the other end of the resistor R7 is connected with a pin 7 of an operational amplifier U3 and a voltage signal + 12V; and pin 4 of the operational amplifier U1 is connected with the ground line GND.
In a further embodiment, the operational amplifier U3 is connected to the inductor L1, the inductor L2, the inductor L3, and the inductor L4 to form a multi-signal fusion circuit, so as to perform fusion adjustment on the distributed signals and maintain the signals in the same output path.
In a further embodiment, the number of turns conversion LK finely adjusts the voltage frequency converted by the resistor R5 by using the varactor diode D1 according to the input signal UO and the signal input of the data encoder U2, and compensates for the requirement of the actual communication distance by changing the working frequency and the antenna parameters, thereby improving the communication quality.
In a further embodiment, as shown in fig. 2, the capacitor C4, the capacitor C5, the capacitor C6, the capacitor C7 and the capacitor C8 are all electrolytic capacitors; the diode D2 and the diode D3 are voltage-stabilizing diodes; the type of the triode Q1 is NPN; the model of the triode Q2 is PNP; the model of the band amplifier U1 is F733; the data encoder is U2 with model number PT 2262; the transmitter S1 is 315M; the model of the operational amplifier U3 is TL 081; the type of the humidity sensitive resistor SD is HR 202.
In a further embodiment, the method for modulating the magnetic communication modulation circuit based on the underground wireless sensor network is characterized in that a magnetic communication model is established, a magnetic induction signal receiving and transmitting device is formed by two mutually coupled hollow coils, the central axes of a transmitting coil and a receiving coil are parallel to the ground, the two coils are in concentric positions, and the radiuses of the transmitting coil and the receiving coil are set to be a1And a2R is the distance between two coils;
step 1, constructing a magnetic communication equivalent circuit;
step 11, respectively defining two groups of equivalent circuits to obtain UsIs an AC signal source, RsIs the internal resistance of the signal source, C1And C2Is the resonance capacitance, R, of the transmitting coil and the receiving coilLFor loading the receiving coil with an impedance, R1And R2For the internal resistances of the transmitter coil and the receiver coil, and thus according to the settingThe parameters of (a) yield:
R1＝2πN1a1R0
R2＝2πN2a2R0
wherein R is0Is the unit length coil resistance, N1And N2The number of turns of the transmitting coil and the number of turns of the receiving coil are respectively;
step 12, L1And L2The inductances of the transmitter and receiver, respectively, are then derived:
Figure BDA0002663033960000091
Figure BDA0002663033960000092
wherein μ is the permeability of the soil;
step 2, obtaining a mutual inductance mode between the transmitting coil and the receiving coil according to a mutual inductance principle:
Figure BDA0002663033960000093
step 3, according to the equivalent calculation of the transmission efficiency eta, the receiving and sending wireless signals, the communication distance and the load resistance, further obtaining:
Figure BDA0002663033960000094
wherein U isLRepresenting the voltage dissipated across the load resistor.
In a further embodiment, the magnetic flux equivalent circuit specifically is characterized in that through operation processing of data parameters, magnetic induction communication is used for making up for the defects of an electromagnetic wave communication dynamic channel environment and wireless communication transmission, and an underground wireless communication technology transmission system is optimized, so that the requirement of underground magnetic communication on a communication distance and the transmission efficiency of underground magnetic communication are mutually restricted, and when the transmission efficiency reaches a peak value, the communication distance is made up by balancing system operating frequency and wireless communication signals, and the transmission quality of communication signals is improved.
In summary, the present invention has the following advantages: make up communication distance's needs through changing operating frequency and antenna parameter, and then improve communication quality, provide safe and stable transmission path for underground wireless sensor network circuit, the extension of rethread signal, thereby strengthen the modulation to weak signal, the transmission quality to the modulation promotion signal of magnetic communication signal has been strengthened in the joining of power frequency modulation module, rethread capacitor C8, electric capacity C7 stores and filters, promote magnetic communication modulation circuit's stability, diode D2, diode D3 control signal's unidirectional transmission, reduce transmission path's loss, promote communication quality.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.

Claims (10)

1. A magnetic communication modulation circuit based on an underground wireless sensor network is characterized by comprising a wireless signal amplification module, a wireless signal transmitting module, an induction control module, a power frequency modulation module and a communication fusion module;
the wireless signal amplification module is used for expanding the input signal, adjusting the conversion from the input signal to the output signal and expanding the signal transmission;
the wireless signal transmitting module is used for carrying out channel modulation on the received communication signals and transmitting the modulated signals;
the induction control module is used for finishing the transmission process from input to output of the magnetic communication by managing the running state of the wireless signal transmitting module;
the power frequency modulation module is used for finishing stable transmission of communication by changing the working frequency to make up for the requirement of communication distance;
and the communication fusion module is used for carrying out fusion adjustment on the multipath dispersed signals and ensuring the integrity of the output signals.
