Mine emergency communication system

Abstract

The invention provides a mine emergency communication system which comprises network management equipment, a downlink laser communication access device, a cascade laser communication device, an uplink laser communication access device and the like. The network management equipment is used for establishing a communication network, and the downlink laser communication access device communicates with the uplink laser communication access device in a laser wireless mode under the relay support of the cascade laser communication device, so that a laser wireless backbone communication link is established, and a communication service is provided for underground wireless terminal equipment. The system not only has the advantage of high bandwidth of a wired communication system, but also has the advantage of easy deployment of a wireless multi-hop network communication system, solves the problems of low bandwidth, short distance and the like of the existing wireless multi-hop network emergency communication system, can be widely applied to coal mines and non-coal mines, and has great significance in improving the technical level of mine emergency communication and improving the communication efficiency. The mine disaster rescue efficiency is improved, casualties and property loss are reduced, and the method has important application value.

Description

Technical Field

[0001] The invention relates to a mine emergency communication system, which relates to the fields of network communication technology, laser communication technology, wireless communication technology, etc. Background Art

[0002] The existing underground communication systems mainly include wired dispatching communication systems, mobile communication systems, broadcasting communication systems, ground-penetrating communication systems, and disaster relief communication systems. Among them, the wired dispatching system, mobile communication system, and broadcasting system all use communication cables, which are powered by local power supply equipment through power supply cables. The existing underground communication cables and power supply cables are generally installed along the tunnel wall. When coal and gas outbursts, gas explosions, impact ground pressure, roof collapse, floods, fires and other accidents occur underground, they are easily damaged. Therefore, these communication systems are easily affected by disasters and cannot be used normally. The ground-penetrating communication system is a communication system based on low-frequency ground-penetrating communication technology. It has a small impact on accidents and strong disaster resistance, but the transmitting antenna is large. Ground-penetrating communication generally adopts a one-way broadcast communication method. Underground personnel can only receive information from the well, but cannot send information. Only a limited number of chambers in the well can be equipped with transmitting equipment. After an accident occurs, the well still cannot know the situation of underground personnel who are not in the chamber, so the existing ground-penetrating communication system cannot meet the emergency communication needs of mines. The disaster relief communication system is carried by the rescue team members, and communication cannot be established in places that the rescue team cannot reach. Existing underground disaster relief communication systems mostly use wireless MESH communication systems, which can realize dynamic self-organizing networks and have good autonomous management and recovery capabilities. However, in actual applications, the system is used for communication hop limit, multi-level relay bandwidth loss and other issues, resulting in low transmission bandwidth, high transmission delay, and poor overall system stability. To solve the above problems, a new emergency wireless communication system is needed to improve the system's disaster resistance and provide reliable communication services for underground rescue personnel after underground disasters occur. Summary of the invention

[0003] The purpose of the present invention is to provide a mine emergency communication system, which adopts laser wireless communication to establish a high-bandwidth backbone communication link, has the advantages of high transmission bandwidth, low transmission delay, and long transmission distance, so as to solve the problems existing in the existing wireless multi-hop network emergency communication system. The mine emergency communication system includes at least one network management device, at least one downlink laser communication access device, at least one uplink laser communication access device, at least one wireless communication access device, and at least one wireless terminal device; the system further includes a cascade laser communication device; the network management device is deployed above the mine, and the network management device is used to establish a communication network and is responsible for the management and data exchange of all devices accessing the network; a downlink laser communication access device is deployed at the mine entrance or the tunnel entrance, the network management device is connected to the downlink laser communication access device for communication via a communication cable, the downlink laser communication access device is connected to the uplink laser communication access device for communication via laser wireless communication, and the uplink laser communication access device is connected to the wireless communication access device for communication via a communication cable; the wireless communication access device is connected to the wireless terminal device underground via wireless communication, and provides wireless access and communication services with the network management device for the wireless terminal device; when the downlink laser communication access device and the uplink laser communication access device cannot communicate directly, one or more of the cascade laser communication devices are deployed along the mine tunnel to provide laser communication relay services.

