CN220067424U - Cross-medium magnetic communication system - Google Patents
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- CN220067424U CN220067424U CN202322844853.0U CN202322844853U CN220067424U CN 220067424 U CN220067424 U CN 220067424U CN 202322844853 U CN202322844853 U CN 202322844853U CN 220067424 U CN220067424 U CN 220067424U
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Abstract
The utility model discloses a cross-medium magnetic communication system, which comprises: a transmitting unit and a receiving unit; the transmission unit includes: a high-voltage transient power amplifier and a transmitting coil which is arranged in a medium and has a detection frequency of 30 kHz; the method comprises the steps that after the information to be sent is amplified by a high-voltage transient power amplifier, a transmitting coil is excited to generate an alternating magnetic field and transmit magnetic information; the receiving unit includes: a magnetic sensor disposed in the other medium for converting the received transmitted magnetic information into received electrical information. The system can give consideration to the ground permeability and the communication bandwidth, and the communication is not easily affected by geology, so that the communication performance is stable.
Description
Technical Field
The utility model relates to the technical field of communication systems, in particular to a cross-medium magnetic communication system based on a magnetic information technology.
Background
Currently, conventional cross-medium wireless communication technologies include radio frequency communication, laser communication and the like.
The radio frequency communication is a high frequency communication mode with the frequency range of 300 kHz-300 GHz, the principle is that information is converted into radio signals, then the radio signals are transmitted through electromagnetic waves in the air, a sender encodes the information into the radio signals to be sent out together by using a modulation technology, and a receiver demodulates and converts the signals back to the original information by using a demodulation technology. The wireless transmission has flexibility and convenience, the radio frequency signals can be transmitted in a longer distance, multiplexing allows multiple signals to be transmitted simultaneously, and the spectrum utilization rate is improved; and the radio frequency signal has certain anti-interference capability, and the influence of interference on the signal can be reduced through modulation and coding technology. However, the radio frequency has some disadvantages, such as very high frequency of radio frequency signal, very fast attenuation when crossing obstacles, which may result in signal quality degradation or signal loss, and poor ground penetrating performance, so that it is not suitable for civil air defense engineering.
Another traditional cross-medium laser communication uses laser as a carrier, converts various signals into modulated beams, and demodulates the modulated beams after receiving the modulated beams by a laser receiving device, so that the required signals are separated from the laser beams, and the laser communication has the advantages of large communication capacity, high transmission speed, strong confidentiality, light structure, low attenuation and the like. However, laser communication is susceptible to weather effects, such as absorption of optical signals by atmospheric molecules; the tiny particles have scattering effect on the optical signals; severe weather severely attenuates the laser; the atmospheric turbulence has the influence on beam deflection, beam diffusion, image dithering and the like generated by laser transmission; in addition, the laser beam has extremely high directivity, so that precise alignment between the transmitting and receiving devices is ensured to ensure accurate transmission of the laser beam, which puts high demands on stability and accuracy of the devices, and the devices and infrastructure costs of the laser communication system are high, including lasers, optical elements, tracking systems, and the like. Most importantly, laser communication does not have the ability to traverse opaque obstacles, and does not have ground penetrating properties. Therefore, the traditional cross-medium laser communication is not suitable for civil air defense engineering.
In order to solve the problem of poor ground penetrating performance, a certain team in China proposes a communication system using ground penetrating D waves as civil air defense engineering. The earth penetrating D wave emergency communication system uses a pair of current probes, communication is established in an earth medium through induction current density, the upper stratum and the lower stratum are equivalent to two polar plates of one capacitor, the earth is equivalent to the medium of the capacitor, and the conductivity of the medium is continuously changed because the moisture in the earth is continuously changed, so that the impedance is also continuously changed, and the communication performance is further influenced. That is, the communication performance of the system depends on the conductivity of the earth medium, the signal frequency, the contact impedance of the electrode and the soil, other external environments and the like, so that the system is easily influenced by the earth channel, noise and environment, the communication performance is unstable, and the technology is in an exploration stage at home and abroad and does not have engineering conditions.
Thus, the disadvantages of the above techniques are: the communication performance is unstable.
Disclosure of Invention
Based on the background technology, in order to solve the problem of unstable communication performance in the prior art, the following technical scheme is provided:
in an embodiment of the present utility model, there is provided a cross-medium magnetic communication system, including: a transmitting unit and a receiving unit;
the transmitting unit includes: a high-voltage transient power amplifier and a transmitting coil which is arranged in a medium and has a detection frequency of 30 kHz; the method comprises the steps that after the information to be sent is amplified by a high-voltage transient power amplifier, a transmitting coil is excited to generate an alternating magnetic field and transmit magnetic information;
the receiving unit includes: a magnetic sensor disposed in the other medium for converting the received transmitted magnetic information into received electrical information.
Further, the diameter of the transmitting coil is 2 m, and the number of turns of the coil is 30.
Further, a signal of 30kHz can be received at 30 meters radially of the transmitting coil.