2. The magnetic signal modulation circuit based on the underground wireless sensor network is characterized IN that the wireless signal amplification module comprises a resistor R9, a resistor R10, a variable resistor RV1, a band amplifier U1, a capacitor C10, a capacitor C11, a resistor R11 and a resistor R12, wherein a pin 1 of the band amplifier U1 is respectively connected with one end of a resistor R9 and a wireless signal input end IN +; the other end of the resistor R9 is respectively connected with one end of a resistor R10, a pin 5 of a band amplifier U1, one end of a resistor R11, one end of a resistor R12 and a voltage signal of-6V; the other end of the resistor R10 is respectively connected with a wireless signal output end IN-, a frequency band amplifier U1 pin 2; pin 8 of the band amplifier U1 is connected with a voltage signal + 6V; pin 7 of the band amplifier U1 is connected with one end of a capacitor C10; pin 6 of the band amplifier U1 is connected with one end of a capacitor C11; pin 9 of the band amplifier U1 is respectively connected with pin 1 and pin 3 of a variable resistor RV 1; pin 4 of the band amplifier U1 is connected with pin 2 of a variable resistor RV 1; the other end of the capacitor C10 is connected with the other end of the resistor R11; the other end of the capacitor C11 is connected with the other end of the resistor R12.
3. The magnetic signal modulation circuit based on the underground wireless sensor network is characterized in that the wireless signal transmission module comprises a data encoder U2, a resistor R1, a capacitor C1, a capacitor C2, a resistor R2, a humidity-sensitive resistor SD and a transmitter S1, wherein the pin 1 of the data encoder U2 is connected with the other end of the resistor R11; the other end of a pin 4 resistor R12 of the data encoder U2 is connected; the pin 9 of the data encoder U2 is respectively connected with one end of a capacitor C1, one end of a capacitor C2, one end of a resistor R2 and a ground wire GND; the other end of the capacitor C1 is respectively connected with the other end of the capacitor C2 and a voltage signal + 6V; the other end of the resistor R2 is respectively connected with one end of the humidity-sensitive resistor SD and a pin 14 of a data encoder U2; the other end of the humidity sensitive resistor SD is connected with a voltage signal + 12V; the pin 18 of the data encoder U2 is respectively connected with a pin 2 of a transmitter S1 and a voltage signal + 12V; the pin 17 of the data encoder U2 is connected with pin 1 of the transmitter S1; the pin 3 of the transmitter S1 is connected to ground GND.
4. The magnetic communication modulation circuit based on the underground wireless sensor network is characterized in that the induction control module comprises a diode D3, a resistor R13, a capacitor C12, a capacitor C13, a capacitor C14, a resistor R14, an inductor L5, a triode Q1, a resistor R15, a capacitor C15 and a triode Q1, wherein the positive end of the diode D3 is respectively connected with one end of the capacitor C12, one end of the capacitor C14, one end of the inductor L5, the emitter end of the triode Q1, one end of the resistor R15, one end of the capacitor C15, a ground wire GND and a pin 13 of a data encoder U2; the negative end of the diode D3 is respectively connected with one end of a resistor R13, an emitter end of a triode Q2 and a voltage signal of + 12V; the other end of the resistor R13 is respectively connected with the other end of the capacitor C12, one end of the resistor R14, the collector terminal of the triode Q1, the base terminal of the triode Q2, the other end of the capacitor C15, the other end of the resistor R15 and the collector terminal of the triode Q2; the other end of the resistor R14 is respectively connected with one end of a capacitor C13 and the base end of a triode Q1; the other end of the capacitor C13 is connected with the other end of the capacitor C14 and the other end of the inductor L5 respectively.
5. The magnetic flux communication modulation circuit based on the underground wireless sensor network is characterized in that the power frequency modulation module comprises a capacitor C3, a varactor D1, a capacitor C4, an electrothermal C5, a resistor R3, a resistor R4, a capacitor C7, a resistor R5, a transistor Q3, a capacitor C6 and a turn number conversion LK, wherein one end of the capacitor C3 is connected with the positive end of the capacitor C4, the turn number conversion LK pin 2 and the positive end of the capacitor C5 respectively; the other end of the capacitor C3 is respectively connected with the negative electrode end of the variable capacitance diode D1 and one end of the resistor R4; the positive end of the variable capacitance diode D1 is respectively connected with the negative end of a capacitor C4, the turn number conversion LK pin 4, the pin 3, the negative end of a capacitor C7 and the ground wire GND; the positive end of the capacitor C7 is respectively connected with one end of the resistor R5 and the other end of the resistor R4; the other end of the resistor R5 is connected with a voltage signal + 6V; the negative electrode end of the capacitor C5 is respectively connected with one end of a resistor R3 and a pin 1 of a transistor Q3; the other end of the resistor R3 is respectively connected with a turn number conversion LK pin 5, a transistor Q3 pin 2 and an input signal UO; the pin 3 of the transistor Q3 is respectively connected with the positive terminal of the capacitor C6 and the output signal OUT 2; the negative end of the capacitor C6 is connected with a ground wire GND; the number-of-turns conversion LK pin 1 is connected to a data encoder U2 pin 8.