[0004] 1. The mine emergency communication system further includes: the downlink laser communication access device includes a control unit, a communication unit, a switching unit, a laser communication unit, a human-computer interaction unit, an aiming unit, and a power supply unit; the switching unit is controlled by the control unit to complete the switching between the three connection states of the control unit and the communication unit, the control unit and the laser communication unit, and the communication unit and the laser communication unit; the aiming unit is used to align with the calibration unit of the uplink laser communication access device or the cascade laser communication device to ensure the laser communication between the laser communication units of the two devices; the aiming unit includes an aiming laser, a sight, and a gimbal; the aiming laser emits visible laser, which can produce a light spot on the aiming laser target of the paired calibration unit; the sight adopts a monocular telescope, which is used to remotely observe the aiming light target of the paired calibration unit; the gimbal can be adjusted in three axes to adjust the angle of the aiming unit.

[0005] 2. The mine emergency communication system further includes: the uplink laser communication access device includes a control unit, a communication unit, a switching unit, a laser communication unit, a human-computer interaction unit, a calibration unit, and a power supply unit; the switching unit is controlled by the control unit to complete the switching between the three connection states of the control unit and the communication unit, the control unit and the laser communication unit, and the communication unit and the laser communication unit; the calibration unit is used to align with the calibration unit of the uplink laser communication access device or the cascade laser communication device to ensure laser communication between the laser communication units of the two devices; the calibration unit includes an aiming laser, a sight, and a gimbal; the aiming laser emits visible laser, which can produce a light spot on the aiming laser target of the paired calibration unit; the sight adopts a monocular telescope, which is used to remotely observe the aiming light target of the paired calibration unit; the gimbal can be adjusted in three axes to adjust the angle of the aiming unit.

[0006] 3. The mine emergency communication system further includes: the cascade laser communication device includes a control unit, a switching unit, two laser communication units, a human-computer interaction unit, a calibration unit, an aiming unit, and a power supply unit; the switching unit is controlled by the control unit to complete the switching between the three connection states: the control unit and the downstream laser communication unit, the control unit and the upstream laser communication unit, and the downstream laser communication unit and the upstream laser communication unit. ; The calibration unit is used to align and match with the calibration unit of the uplink laser communication access device or the cascade laser communication device to ensure laser communication between the laser communication units of the two devices; the calibration unit includes an aiming laser, a sight, and a pan-tilt head; the aiming laser emits visible laser, which can produce a light spot on the aiming laser target of the paired calibration unit; the sight adopts a monocular telescope for remote observation of the aiming light target of the paired calibration unit; the pan-tilt head can be adjusted in three axes to adjust the angle of the aiming unit; the aiming unit is used to align and match with the calibration unit of the uplink laser communication access device or the cascade laser communication device to ensure laser communication between the laser communication units of the two devices; the aiming unit includes an aiming laser, a sight, and a pan-tilt head; the aiming laser emits visible laser, which can produce a light spot on the aiming laser target of the paired calibration unit; the sight adopts a monocular telescope for remote observation of the aiming light target of the paired calibration unit; the pan-tilt head can be adjusted in three axes to adjust the angle of the aiming unit.

[0007] The mine emergency communication system adopts laser wireless communication to establish a backbone communication link, which has the advantages of fast transmission speed, high bandwidth and easy deployment; the system relay cascade adopts photoelectric direct conversion, which does not require parsing and re-encoding of data content, avoids the transmission delay caused by data processing and forwarding, prevents transmission packet loss, and can greatly improve the system communication rate and distance. It can not only transmit monitoring, text and voice data, but also has the ability to remotely transmit high-definition video data. The mine emergency communication system has the advantages of high bandwidth of wired communication systems and easy deployment of wireless multi-hop network communication systems, solving the problems of low transmission bandwidth, high transmission delay, short transmission distance, etc. of existing wireless multi-hop network emergency communication systems. The mine emergency communication system can be widely promoted and applied to coal mines and non-coal mines, and has important application value in improving the technical level of mine emergency communication, improving the efficiency of mine disaster rescue, and reducing casualties and property losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 Schematic diagram of mine emergency communication system implementation plan 1.

[0009] Figure 2 Schematic diagram of mine emergency communication system implementation plan 2.

[0010] Figure 3 Schematic diagram of mine emergency communication system implementation plan 3.

[0011] Figure 4 Schematic diagram of the functional structure of the downlink laser communication access device.

[0012] Figure 5 Schematic diagram of the functional structure of the uplink laser communication access device.