Further, the high voltage transient power amplifier employs a 1000 watt high voltage transient power amplifier.
Further, the transmitting unit further includes: the device comprises a microphone, an A/D module, an electronic switch and a signal source DDS;
the microphone collects voice information, the A/D module digitizes the voice information, the digitized voice information is modulated on a signal source DDS by controlling the electronic switch, and the modulated information is used as electric information to be sent to the high-voltage transient power amplifier;
the receiving unit further includes: and the demodulation module is used for demodulating the received electric information into voice information.
Further, the transmitting unit further includes: and the pickup module is used for amplifying and denoising voice information acquired by the microphone and sending the processed information to the A/D module.
Further, the transmitting unit further includes: and the tone quality compression module is used for tone quality compression of the digitized voice information and modulating the compressed information on the signal source DDS by controlling the electronic switch.
Further, the receiving unit further includes: a primary amplifier, a band-pass filter and a secondary amplifier electrically connected in sequence between the magnetic sensor and the demodulation module.
Further, the receiving unit further includes: the device comprises a voice reduction module, a D/A module, a power amplifier and a loudspeaker;
the voice restoration module restores the demodulated voice information, simulates the voice information through the D/A module, amplifies the voice information through the power amplifier and drives the loudspeaker to play.
Compared with the prior art, the embodiment of the utility model provides a cross-medium magnetic communication system, which has the following beneficial effects:
the embodiment of the utility model provides a system capable of realizing underground and overground communication in civil air defense engineering in severe environments, namely, the communication is not easily affected by the environment through a magnetic information technology, and the system can be used for realizing stable and safe communication, so that unnecessary casualties and untimely information transmission are reduced. Wherein, adopt the detection frequency to be 30 kHz's transmitting coil, still considered ground permeability and communication bandwidth.
Drawings
FIG. 1 is a schematic diagram of a cross-medium magnetic communication system according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a transmitting unit in a cross-medium magnetic communication system according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of a receiving unit in a cross-medium magnetic communication system according to an embodiment of the present utility model.
Detailed Description
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
In one embodiment, a cross-media magnetic communication system is provided, the system comprising: the system comprises a sending unit, a receiving unit, an embedded system and a power module. See fig. 1 for connection.
The transmission unit includes: the microphone, the pickup module, the A/D module, the electronic switch, the signal source DDS and the high-voltage transient power amplifier excite the transmitting coil and are mainly responsible for information input. Firstly, a microphone collects voice information, the voice information is amplified and denoised through a pickup module, and an A/D module digitizes the voice information; and then the digital voice information is subjected to tone quality compression by the embedded system, a modulation signal is generated by controlling the electronic switch, and the transmitting coil is excited to generate an alternating magnetic field through the high-voltage transient power amplifier, so that the information is transmitted.
The receiving unit includes: the device comprises a high-sensitivity magnetic sensor, a primary amplifying circuit, a band-pass filter, a demodulation circuit, a D/A module, a power amplifier and a loudspeaker. The high-sensitivity magnetic sensor converts the magnetic information field into weak electric signals, and after primary amplification, band-pass filtering and secondary amplification treatment, voice information is demodulated through the demodulation module; the embedded system performs the processes of verification, restoration and the like on the demodulated voice information, simulates the voice information through the D/A module, and drives the loudspeaker to play after power amplification.
The embedded system comprises: tone quality compression algorithm (the algorithm is an existing mature algorithm, no problem of algorithm improvement exists), a screen, a reserved port and the like. The voice quality control method has the functions of man-machine interaction, voice quality compression of digitalized voice data, modulation signal generation through control of an electronic switch and voice quality restoration. The embedded system is used for completing the functions of the tone quality compression module and the voice restoration module, and is of course only one technical means; the tone quality compression module and the voice restoration module can also be completed by adopting a hardware chip.
The power module, i.e. the portable detachable battery pack, provides 3.3V, 12V and 300V power to the system.
When the cross-medium magnetic communication system is applied to civil air defense engineering in actual use, a transmitting unit and a receiving unit are arranged on the ground, and a receiving unit and a transmitting unit are also arranged underground; the underground transmitting unit and the underground receiving unit form an issuing channel, and the underground transmitting unit and the underground receiving unit form an issuing channel, so that an underground receiving and transmitting double channel is formed to form a perfect cross-medium magnetic communication system.
Theoretical analysis:
the transmitting coil was excited to emit a magnetic signal using a high voltage transient power amplifier of 1000 watts with a transmitting coil diameter d=2000 millimeters and a probing frequency f=30 kHz. The transmitting coil adopts a 30-turn coil, and the circuit structure formed by the transmitting coil and the transmitting coil has 140nF capacitance, 200uH inductance, 37.7 omega impedance and 26.5A corresponding current.
Subsurface attenuation formula:
attenuation coefficient:
wherein,
mu is magnetic permeability, the earth is close to air magnetic permeability, mu=mu 0 ＝4×π×10 -7 H/m。
σ is the medium conductivity, which is different from one medium conductivity to another, as can be seen from table 1.
