CN115696649A

CN115696649A - Near-electric-field coupling type wireless networking communication system and method for complete buried space

Info

Publication number: CN115696649A
Application number: CN202211310086.9A
Authority: CN
Inventors: 吴丽娟; 林琳; 董世伟
Original assignee: Beijing Baitaituo Technology Co ltd
Current assignee: Beijing Baitaituo Technology Co ltd
Priority date: 2022-10-25
Filing date: 2022-10-25
Publication date: 2023-02-03

Abstract

The invention belongs to the technical field of near field communication, and particularly relates to a near electric field coupling type wireless networking communication system and method for a complete buried space, which comprises the following steps: the system comprises a plurality of slave communication nodes, a wireless networking network and a wireless networking network, wherein the slave communication nodes are used for collecting the environmental data of the space in which the slave communication nodes are arranged at intervals on a metal cable of a goaf and communicate with other nodes through near field coupling of the metal cable, and each slave communication node and the corresponding metal cable form the wireless networking network; and the main communication node is used for gathering environment data of each slave communication node and is connected with an upper computer to realize goaf environment monitoring, the main communication node is arranged on a coal face, one end of a metal cable is connected with the main communication node, and the other end of the metal cable longitudinally penetrates through the goaf and extends to a complete buried space. The invention couples the electric field signal to the metal cable or induces the electric field signal fed out from other nodes on the metal cable to carry out wireless networking communication through the symmetrical electric dipole antenna of the communication node, and can ensure the communication quality of the communication node near the metal cable under the condition of complete burying.

Description

Near-electric-field coupling type wireless networking communication system and method for complete buried space

Technical Field

The invention belongs to the technical field of near field communication, and particularly relates to a near electric field coupling type wireless networking communication system and method for a completely buried space.

Background

According to related regulations of mine fire prediction and monitoring in coal mine safety regulations, a mine with a natural fire danger needs to regularly check the conditions of CO and other harmful gases; establishing a coal mine spontaneous combustion monitoring system, and determining coal seam spontaneous combustion marker gas and a critical value; in the process of sealing, managing and unsealing the fire zone, the temperature, gas components and the like in the fire zone should be analyzed.

The existing goaf fire monitoring technology mainly comprises a beam tube method and an optical fiber temperature measurement method, wherein the beam tube method is used for carrying out early warning by indirectly monitoring gas concentration and cannot position the position of a fire, and the optical fiber temperature measurement method has the defects that the false alarm rate is too high after the optical fiber is extruded and cannot be reliably applied. The technology for preventing the high temperature point of the coal mine goaf based on the temperature method is the most promising means for managing the fire disaster of the goaf, and the networking of the temperature collection nodes of the goaf in a wireless communication mode is the most promising method, but due to the special environment of the goaf, the communication nodes can be buried by conductive media such as abandoned coal blocks, coal gangue, sandstone and even underground water (the thickness is 5-10 meters, and a small gap is reserved between the communication nodes and the sandstone on the upper layer), so that great challenges are brought to the design of a wireless communication system. The existing wireless networking method mainly comprises Bluetooth, zigBee, wi-Fi, lora and the like, wherein the Bluetooth and the WiFi work in a 2.4G frequency band, the Zigbee works in a plurality of frequency bands such as 2.4G, 868MHz, 915MHz and the like, and the Lora works in 433MHz, 868MHz, 915MHz and the like, so that the communication frequency of the wireless networking means is over 400 MHz. In a complete burying environment, the problem that electromagnetic waves are seriously absorbed when propagating in semiconductor media such as coal, sand, seawater and the like cannot be propagated in a long distance, a 170MHz frequency test communication is used for a university of North and Central team to have a farthest distance of less than 5 meters under a goaf burying condition, and when the frequency is higher than 400MHz, the communication in a longer distance is difficult to realize. Therefore, the above-mentioned existing wireless networking communication means is difficult to be used for wireless networking communication demands in a completely buried space. Systems and methods for through-the-earth communications, proposed by marshall radio telemetry, usa, for wirelessly transmitting signals through the earth between a transmit antenna and a receive antenna, producing significant far-field radiation through the communications antenna and the type of interaction, in addition to magnetic coupling, substantially by transmission and absorption of electromagnetic radiation, are generally selected at much higher frequencies than are conventionally used for through-the-earth (TTE) communications. The method can work at the frequency of 0.1 MHz-3 MHz, but is not suitable for a completely buried environment because the size of the antenna is large and a reserved space needs to be preset at the periphery of the antenna.