[0013] Figure 6 Schematic diagram of the functional structure of the cascade laser communication device.

[0014] Figure 7 Schematic diagram of the structure and pairing of the laser aiming unit and calibration unit.

[0015] Figure 8 Flowchart of the connection process of the downlink laser communication access device.

[0016] Fig. 9 Flowchart of the connection process of the cascade laser communication device. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the application embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0018] The specific implementation method of the emergency communication system is as follows: Figure 1 As shown, the composition includes:

[0019] 1. Network management equipment (101), used to establish a communication network, responsible for the management and data exchange of all devices connected to the network. In this example, the network management equipment is installed on the emergency communication vehicle, used to establish an emergency communication network, which is connected to the core switch (107) of the original mine Ethernet in the mine, and can communicate with all devices connected to the mine Ethernet that can communicate normally. The emergency communication network is connected to the communication satellite (110) through a satellite antenna to achieve remote satellite communication. The emergency communication network includes but is not limited to mobile communication networks, dedicated Ethernet, the Internet, etc.

[0020] 2. Downlink laser communication access device (102), responsible for converting the communication signal transmitted by the network management device (101) through the communication cable into a laser signal for downlink transmission, and responsible for receiving the uplink laser signal and transmitting it to the network management device through the communication cable. In this embodiment, the downlink laser communication access device is deployed at the entrance of the lane, and communicates with the cascade laser communication device (103) deployed in the lane through laser wireless communication. The detailed functional structure of the downlink laser communication access device is in Figure 4 and detailed in its description.

[0021] 3. Cascade laser communication device (103), responsible for transmitting laser signals and changing the propagation direction of lasers to achieve laser communication relay. In this embodiment, a cascade laser communication device is deployed in the lane for laser communication relay between the downlink laser communication access device (102) and the uplink laser communication access device (104). The detailed functional structure of the cascade laser communication device is Figure 6 and detailed in its description.

[0022] 4. Uplink laser communication access device (104), responsible for converting the communication signal transmitted by the wireless communication access device (104) through the communication cable into a laser signal for uplink transmission, and also responsible for receiving the downlink laser signal and transmitting it to the wireless communication access device through the communication cable. The detailed functional structure of the uplink laser communication access device is Figure 5 and detailed in its description.

[0023] 5. A wireless communication access device (105), which is connected to a wireless terminal device (106) underground via wireless communication, and provides wireless access and communication services with the network management device (101) for the wireless terminal device.

[0024] The wireless communication standard of the wireless communication access device can adopt 2G, 3G, 4G, 5G mobile communication, Wifi or WSN, etc.

[0025] 6. A wireless terminal device (106) accesses the communication network through the wireless communication access device (105) and communicates with the equipment on the well.

[0026] 7. Core switch (107), the network management device of mining Ethernet, is responsible for the management and data exchange of all devices connected to mining Ethernet.

[0027] 8. Monitoring terminal (108), a terminal device used for mine communication, monitoring, surveillance, dispatching and command.

[0028] 9. Monitoring server (109), a data management device used for data storage and forwarding for mine monitoring and surveillance, providing data services for monitoring terminal (108).

[0029] 10. Communication satellite (110), used for satellite communication services.

[0030] 11. A satellite communication base station (111), used for connecting to a communication satellite.

[0031] 12. Remote monitoring terminal (112), a terminal device used for remote monitoring, surveillance, and emergency dispatch and command of mines.

[0032] The specific implementation method 2 of the emergency communication system is as follows Figure 2 The main differences between Implementation 2 and Implementation 1 are:

[0033] 1. The network management device (101) is a core switch of the mining Ethernet. The mining Ethernet is used as the communication network of the emergency communication system, and there is no need to establish a dedicated emergency communication network separately.

[0034] 2. The network management device is connected to the Internet, and the remote monitoring terminal (112) is connected to the mine Ethernet through the Internet for remote monitoring, surveillance, and emergency dispatch and command of the mine.

[0035] 3. The downlink laser communication access device (102) is deployed at the entrance of the mine, and is connected to the cascade laser communication device (103) deployed underground through laser wireless communication. The downlink laser communication access device (102) and the uplink laser communication access device (104) are connected by laser communication relay through multiple cascade laser communication devices.

