Mine emergency communication system

Abstract

The application provides a mine emergency communication system, which comprises a network management device, a downlink laser communication access device, a cascaded laser communication device, an uplink laser communication access device and the like; the network management device is used for establishing a communication network; the downlink laser communication access device communicates with the uplink laser communication access device through a laser wireless mode under the relay support of the cascaded laser communication device, so as to establish a laser wireless backbone communication link and provide a communication service for a downhole wireless terminal device. The system has the advantages of a high bandwidth of a wired communication system and the advantages of easy deployment of a wireless multi-hop network communication system, solves the problems of low bandwidth and short distance of an existing wireless multi-hop network emergency communication system, can be widely applied to coal mines and non-coal mines, improves a mine emergency communication technical level, improves a mine disaster rescue efficiency, reduces personnel casualty and property loss and the like, and has important application value.

Description

Technical Field

[0001] The present 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] Existing underground communication systems primarily include wired dispatch communication systems, mobile communication systems, broadcast communication systems, through-the-ground communication systems, and disaster relief communication systems. These systems all utilize communication cables, powered by local power supply equipment. Existing underground communication and power cables are typically installed along tunnel walls. These cables are easily damaged by accidents such as coal and gas outbursts, gas explosions, rock bursts, roof falls, floods, and fires. Consequently, these communication systems are susceptible to disruptions and cannot function properly. Through-the-ground communication systems, based on low-frequency through-the-ground communication technology, offer minimal impact and strong disaster resilience, but they require large transmitting antennas. Through-the-ground communication typically utilizes a one-way broadcast communication method, meaning underground personnel can only receive information from above, not send it. Transmitters are only available in a limited number of underground chambers. After an accident, those above ground remain unable to learn about the situation of those not in these chambers. Therefore, existing through-the-ground communication systems cannot meet the emergency communication needs of mines. Disaster relief communication systems are carried by rescue team members, making communication impossible in locations beyond the reach of rescuers. Existing underground disaster relief communication systems often utilize wireless mesh communication systems, which enable dynamic self-organizing networks and possess excellent autonomous management and recovery capabilities. However, in practice, these systems suffer from limitations in the number of communication hops and bandwidth loss in multi-stage relays, resulting in low transmission bandwidth, high transmission latency, and poor overall system stability. To address these issues, a new emergency wireless communication system is needed to enhance the system's resilience to disasters and provide reliable communication services to underground rescuers after a mine disaster. 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, with 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 connected to 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, providing the wireless terminal device with wireless access and communication services with the network management device; when the downlink laser communication access device and the uplink laser communication access device cannot communicate directly, one or multiple 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 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.

[0005] 2. The mine emergency communication system further comprises: the uplink laser communication access device comprises 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 for pairing and collimating with the calibration unit of the uplink laser communication access device or the cascaded laser communication device to ensure the laser communication between the laser communication units of the two devices; the calibration unit comprises a collimating laser, a sighting scope and a pan-tilt head; the collimating laser emits visible laser to generate a light spot on the collimating laser target of the paired calibration unit; the sighting scope adopts a monocular telescope to remotely observe the collimating light target of the paired calibration unit; and the pan-tilt head can be adjusted in three axes to adjust the angle of the collimating unit.