Disclosure of Invention

Therefore, the invention provides a near-electric field coupling type wireless networking communication system and method for a completely buried space, which can support larger communication bandwidth while ensuring higher penetrability so as to meet the requirement of multi-node networking.

According to the design scheme provided by the invention, a totally buried space near electric field coupling type wireless networking communication system is provided, which comprises the following contents:

the plurality of slave communication nodes are arranged on the goaf metal cable at intervals and are in near field coupling communication with the corresponding metal cable segments, and each slave communication node and the corresponding metal cable segment form a wireless networking network;

and the main communication node is used for gathering environment data of each slave communication node and is connected with an upper computer to realize goaf environment monitoring, the main communication node is arranged on a working surface of the goaf, one end of the metal cable is connected with the main communication node, and the other end of the metal cable longitudinally penetrates through the goaf and extends to a complete buried space.

As a totally buried space near-electric field coupling wireless networking communication system in the present invention, further, the communication node includes: the sealed cabin body, and set up the sensor module that is used for collecting environmental gas and temperature data in the sealed cabin body, the master control circuit module who is connected with the sensor module, be used for with the communication module of other node wireless communication network deployment, be used for providing the battery module of voltage and be used for carrying out the power management module of conversion output with battery module voltage for the node.

As a near-electric field coupling type wireless networking communication system of the completely buried space of the present invention, further, the cabin includes: cylindrical casing that stainless steel material made sets up the ventilative waterproof valve on cylindrical casing terminal surface, and sets up the sealed plug connector that is used for connecting external communication antenna on another terminal surface of cylindrical casing: and a burying-proof filter screen for preventing the air-permeable waterproof valve from being blocked is also arranged on the cylindrical shell.

As a near electric field coupling type wireless networking communication system of a completely buried space in the present invention, further, the power management module is provided with a clock module for providing sleep and wake-up signals of both the communication module and the sensor module, and the sleep or wake-up signals provided by the clock module are used to turn off or turn on the power of the communication module and the sensor module.

As the near-electric field coupling type wireless networking communication system of the completely buried space of the present invention, further, the communication module comprises: the communication antenna is arranged on the sealed cabin body and is connected with the power driving circuit and the signal amplifying circuit through the impedance matching circuit, the communication antenna is used for sending a radio frequency signal of a communication node to the metal cable rope in a close-range coupling mode, and the metal cable rope receives an induction signal so as to realize wireless communication networking with other communication nodes.

As the near electric field coupling type wireless networking communication system of the completely buried space, further, the communication antenna adopts a symmetrical electric dipole antenna.

As the near electric field coupling type wireless networking communication system of the completely buried space, further, the communication nodes are wrapped by insulating outer skins, and the communication nodes are placed on the periphery of the metal cable or fixed on the metal cable.

Further, based on the above system, the present invention further provides a method for completely buried space near electric field coupling type wireless networking communication, comprising:

setting the length of a communication node antenna according to the communication carrier frequency of an application scene and adjusting the matching parameters of the communication node; the method comprises the following steps that a metal cable longitudinally laid in a goaf is used as a wireless communication channel, and a wireless communication networking network is constructed through cable-carried communication between each communication node which is preset in the goaf and is coupled with a metal cable near field and other nodes;

the method comprises the steps that a communication node connected with a working face end of a metal cable is arranged to serve as a main communication node, other communication nodes on the metal cable serve as slave communication nodes, goaf environment data collected from the communication nodes are gathered to the working face main communication node through a wireless communication networking network, and an upper computer connected with the working face main communication node analyzes and processes the received environment data to monitor the completely buried space environment.