6. The magnetic communication modulation circuit based on the underground wireless sensor network is characterized in that the communication fusion module comprises an inductor L1, an inductor L2, an inductor L3, an inductor L4, a capacitor C8, a diode D2, a resistor R8, an operational amplifier U3, a resistor R7, a resistor R6 and a capacitor C9, wherein one end of the inductor L1 is connected with an input signal port 1; one end of the inductor L2 is connected with an input signal port 2; one end of the inductor L3 is connected with an input signal port 3; one end of the inductor L4 is connected with the input signal port 4; the other end of the inductor L1 is respectively connected with the other end of an inductor L2, the other end of an inductor L3, the other end of an inductor L4, the negative electrode end of a capacitor C8, the positive electrode end of a diode D2 and a pin 6 of a U2 of a data encoder; the positive end of the capacitor C8 is respectively connected with the negative end of the diode D2, one end of the resistor R8 and the pin 3 of the operational amplifier U3; the other end of the resistor R8 is respectively connected with a pin 6 of an operational amplifier U3 and an output signal OUT 1; the pin 2 of the operational amplifier U3 is respectively connected with one end of a resistor R6, one end of a capacitor C9 and one end of a resistor R7; the other end of the resistor R7 is connected with a pin 7 of an operational amplifier U3 and a voltage signal + 12V; and pin 4 of the operational amplifier U1 is connected with the ground line GND.
7. The magnetic communication modulation circuit based on the underground wireless sensor network is characterized in that the operational amplifier U3 is connected with the inductor L1, the inductor L2, the inductor L3 and the inductor L4 to form a fusion circuit of multiple signals, so that the dispersed signals are fused and adjusted and are maintained in the same output path.
8. The magnetic flux modulation circuit based on the underground wireless sensor network is characterized in that the number of turns of the turn switching LK is used for finely adjusting the voltage frequency converted by the resistor R5 by using the variable capacitance diode D1 according to the input signal UO and the signal input of the data encoder U2, and the requirement of the actual communication distance is made up by changing the working frequency and the antenna parameters, so that the communication quality is improved.
9. A method for modulating a magnetic communication modulation circuit of an underground wireless sensor network according to any one of claims 1 to 8, characterized in that a magnetic communication model is established, a magnetic induction signal transceiver is formed by two mutually coupled hollow coils, the central axes of a transmitting coil and a receiving coil are parallel to the ground, the two coils are in concentric positions, and the radius of the transmitting coil and the radius of the receiving coil are set to be a1And a2R is the distance between two coils;
step 1, constructing a magnetic communication equivalent circuit;
step 11, respectively defining two groups of equivalent circuits to obtain UsIs an AC signal source, RsIs the internal resistance of the signal source, C1And C2Is the resonance capacitance, R, of the transmitting coil and the receiving coilLFor loading the receiving coil with an impedance, R1And R2Obtaining the internal resistances of the transmitting coil and the receiving coil according to the set parameters:
R1＝2πN1a1R0
R2＝2πN2a2R0
wherein R is0Is the unit length coil resistance, N1And N2The number of turns of the transmitting coil and the number of turns of the receiving coil are respectively;
step 12, L1And L2The inductances of the transmitter and receiver, respectively, are then derived:
Figure FDA0002663033950000031
Figure FDA0002663033950000032
wherein μ is the permeability of the soil;
step 2, obtaining a mutual inductance mode between the transmitting coil and the receiving coil according to a mutual inductance principle:
Figure FDA0002663033950000033
step 3, according to the equivalent calculation of the transmission efficiency eta, the receiving and sending wireless signals, the communication distance and the load resistance, further obtaining:
Figure FDA0002663033950000041
wherein U isLRepresenting the voltage dissipated across the load resistor.
10. The modulation method of the magnetic communication modulation circuit of the underground wireless sensor network according to claim 9, wherein the magnetic communication equivalent circuit compensates for the defects of the electromagnetic wave communication dynamic channel environment and the wireless communication transmission by magnetic induction communication through the operation processing of data parameters, and optimizes the transmission system of the underground wireless communication technology, so that the requirement of the underground magnetic communication on the communication distance and the transmission efficiency of the underground magnetic communication are restricted with each other, and when the transmission efficiency reaches a peak value, the communication distance is compensated by balancing the system operating frequency and the wireless communication signal, and the transmission quality of the communication signal is improved.
CN202010910373.8A 2020-09-02 2020-09-02 Magnetic communication modulation circuit based on underground wireless sensor network and modulation method thereof Withdrawn CN112272153A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117052380A (en) * 2023-10-10 2023-11-14 四川宏大安全技术服务有限公司 Wireless pressure measurement device and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117052380A (en) * 2023-10-10 2023-11-14 四川宏大安全技术服务有限公司 Wireless pressure measurement device and method
CN117052380B (en) * 2023-10-10 2024-01-02 四川宏大安全技术服务有限公司 Wireless pressure measurement device and method

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