[0036] The specific implementation method 3 of the emergency communication system is as follows Figure 3 The main difference between Embodiment 3 and Embodiment 2 is that the downlink laser communication access device (102) is deployed at the tunnel entrance underground, and directly communicates with the uplink laser communication access device (104) through laser wireless communication.

[0037] The functional structure of the downlink laser communication access device is as follows: Figure 4 As shown, it mainly includes:

[0038] 1. The control unit (201) is responsible for the functional control of all components of the human-machine exchange unit (205) to realize human-machine exchange, and controls the switching unit (203) to realize the interface switching between the communication unit (202) and the control unit / laser communication unit (204). The core of the control unit can adopt the STM32H7 series processor, which belongs to The processor has an operating frequency of up to 480MHz and includes USB OTG, Ethernet and SDMMC high-speed interfaces and I2C, SPI, UART, and CAN communication interfaces. The Ethernet interface is connected to a switching unit, and communication is switched with the communication unit through the switching unit.

[0039] 2. The communication unit (202) is connected to the network management device (101) via a communication cable in the uplink direction and is connected to the switching unit (203) in the downlink direction. The communication is switched between the switching unit (203) and the control unit (201) / laser communication unit (204). The core of the communication unit can adopt a W5500 Ethernet communication chip to realize a complete network communication function.

[0040] 3. The switching unit (203) is controlled by the control unit (201) to complete the switching between the three connection states: the control unit and the communication unit, the control unit and the laser communication unit, and the communication unit and the laser communication unit.

[0041] 4. A laser communication unit (204), comprising a transmitting part and a receiving part, wherein the transmitting part is composed of a transmitting signal processing circuit, a driving circuit and a transmitting module; the transmitting signal processing circuit is responsible for converting the communication signal into an original signal that can be transmitted by laser. In this embodiment, the transmitting signal processing circuit is responsible for converting the differential signal of the network communication into the input signal required by the driving circuit, and has the function of signal adjustment, and the core can be FPGA; the driving circuit is responsible for converting the signal processed by the transmitting signal into a signal that can drive the transmitting module to emit laser, and the core component can be MAX3669 produced by MAXIM; the transmitting module includes a laser diode, an insulating protector and a collimating device, and the laser diode can be LP650P007 produced by THORLABS, the insulating protector can be SRA9A, and the collimating device can be LTN300-A. The receiving part is composed of a receiving module, a signal amplifying circuit, and a receiving signal processing circuit; the receiving module includes a lens and a photosensitive element, the photosensitive element is responsible for receiving laser and converting it into an electrical signal, and the PDA36A photodetector of THORLABS can be selected; the signal amplifying circuit is used to amplify the weak electrical signal output by the photosensitive element, and the core component can be the low-noise amplifier OPA657 of Texas Instruments. The signal amplifying circuit also includes a filtering circuit for eliminating noise in the signal; the receiving signal processing circuit is responsible for converting the signal output by the signal amplifying circuit into a communication signal, and has the function of signal demodulation, and the core can be FPGA. In this embodiment, the output of the receiving signal processing circuit is a differential signal for network communication.

[0042] 5. The human-machine interaction unit (205) is a support unit required by the person operating the equipment (rescuer) to perform operations such as function setting, also known as a human-machine interface. The human-machine interaction unit consists of a display screen, indicator lights, a buzzer, and buttons. The display screen uses a liquid crystal display screen to display the device status, and a liquid crystal display screen with a touch function can be used; the indicator light uses an LED; the buzzer is used for sound indication of the status; the button is used for manual operation of the device, including multiple buttons such as power on / off, reset, and function operation. When the display screen is a touch screen, the number of buttons for function operation can be reduced or omitted.

[0043] 6. An aiming unit (206) is used to align with the calibration unit (208) of the uplink laser communication access device (104) or the cascade laser communication device (103) to ensure laser communication between the laser communication units of the two devices. The aiming unit includes an aiming laser, a sighting mirror, and a pan / tilt; the aiming laser emits visible laser light and can generate a light spot on the aiming laser target of the paired calibration unit; the sighting mirror uses a monocular telescope and is used to remotely observe the aiming light target of the paired calibration unit; the pan / tilt can be adjusted in three axes and is used to adjust the angle of the aiming unit.