As the wireless networking communication method, further, each communication node is placed around the metal cable or fixed with the metal cable in an electrically insulated manner, and adjacent communication nodes are arranged at a predetermined distance according to an application scene.

The invention has the beneficial effects that:

the invention takes the metal cable as a channel, couples an electric field signal with a certain frequency to the metal cable or induces electric field signals fed out from other nodes on the cable through the symmetrical electric dipole antenna of the communication node to carry out wireless networking communication, ensures that a plurality of communication nodes fixed near the cable can carry out stable and reliable wireless communication under the condition of complete burying, and can be used for the wireless networking communication in extreme environments such as underground complete burying space or underwater and the like; furthermore, the communication node protects a circuit and a battery from being damaged by falling rocks or being flooded by water in the gob by utilizing a ventilating, waterproof and smash-resistant cabin structure, introduces a ventilating and waterproof valve, and ensures that gas enters the cabin and isolates water under the condition of complete burying by additionally arranging a metal filter screen; the power management module utilizes a 'dormancy-awakening' working mode, namely, the power of the communication module and the power of the sensor module are turned off during dormancy, and the power of the communication module and the power of the sensor module are turned on during awakening, so that the power consumption of the system is reduced, and the endurance time of the system is prolonged; furthermore, a small-size and low-cost symmetrical electric dipole antenna is utilized, the antenna is insulated from a peripheral medium, and the antenna is connected with a rear-end driving or amplifying circuit through a matching circuit so as to ensure higher conversion efficiency; by adopting a master-slave networking mode, OFDM technology can be used in a physical layer, BPSK modulation can be used, and the system has stronger anti-noise and anti-burst interference performances and can be used for communication in a strong-interference environment in a well; at the MAC layer, the method can be realized based on a TDMA mechanism, can provide a collision avoidance mechanism, and can support the concurrent communication of a plurality of nodes; on a network layer, a single master node can support 300 slave nodes at most based on modes such as dynamic routing and multipath addressing, and key support is provided for underground goaf fire monitoring and underwater wireless networking communication.

Description of the drawings:

FIG. 1 is a schematic diagram of a communication principle of a fully buried space near-electric field coupled wireless networking in an embodiment;

FIG. 2 is a schematic representation of the connection of a communication node to a metal cable in an embodiment;

FIG. 3 is a schematic diagram of a communication node structure in the embodiment;

FIG. 4 is a schematic view of the cabin according to the embodiment;

FIG. 5 is a schematic view of the structure of the cabin in the embodiment;

FIG. 6 is a schematic diagram of the "sleep-awake" operation mode in the embodiment;

FIG. 7 is a block diagram of a communication module according to an embodiment;

FIG. 8 is a schematic diagram of a networking structure in the embodiment;

FIG. 9 is a schematic view of an underwater test scene in the embodiment;

FIG. 10 is a frequency spectrum and waterfall illustration of a received signal in an embodiment;

fig. 11 is a diagram showing the demodulation result in the embodiment.

In the figure, the reference numeral 1 represents a main communication node, the reference numeral 2 represents a slave communication node, the reference numeral 3 represents a burying medium, the reference numeral 4 represents a metal cable, the reference numeral 5 represents a cabin body, the reference numeral 51 represents a shell, the reference numeral 52 represents a sealing plug connector, the reference numeral 53 represents a ventilating waterproof valve, and the reference numeral 54 represents a burying-preventing filter screen.

The specific implementation mode is as follows:

in order to make the objects, technical solutions and advantages of the present invention clearer and more obvious, the present invention is further described in detail below with reference to the accompanying drawings and technical solutions.