[0006] 3. The mine emergency communication system further comprises: the cascaded laser communication device comprises a control unit, a switching unit, two laser communication units, a human-computer interaction unit, a calibration unit, a collimating 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 downlink laser communication unit, the control unit and the uplink laser communication unit, and the downlink laser communication unit and the uplink laser communication unit; the calibration unit is used for pairing and collimating with the calibration unit of the uplink laser communication access device or the cascaded laser communication device to ensure the laser communication between the laser communication units of the two devices; the calibration unit comprises a collimating laser, a sighting scope and a pan-tilt head; the collimating laser emits visible laser to generate a light spot on the collimating laser target of the paired calibration unit; the sighting scope adopts a monocular telescope to remotely observe the collimating light target of the paired calibration unit; and the pan-tilt head can be adjusted in three axes to adjust the angle of the collimating unit; the collimating unit is used for pairing and collimating with the calibration unit of the uplink laser communication access device or the cascaded laser communication device to ensure the laser communication between the laser communication units of the two devices; the collimating unit comprises a collimating laser, a sighting scope and a pan-tilt head; the collimating laser emits visible laser to generate a light spot on the collimating laser target of the paired calibration unit; the sighting scope adopts a monocular telescope to remotely observe the collimating light target of the paired calibration unit; and the pan-tilt head can be adjusted in three axes to adjust the angle of the collimating 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 direct photoelectric 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 the advantages of easy deployment of wireless multi-hop network communication systems, solving the problems of low transmission bandwidth, high transmission delay, short transmission distance and other problems existing in 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 level of mine emergency communication technology, 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] Figure 9 Flowchart of the connection process of cascade laser communication devices. DETAILED DESCRIPTION

[0017] The following will be combined with the accompanying 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 efforts 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 an emergency communication vehicle and is used to establish an emergency communication network. The emergency communication network is connected to the core switch (107) of the mine's existing mining Ethernet network and can communicate with all devices connected to the mining Ethernet network that can communicate normally. The emergency communication network is connected to a communication satellite (110) via a satellite antenna to achieve long-distance satellite communication. Emergency communication networks include but are not limited to mobile communication networks, dedicated Ethernet networks, the Internet, etc.

[0020] 2. Downlink laser communication access device (102), responsible for converting the communication signal transmitted from the network management device (101) via the communication cable into a laser signal for downlink transmission, and is also responsible for receiving the uplink laser signal and transmitting it to the network management device via 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 via laser wireless communication. The detailed functional structure of the downlink laser communication access device is in Figure 4 and detailed description thereof.

[0021] 3. Cascade laser communication device (103), responsible for transmitting laser signals and changing the propagation direction of laser to realize laser communication relay. In this embodiment, a cascade laser communication device is deployed in the lane to relay laser communication 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 in Figure 6 and detailed description thereof.

[0022] 4. Uplink laser communication access device (104), responsible for converting the communication signal transmitted from 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 in Figure 5 and detailed description thereof.

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

[0024] The wireless communication standards of the wireless communication access equipment may adopt 2G, 3G, 4G, 5G mobile communications, Wifi or WSN, etc.

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

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

[0027] 8. Monitoring terminal (108), a terminal device used for mine communication, monitoring, surveillance, and 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. Satellite communication base station (111), used for connecting to communication satellites.

[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 command of the mine.

[0035] 3. The downlink laser communication access device (102) is deployed at the mine entrance and 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 3 of the emergency communication system is shown in Figure 3 The main difference between embodiment 3 and embodiment 2 is that the downlink laser communication access device (102) is deployed at the entrance of the underground roadway, and the uplink laser communication access device (104) is directly connected through laser wireless communication.

[0037] The functional structure of the downlink laser communication access device is shown in Figure 4 It mainly includes:

[0038] 1. Control unit (201), responsible for the functional control of all components of the man-machine interaction unit (205) to realize man-machine interaction, 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 STM32H7 series processor, which belongs to The processor has a running frequency of up to 480MHz, including USB OTG, Ethernet and SDMMC high-speed interfaces and I2C, SPI, UART, CAN communication interfaces, and the Ethernet interface is connected with the switching unit to realize the communication switching between the communication unit and the control unit / laser communication unit through the switching unit.