[0044] 7. The power supply unit (207) is responsible for supplying power to other units of the device, including voltage conversion, battery, and battery management circuit. The voltage conversion is responsible for converting the voltage output by the battery into the working voltage required by each unit component, and can use LM1117, MAX1724 or TPS series power supply chips; the battery uses a lithium-ion battery with an internal protection circuit, and the battery management circuit is responsible for charging and protecting the lithium battery (group), and has functions such as anti-reverse connection, anti-overcharge, anti-over-discharge, overcurrent, short circuit, etc., as well as balanced charging and balanced discharging functions.

[0045] The functional structure of the uplink laser communication access device is as follows: Figure 5 As shown, the uplink laser communication access device includes a control unit, a communication unit, a switching unit, a laser communication unit, a human-computer interaction unit, a calibration unit, and a power supply unit; the main differences between the uplink laser communication access device and the downlink laser communication access device include:

[0046] 1. The communication cable connected to the communication unit (202) is connected to the wireless communication access device (105) to provide laser communication service for it.

[0047] 2. A calibration unit (208), which is used to align with the aiming unit of the downlink laser communication access device or the cascade laser communication device; the calibration unit includes an aiming laser target, an aiming light target, and a pan / tilt; the aiming laser target is used to display the light spot of the visible laser emitted by the aiming laser of the paired aiming unit; the aiming light target is used to provide a light source target for the aiming mirror of the paired aiming unit, and adopts an LED light-emitting element; the pan / tilt can be adjusted in three axes to adjust the angle of the calibration unit.

[0048] The cascade laser communication device is used for laser communication relay between a downlink laser communication access device (102) and an uplink laser communication access device (104), and the cascade laser communication device comprises a control unit, a switching unit, two laser communication units, a human-machine interaction unit, a calibration unit, an aiming unit, and a power supply unit. The functional structure of the cascade laser communication device is as follows: Figure 6 As shown, the main differences from the downlink laser communication access device and the uplink laser communication access device include:

[0049] 1. A calibration unit (208) and an aiming unit (206) are provided at the same time, wherein the calibration unit is used to align with the aiming unit of the downlink laser communication access device (102) or the upper-level cascade laser communication device; and the aiming unit is used to align with the calibration unit of the lower-level cascade laser communication device or the downlink laser communication access device.

[0050] 2. It has two laser communication units (204). One is a downlink laser communication unit, which is used for downlink communication and performs two-way laser communication with the cascade laser communication device of the next level or the downlink laser communication access device; the other is an uplink laser communication unit, which is used for uplink communication and performs two-way laser communication with the downlink laser communication access device (102) or the cascade laser communication device of the previous level.

[0051] 3. The switching unit (203) is controlled by the control unit (201) to complete the switching between the three connection states: the control unit and the downstream laser communication unit, the control unit and the upstream laser communication unit, and the downstream laser communication unit and the upstream laser communication unit.

[0052] Figure 7 This is a schematic diagram of the structure and pairing of the laser aiming unit and the calibration unit. The left side of the figure is the aiming unit, and the right side is the calibration unit, including:

[0053] 1. A panel (300) for fixing components used in combination with laser communication, aiming and calibration units.

[0054] 2. The aiming laser (301), a component of the aiming unit, emits visible laser light and can generate a light spot on the aiming laser target (306) of the paired calibration unit; this embodiment uses three aiming lasers arranged in an equilateral triangle.

[0055] 3. A transmitting module (302) for transmitting a laser signal for communication; the transmitting element of the aiming unit of this embodiment is located at the midpoint of the line connecting the upper aiming laser (301) and the center of the sighting mirror (304); the transmitting element of the calibration unit is located at the midpoint of the base of the equilateral triangle formed by the aiming laser target (306).

[0056] 4. A receiving module (303) for receiving the laser signal emitted by the emitting element (302); the receiving module of the aiming unit of this embodiment is located at the midpoint of the base of the equilateral triangle formed by the aiming laser (301); the receiving module of the calibration unit is located at the midpoint of the line connecting the center of the upper aiming laser target (306) and the aiming light target (307).

[0057] 5. The sight (304) is a monocular telescope used for remotely observing the aiming light target of the paired calibration unit. The sight in this embodiment is located at the center of the equilateral triangle formed by the aiming laser (301).