The magnetoelectric near field coupling type wireless penetration communication technology solves the problem of wireless communication in a complete buried space, can realize point-point data transmission, but has the problems of difficult design of goaf anti-smashing protection due to large size of a magnetic induction antenna, large power consumption due to low magnetoelectric conversion efficiency of an induction coil and the like, and is difficult to deploy and apply on a large scale. The embodiment of the invention provides a near electric field coupling type wireless networking communication system of a complete buried space, which comprises the following contents:

the system comprises a plurality of slave communication nodes, a plurality of wireless networking devices and a wireless networking network, wherein the slave communication nodes are used for collecting the environmental data of the space in which the slave communication nodes are arranged at intervals on a goaf metal cable and are in near field coupling communication with corresponding metal cable sections, and each slave communication node and the corresponding metal cable section form the wireless networking network;

The metal cable laid in the goaf is used as a wireless communication channel, the metal cable is laid longitudinally along the goaf, the communication nodes are coupled with the metal cable in a near field mode through symmetrical electric dipole antennas, and wireless communication networking is conducted with other nodes through cable-mounted wireless communication. The communication nodes mainly complete the functions of collecting temperature and gas data of the goaf, encoding information, modulating and demodulating communication, generating and analyzing a multi-node wireless networking protocol and the like, all the nodes preset in the goaf regularly converge the collected data to a main node of a coal face through a network, and key support is provided for fire monitoring of the underground goaf and underwater wireless networking communication.

Referring to fig. 1, a plurality of metal cables for coal safety certification penetrate through a goaf along the longitudinal direction, one end of each cable is located on a coal face and connected with a communication main node, the other end of each cable extends to the deep part of the goaf (buried by left coal and gravels), a plurality of communication nodes are fixed on each metal cable through insulating layers, the communication nodes utilize symmetrical electric dipole antennas of the communication nodes to perform electric field interaction with the cables in a near electric field coupling mode, the nodes are wirelessly communicated and networked, each node is provided with temperature and CO, methane, oxygen, acetylene, ethylene and other gas sensors, all the nodes regularly gather data to the main node, and the main node is the same as the communication nodes in structural composition and different in network permission. The communication nodes acquire surrounding environment parameters by using self-contained temperature and gas sensors, then encode and modulate the parameters and feed the parameters to the symmetrical electric dipole antenna by a driving circuit at a certain carrier frequency, the electric field is induced to the metal cable by the dipole antenna, the dipole antenna at the far-end node receives the signal from the cable in an induction manner, and the signal is amplified, demodulated and decoded to realize wireless communication of data, and designated data is sent and received among the communication nodes according to a communication protocol to realize goaf environment monitoring.

The metal cable can be regarded as a wireless communication channel artificially constructed in the goaf, and the material of the metal cable can adopt a high-strength metal cable which accords with coal safety certification, and can also be made of other metal conductive materials. The cable can be exposed or wrapped with the insulating fire-resistant rubber, when the exposed cable is used, the cable is in direct contact with a peripheral medium, particularly when water exists, the communication signal is greatly attenuated due to high conductivity, larger communication transmitting power is needed, the communication bandwidth is limited, the networking efficiency is influenced, compared with the cable, the cable has smaller path loss, can realize remote communication only by needing smaller transmitting power, and has wider supported channel bandwidth, but the laying cost and complexity are slightly higher than those of the cable.

Referring to fig. 2, the metal cable is coupled to the communication node, i.e. the communication node is not electrically connected to the metal cable, and the communication node only needs to be fixed near the metal cable. The main function of the cable is to sense the electromagnetic waves radiated by the node antenna and couple them to other nodes at the far end. The antennas of the communication nodes are wrapped by the insulating outer skins and placed on the periphery of the metal cable (usually fixed on the metal cable and mutually electrically insulated), and the plurality of communication nodes are arranged at a certain distance along the metal cable to achieve the purpose of covering the goaf. Reliable communication is still ensured once the cable is broken by falling rocks. In order to reduce the communication path loss, the metal cable needs to be wrapped by an insulating material and insulated from the surrounding medium, and the end face of the cable can contact the surrounding medium and can also be insulated.

Further, in this embodiment, referring to fig. 3, a communication node includes: the sealed cabin body, and set up the sensor module that is used for collecting environmental gas and temperature data in the sealed cabin body, the master control circuit module who is connected with the sensor module, be used for with the communication module of other node wireless communication network deployment, be used for providing the battery module of voltage and be used for carrying out the power management module of conversion output with battery module voltage for the node.