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

[0040] 3. Switching unit (203), controlled by the control unit (201), to complete the switching between 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 and 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. 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. The core component can be MAX3669 produced by MAXIM; the transmitting module includes a laser diode, an insulation protector and a collimator. The laser diode can be LP650P007 produced by THORLABS, the insulation protector can be SRA9A, and the collimator can be LTN300-A. The receiving part consists of a receiving module, a signal amplifying circuit, and a receiving signal processing circuit; the receiving module includes a lens and a photosensor, and the photosensor is responsible for receiving laser light and converting it into an electrical signal. The PDA36A photodetector from THORLABS can be selected; the signal amplifying circuit is used to amplify the weak electrical signal output by the photosensor, and the core component can be the low-noise amplifier OPA657 from 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. 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 operator (rescue personnel) of the equipment to perform operations such as function settings, and is also called a human-machine interface. The human-machine interaction unit consists of a display screen, indicator lights, a buzzer, and buttons. The display screen uses an LCD screen to display the equipment status, and an LCD screen with a touch function can be used; the indicator lights use LEDs; the buzzer is used to provide an audible indication of the status; and the buttons are used for manual operation of the equipment, 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. A sighting 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 sighting unit includes a sighting laser, a sighting mirror, and a pan / tilt platform. The sighting laser emits visible laser light and can produce a light spot on the sighting laser target of the paired calibration unit. The sighting mirror is a monocular telescope used for remote observation of the sighting light target of the paired calibration unit. The pan / tilt platform can be adjusted in three axes to adjust the angle of the sighting unit.

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

[0047] 2. A calibration unit (208), the calibration unit 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 sight 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). The cascade laser communication device includes 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. It has both a calibration unit (208) and an aiming unit (206), 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 also 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 or downlink laser communication access device of the next level; 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 conjunction 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. In this embodiment, the sight is located at the center of the equilateral triangle formed by the aiming laser (301).

[0058] 6. A platform (305) is used to adjust the angle of the aiming unit or calibration unit. In this embodiment, the platform adopts a mechanical platform 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. Aiming light target (307), which is a component of the calibration unit, is used to provide a light source target for the sight of the paired sighting unit, and adopts 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, step (403) is executed, otherwise the process returns to (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 the paired cascade laser communication device or the 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 in 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] Figure 9This is a flowchart of the cascade laser communication device connection process. For the sake of brevity 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 table 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 sent by both laser communication pairs in uplink communication to confirm the connection.

[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 downlink laser communication unit 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 parties of the laser communication pair for downlink communication to confirm the connection.

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

[0084] In the device pairing connection process of the laser communication, the downlink aiming of the previous device and the uplink calibration of the next device are operated in the same time period to cooperate to achieve the 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, responsible for the management and data exchange of all devices connected to 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, providing wireless access and communication services with the network management device for the wireless terminal device; the downlink laser communication access device is connected to the uplink laser communication access device for communication via a laser wireless communication method, 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, providing wireless access and communication services with the network management device for the wireless terminal device; When the downlink laser communication access device cannot communicate directly, one or multiple cascade laser communication devices are deployed along the mine tunnel to provide laser communication relay services; 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 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.

2. 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 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; the calibration unit 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 platform; 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 sight of the paired aiming unit, and adopts an LED light-emitting element; the pan-tilt platform can be adjusted in three axes to adjust the angle of the calibration unit.

3. The mine emergency communication system according to claim 1, wherein: 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 of the control unit and the downlink laser communication unit, the control unit and the uplink laser communication unit, and the downlink laser communication unit and the uplink laser communication unit; the calibration unit is used to align with the aiming unit of the downlink laser communication access device or the upper-level 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 aiming light of the paired aiming unit. The light spot of visible laser emitted by the aiming laser; the aiming light target is used to provide a light source target for the sight of the paired aiming unit, and adopts LED light-emitting elements; the pan-tilt can be adjusted in three axes to adjust the angle of the calibration unit; the aiming unit is used to align with the calibration unit of the next-level cascade laser communication device or the uplink laser communication access device; the aiming unit includes an aiming laser, a sight, and a pan-tilt; 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 pan-tilt can be adjusted in three axes to adjust the angle of the aiming unit.

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