[0058] 6. A pan / tilt (305) is used to adjust the angle of the aiming unit or calibration unit. The pan / tilt in this embodiment is a mechanical pan / tilt with a spherical movable structure and can be manually adjusted in three axes.

[0059] 7. The aiming laser target (306) is a component of the calibration unit and is used to display the light spot of the visible laser emitted by the aiming laser of the paired aiming unit; corresponding to the aiming laser of the aiming unit, this embodiment uses three aiming laser targets arranged in an equilateral triangle.

[0060] 8. The aiming light target (307) is a component of the calibration unit and is used to provide a light source target for the sight of the paired aiming unit, using an LED light emitting element; in this embodiment, the aiming light target is located at the midpoint of the base of the equilateral triangle formed by the aiming laser target (306).

[0061] Figure 8 This is a flowchart of the connection process of the downlink laser communication access device. The specific steps include:

[0062] 1. (401) The control unit controls the switching unit to complete the connection between the control unit and the communication unit.

[0063] 2. (402) The control unit performs a communication test with the network management device. If the communication is normal, execute step (403), otherwise return to execute (401).

[0064] 3. (403) Observe the aiming light target through the sight and adjust the gimbal so that the aiming light target of the aligned cascade laser communication device or uplink laser communication access device is in the middle of the image in the sight.

[0065] 4. (404) The control unit controls the switching unit to complete the connection between the control unit and the laser communication unit.

[0066] 5. (405) Adjust the calibration unit pan / tilt of the aligned cascade laser communication device or the uplink laser communication access device so that all visible laser spots emitted by the downlink laser communication access device enter the paired aiming laser target.

[0067] 6. (406) The control unit controls the laser communication unit to periodically send a test laser communication signal, and at the same time receives a test laser communication signal periodically sent by a paired cascade laser communication device or an uplink laser communication access device.

[0068] 7. (407) If both paired parties receive the complete test laser communication signal within the set time, execute (407), otherwise return to execute (405).

[0069] 8. (408) Laser communication signals sent by both parties of the laser communication pair to confirm the connection.

[0070] 9. (409) The control unit controls the switching unit to complete the connection between the communication unit and the laser communication unit.

[0071] Fig. 9This is a flow chart of the connection process of the cascade laser communication device. For the sake of simplicity and accuracy, the specific steps are as follows:

[0072] 1. (501) The control unit controls the switching unit to complete the connection between the control unit and the laser communication unit for uplink communication.

[0073] 2. (502) Adjust the calibration unit pan / tilt head so that all visible laser spots emitted by the downlink laser communication access device or the upper-level cascade laser communication device enter the paired aiming laser target.

[0074] 3. (503) The control unit controls the laser communication unit of the uplink communication to periodically send a test laser communication signal, and at the same time receives the test laser communication signal periodically sent by the downlink laser communication access device or the upper-level cascade laser communication device.

[0075] 4. (504) If both paired parties receive the complete test laser communication signal within the set time, execute (505), otherwise return to execute (502).

[0076] 5. (505) Laser communication signals for connection confirmation sent between the laser communication pairing parties of the uplink communication.

[0077] 6. (506) The control unit controls the switching unit to complete the connection between the control unit and the laser communication unit for downlink communication.

[0078] 7. (507) Observe the aiming light target through the sight and adjust the pan / tilt of the aiming unit so that the aiming light target of the aligned uplink laser communication access device or the next-level cascade laser communication device is in the middle of the image in the sight.

[0079] 8. (508) Adjust the calibration unit pan / tilt of the aligned uplink laser communication access device or the next-level cascade laser communication device so that all visible laser spots emitted by the aiming unit enter the paired aiming laser target.

[0080] 9. (509) The control unit controls the laser communication unit of the downlink communication to periodically send a test laser communication signal, and at the same time receives the test laser communication signal periodically sent by the paired uplink laser communication access device or the next-level cascade laser communication device.

[0081] 10. (510) If both paired parties receive the complete test laser communication signal within the set time, execute (511), otherwise return to execute (508).

[0082] 11. (511) Laser communication signals sent by both laser communication partners in downlink communication to confirm the connection.

[0083] 12.(512) The control unit controls the switching unit to complete the connection between the laser communication unit for uplink communication and the laser communication unit for downlink communication.