As a preferred embodiment, further, the enclosure comprises: the cylindrical casing that stainless steel material made sets up the ventilative waterproof valve on cylindrical casing terminal surface, and sets up the sealed plug connector that is used for connecting external communication antenna on another terminal surface of cylindrical casing: and a burying-proof filter screen for preventing the air-permeable waterproof valve from being blocked is also arranged on the cylindrical shell.

Referring to fig. 4 and 5, the cabin may be a watertight structure made of high strength stainless steel material, which functions to prevent other modules placed inside from being damaged by falling rocks or from entering water. The whole body can adopt a cylindrical structure, one end face of the cylinder is provided with a ventilating waterproof valve to ensure that gas enters and water enters are isolated, the other end face of the cylinder is provided with a sealing connector used for connecting a circuit inside the cabin body and a communication antenna outside the cabin body, the tail end of the cabin body is connected with a burial-proof filter screen, the filter screen is made of stainless steel pipes with holes, and the function of the filter screen is to prevent sand stones or left coal from blocking the ventilating waterproof valve.

Further, the power management module is provided with a clock module for providing sleep and wake-up signals of both the communication module and the sensor module, and the power of the communication module and the sensor module is turned off or on by using the sleep or wake-up signals provided by the clock module.

The battery module is composed of a lithium battery or a dry battery, is used for providing voltage in the range of 5-7V, and needs to use a battery with self-discharge time longer than 1 year. The power management module is used for converting the voltage of the battery module, outputting 3.3V voltage to the main control module and the communication module, meeting the explosion-proof requirement of the coal mine case and ensuring that the fire cannot happen under the condition of short circuit of the power supply. In order to ensure that the system can continuously work for several months under the condition of battery power supply, in the embodiment of the scheme, the power management module adopts a 'sleep-wake up' working mode, as shown in fig. 6, according to a clock, the power of the communication module and the power of the sensor module are turned off during sleep, and the power of the communication module and the power of the sensor module are turned on during wake up, so that the power consumption of the system is saved to the maximum extent.

Further, referring to fig. 7, the communication module includes: the communication antenna is arranged on the sealed cabin body and is connected with the power driving circuit and the signal amplifying circuit through the impedance matching circuit, the communication antenna is used for sending a radio frequency signal of a communication node to the metal cable rope in a close-range coupling mode, and the metal cable rope receives an induction signal so as to realize wireless communication networking with other communication nodes. Further, the communication antenna adopts a symmetrical electric dipole antenna.

The symmetrical electric dipole antenna is used as a communication antenna and is connected with the power driving and signal amplifying circuit through the impedance matching circuit. The antenna is connected with the internal circuit board through a sealed connector of the cabin body, and radio frequency communication signals are fed to the metal cable or induction signals are received by the cable in a close-range coupling (non-electrical connection) mode, so that wireless communication networking between the communication node and other nodes is realized. The sensor module in the communication node can be composed of CO and O ₂ Methane, acetylene, ethylene, temperature sensors, etc. for collecting environmental gas and temperature parameters.

Further in accordance with a preferred embodiment, the communication nodes are wrapped with an insulating sheath and the communication nodes are placed around the perimeter of or secured to the metal cable. The communication nodes are arranged along the metal cable, and different spacing distances can be designed according to actual needs. The antenna of the communication node is closely coupled with the metal cable, usually without electrical connection, and energy exchange is carried out in a near electric field coupling mode to realize information transmission. If conditions allow the antenna and the metal cable to be electrically connected, the communication distance is further expanded.