Therefore, get(σ＝5×10 -3 S/m，z＝30m)。
TABLE 1 penetration depth of electromagnetic waves in conductive media
The magnetic field strength generated at a point in space for the N coils is:
where N represents the number of turns of the coil, I represents the current intensity, R represents the radius of the coil, and x represents the spatial point-to-coil radial distance.
Therefore B 0 ＝18.5nT(x＝30m)。
Thus, after attenuation b=b 0 e -αz ＝8.917nT。
Experimental analysis (scaling experiment):
experimental conditions: the diameter of the transmitting coil is 200mm, the probing frequency is 30kHz, the high-voltage transient power amplifier is 1000 watts, the coil is 30 turns, the capacitance is 100nF, the inductance is 200uH, and the radial distance between the monitoring point and the transmitting coil is 30 meters (non-air medium).
In order to achieve both the ground penetrating property and the communication bandwidth, the scheme of the utility model selects and uses the detection frequency of 30 kHz.
The experiment uses a Gaussian meter to measure the magnetic induction intensity, and the output of the Gaussian meter is connected with a 100-time amplifier and is input into a spectrometer after being amplified.
When the transmitting end is not operating, the spectrometer is shown to be-47 dbm at 30 kHz.
When the transmitting end is in operation, the spectrometer is shown to be-31 dbm at 30 kHz.
Under the experimental conditions, an electromagnetic wave signal with the frequency of 30kHz can be obviously received at a point which is 30 meters away from the radial direction of the transmitting coil. Thus, a transmitting coil 2 meters in diameter can receive a signal of 30kHz at 30 meters.
Compared with the prior art, the utility model has the following advantages:
(1) The method realizes effective communication of different mediums such as underground, underwater and the like, and can keep a reliable communication state under the condition that other communication equipment in civil air defense engineering is destroyed completely. Which correspondingly solves the problem of stable communication.
(2) And the two-way real-time voice and short message communication are realized, and the installation and the use are convenient and quick. The two-way real-time voice intercom can be realized, and meanwhile, the two-way short message communication is realized.
(3) The 3KHz-30KHz very low frequency is adopted to enhance the communication capability of the communication device through the ground, the unique encoding and decoding technology is adopted to realize the digitization and modularization of data transmission, the dual functions of anti-interference and information transmission confidentiality are achieved, and the communication distance through the ground is increased. The corresponding solution has good ground penetrating performance.
(4) The flexible magnetic communication coil unit is adopted, so that the flexible magnetic communication coil unit can be distributed along with the device, has strong damage resistance, is simple to debug, is easy to use, and is portable. Which corresponds to a complex arrangement of the solution devices.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (9)
1. A cross-media magnetic communication system, comprising: a transmitting unit and a receiving unit;
the transmitting unit includes: a high-voltage transient power amplifier and a transmitting coil which is arranged in a medium and has a detection frequency of 30 kHz; the method comprises the steps that after the information to be sent is amplified by a high-voltage transient power amplifier, a transmitting coil is excited to generate an alternating magnetic field and transmit magnetic information;
the receiving unit includes: a magnetic sensor disposed in the other medium for converting the received transmitted magnetic information into received electrical information.
2. The cross-medium magnetic communication system of claim 1, wherein the transmit coil has a diameter of 2 meters and a number of turns of 30 turns.
3. The cross-medium magnetic communication system of claim 2, wherein a 30kHz signal can be received at 30 meters radially of the transmit coil.
4. The cross-medium magnetic communication system of claim 1, wherein the high voltage transient power amplifier is a 1000 watt high voltage transient power amplifier.
5. The cross-medium magnetic communication system of claim 1, wherein,
the transmitting unit further includes: the device comprises a microphone, an A/D module, an electronic switch and a signal source DDS;
the microphone collects voice information, the A/D module digitizes the voice information, the digitized voice information is modulated on a signal source DDS by controlling the electronic switch, and the modulated information is used as electric information to be sent to the high-voltage transient power amplifier;
the receiving unit further includes: and the demodulation module is used for demodulating the received electric information into voice information.
6. The cross-medium magnetic communication system of claim 5, wherein the transmitting unit further comprises: and the pickup module is used for amplifying and denoising voice information acquired by the microphone and sending the processed information to the A/D module.
7. The cross-medium magnetic communication system of claim 5 or 6, wherein the transmitting unit further comprises: and the tone quality compression module is used for tone quality compression of the digitized voice information and modulating the compressed information on the signal source DDS by controlling the electronic switch.
8. The cross-medium magnetic communication system of claim 5, wherein the receiving unit further comprises: a primary amplifier, a band-pass filter and a secondary amplifier electrically connected in sequence between the magnetic sensor and the demodulation module.
9. The cross-medium magnetic communication system of claim 5 or 8, wherein the receiving unit further comprises: the device comprises a voice reduction module, a D/A module, a power amplifier and a loudspeaker;
the voice restoration module restores the demodulated voice information, simulates the voice information through the D/A module, amplifies the voice information through the power amplifier and drives the loudspeaker to play.
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