[0084] During the device pairing and connection process of laser communication, the downlink aiming process of the upper-level device and the uplink calibration process of the lower-level device are operated in the same time period to achieve connection.

Claims

1. Mine emergency communication system, characterized by: The mine emergency communication system includes at least one network management device, at least one downlink laser communication access device, at least one uplink laser communication access device, at least one wireless communication access device, and at least one wireless terminal device; the system further includes a cascade laser communication device; the network management device is deployed above the mine, and the network management device is used to establish a communication network and is responsible for the management and data exchange of all devices accessing the network; a downlink laser communication access device is deployed at the mine entrance or the tunnel entrance, the network management device is connected to the downlink laser communication access device for communication via a communication cable, the downlink laser communication access device is connected to the uplink laser communication access device for communication via laser wireless communication, and the uplink laser communication access device is connected to the wireless communication access device for communication via a communication cable; the wireless communication access device is connected to the wireless terminal device underground via wireless communication, and provides wireless access and communication services with the network management device for the wireless terminal device; when the downlink laser communication access device and the uplink laser communication access device cannot communicate directly, one or more of the cascade laser communication devices are deployed along the mine tunnel to provide laser communication relay services.

2. The mine emergency communication system according to claim 1, characterized in that: The downlink laser communication access device includes a control unit, a communication unit, a switching unit, a laser communication unit, a human-computer interaction unit, an aiming unit, and a power supply unit; the switching unit is controlled by the control unit to complete the switching between the three connection states of the control unit and the communication unit, the control unit and the laser communication unit, and the communication unit and the laser communication unit; the aiming unit is used to align with the calibration unit of the uplink laser communication access device or the cascade laser communication device to ensure the laser communication between the laser communication units of the two devices; the aiming unit includes an aiming laser, a sight, and a gimbal; the aiming laser emits visible laser, which can produce a light spot on the aiming laser target of the paired calibration unit; the sight adopts a monocular telescope, which is used to remotely observe the aiming light target of the paired calibration unit; the gimbal can be adjusted in three axes to adjust the angle of the aiming unit.

3. The mine emergency communication system according to claim 1, characterized in that: The uplink laser communication access device includes a control unit, a communication unit, a switching unit, a laser communication unit, a human-computer interaction unit, a calibration unit, and a power supply unit; the switching unit is controlled by the control unit to complete the switching between three connection states: the control unit and the communication unit, the control unit and the laser communication unit, and the communication unit and the laser communication unit; the calibration unit is used to align with the calibration unit of the uplink laser communication access device or the cascade laser communication device to ensure laser communication between the laser communication units of the two devices; the calibration unit includes an aiming laser, a sight, and a gimbal; the aiming laser emits visible laser, which can produce a light spot on the aiming laser target of the paired calibration unit; the sight adopts a monocular telescope, which is used to remotely observe the aiming light target of the paired calibration unit; the gimbal can be adjusted in three axes to adjust the angle of the aiming unit.

4. The mine emergency communication system according to claim 1, characterized in that: The cascade laser communication device includes a control unit, a switching unit, two laser communication units, a human-computer interaction unit, a calibration unit, an aiming unit, and a power supply unit; the switching unit is controlled by the control unit to complete the switching between three connection states: the control unit and the downstream laser communication unit, the control unit and the upstream laser communication unit, and the downstream laser communication unit and the upstream laser communication unit. ; The calibration unit is used to align and match with the calibration unit of the uplink laser communication access device or the cascade laser communication device to ensure laser communication between the laser communication units of the two devices; the calibration unit includes an aiming laser, a sight, and a pan-tilt head; the aiming laser emits visible laser, which can produce a light spot on the aiming laser target of the paired calibration unit; the sight adopts a monocular telescope for remote observation of the aiming light target of the paired calibration unit; the pan-tilt head can be adjusted in three axes to adjust the angle of the aiming unit; the aiming unit is used to align and match with the calibration unit of the uplink laser communication access device or the cascade laser communication device to ensure laser communication between the laser communication units of the two devices; the aiming unit includes an aiming laser, a sight, and a pan-tilt head; the aiming laser emits visible laser, which can produce a light spot on the aiming laser target of the paired calibration unit; the sight adopts a monocular telescope for remote observation of the aiming light target of the paired calibration unit; the pan-tilt head can be adjusted in three axes to adjust the angle of the aiming unit.

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