For a goaf with the width of 200 meters and the depth of 3000 meters, 200-400 communication nodes need to be laid if full coverage is to be realized. For realizing wireless communication networking among nodes, referring to fig. 8, all communication nodes adopt a master-slave networking method, an OFDM technology and BPSK modulation can be used in a physical layer, and a collision avoidance mechanism can be provided based on a TDMA mechanism in an MAC layer, so that concurrent communication of a plurality of nodes can be supported; in a network layer, a networking mode of one master node and multiple slaves can be realized based on dynamic routing, multipath addressing and other modes, and a single master node can support 300 slave nodes at most

Further, based on the above system, an embodiment of the present invention further provides a method for completely buried space near-electric field coupling type wireless networking communication, including:

setting the length of a communication node antenna according to the communication carrier frequency of an application scene and adjusting the matching parameters of the communication node; the method comprises the following steps that a metal cable longitudinally laid in a goaf is used as a wireless communication channel, and a wireless communication networking network is constructed between each communication node which is preset in the goaf and coupled with a metal cable in a near field mode and other nodes through cable-carried communication;

The communication node performs near-electric field coupling between the symmetrical electric dipole antenna of the communication node and the cable, and feeds electromagnetic waves with preset carrier frequency to the metal cable or receives signals transmitted by other communication nodes in an induction manner; nodes in the plurality of communication nodes are networked in a master-slave mode, so that data interaction is realized.

Furthermore, each communication node is placed on the periphery of the metal cable or fixed with the metal cable in an electric insulation mode, the adjacent communication nodes are arranged at preset intervals according to application scenes, and different intervals can be designed according to actual needs.

The wireless communication frequency is usually 2 MHz-8 MHz to ensure higher penetrability and larger communication bandwidth, and 0.1 MHz-0.5 MHz frequency can be used in a scene requiring long distance and small limitation on the size of an antenna. After the size of the communication node antenna is determined, the impedance matching parameters of the communication module circuit in the communication node are adjusted according to the communication frequency. Laying metal cables and communication nodes on a buried layer in a complete buried space, and laying a main control node on a coal face; the communication nodes acquire surrounding environment parameters by using self-contained temperature and gas sensors, then encode and modulate the parameters and feed the parameters to the symmetrical electric dipole antenna by a driving circuit at a certain carrier frequency, the electric field is induced to the metal cable by the dipole antenna, the dipole antenna at the far-end node receives the signal from the cable in an induction manner, and the signal is amplified, demodulated and decoded to realize wireless communication of data, and the data of the designated address is sent and received among the communication nodes according to a communication protocol.

To verify the validity of the scheme, the following further explanation is made by combining experimental data:

a lake test is taken as a test scene, as shown in FIG. 9, the water depth is 3 meters, the bottom of the lake is a mud bottom, two communication nodes are used for the test, one communication node is positioned at the bottom of the lake, the other communication node is positioned on the surface of the lake, the horizontal distance between the two communication nodes is 100 meters, the communication transmission power is 500mW, the communication rate is 9600bit/s, and the communication interval is 1s.

By selecting a communication frequency f and setting a symmetrical electric dipole antenna working at the frequency point and matching circuit parameters thereof, the dipole antenna is composed of a coaxial cable outer shielding layer, the end surface is watertight, and the length and the diameter of the dipole antenna depend on the working frequency f; the communication module cyclically transmits 10 bytes such as "0x11 0x33 0x55 0x77 0x99 0xAA 0xCC 0xBB 0x66 0x88" for testing, and the transmission interval is 1s. The wire rope is made of six kinds of wires with 10mm diameter and 150 m length and insulating sheath. One end of the metal cable is tied with the communication node and is sunk to the bottom of the lake, and the other end of the metal cable extends out of the water surface and is in close contact with the other communication node (a certain distance is ensured, and physical contact is not needed). And respectively connecting the water surface communication node with a computer and a spectrometer, observing whether the signal sent by the underwater part can be received, and demodulating and decoding.

Experimental results as shown in fig. 10 and 11, it can be seen from the spectrum diagram in fig. 10 that the signal is higher than 20dB, while the waterfall diagram can see the equal interval signal transmission rhythm. As can be seen from the demodulation result in fig. 11, the water surface communication node can accurately demodulate the data sent by the underwater communication node. According to the data, the scheme can be used for solving the problem of wireless networking communication under the complete burying conditions of a coal mine goaf or deep sea water and the like.

Unless specifically stated otherwise, the relative steps, numerical expressions and values of the components and steps set forth in these embodiments do not limit the scope of the present invention.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.

The elements of the various examples and method steps described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and the components and steps of the examples have been described in a functional generic sense in the foregoing description for clarity of hardware and software interchangeability. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

Those skilled in the art will appreciate that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, which may be stored in a computer-readable storage medium, such as: read-only memory, magnetic or optical disk, and the like. Alternatively, all or part of the steps of the foregoing embodiments may also be implemented by using one or more integrated circuits, and accordingly, each module/unit in the foregoing embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present invention is not limited to any specific form of combination of hardware and software.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A fully buried space near-electric field coupled wireless networking communication system, comprising:

and the main communication node is used for gathering environment data of each slave communication node and is connected with an upper computer to realize goaf environment monitoring, the main communication node is arranged on a working surface of the goaf, one end of the metal cable is connected with the main communication node, and the other end of the metal cable longitudinally penetrates through the goaf and extends to a completely buried space.

2. The fully buried space near-electric field coupled wireless networking communication system of claim 1, wherein the communication node comprises: the sealed cabin body, and set up the sensor module that is used for collecting environmental gas and temperature data in the sealed cabin body, the master control circuit module who is connected with the sensor module, be used for with the communication module of other node wireless communication network deployment, be used for providing the battery module of voltage and be used for carrying out the power management module of conversion output with battery module voltage for the node.

3. The fully buried space near-electric field coupled wireless networking communication system of claim 2, wherein the enclosure comprises: cylindrical casing that stainless steel material made sets up the ventilative waterproof valve on cylindrical casing terminal surface, and sets up the sealed plug connector that is used for connecting external communication antenna on another terminal surface of cylindrical casing: and a burying-proof filter screen for preventing the air-permeable waterproof valve from being blocked is also arranged on the cylindrical shell.

4. The fully buried space near-electric field coupled wireless networking communication system according to claim 2, wherein the power management module is provided with a clock module for providing sleep and wake-up signals of both the communication module and the sensor module, and the sleep or wake-up signals provided by the clock module are used to turn off or on power of the communication module and the sensor module.

5. The fully buried space near-electric field coupled wireless networking communication system of claim 2, wherein the communication module comprises: the communication antenna is arranged on the sealed cabin body and is connected with the power driving circuit and the signal amplifying circuit through the impedance matching circuit, the communication antenna is used for sending a radio frequency signal of a communication node to the metal cable rope in a close-range coupling mode, and the metal cable rope receives an induction signal so as to realize wireless communication networking with other communication nodes.

6. The fully buried space near-electric field coupled wireless networking communication system of claim 5, wherein the communication antenna is a symmetric electric dipole antenna.

7. The fully buried space near-electric field coupled wireless networking communication system of claim 1, wherein the communication nodes are further wrapped with an insulating sheath and placed around or secured to the metal cables.

8. A fully buried space near-electric field coupled wireless networking communication method, implemented based on the system of claim 1, comprising the following steps:

setting the antenna length of a communication node and adjusting the matching parameters of the communication node according to the communication carrier frequency of an application scene; the method comprises the following steps that a metal cable longitudinally laid in a goaf is used as a wireless communication channel, and a wireless communication networking network is constructed through cable-carried communication between each communication node which is preset in the goaf and is coupled with a metal cable near field and other nodes;

the communication node that sets up and be connected with metal cable working face end is as main communication node, and other communication nodes on the metal cable are as from communication node, utilize wireless communication network deployment network to assemble the collecting space area environmental data who gathers from communication node to working face main communication node, and the host computer that working face main communication node connects is come to carry out analysis processes to the environmental data that receives to the realization is to the monitoring of totally burying space environment.

9. The near-field coupled wireless networking communication method for the total buried space of claim 8, wherein each communication node is placed around the metal cable or fixed in an electrically insulated manner with the metal cable, and adjacent communication nodes are arranged at a predetermined distance according to an application scenario.

10. The completely buried space near-electric field coupled wireless networking communication method according to claim 8 or 9, wherein a 2 MHz-8 MHz scene frequency interval, or a 0.1 MHz-0.5 MHz scene frequency interval is adopted according to an application scene communication carrier frequency.