Through-the-earth mobile communication method and system based on quantum precision measurement

Abstract

The invention relates to the technical field of quantum precision measurement and communication, and discloses a through-the-earth mobile communication method and system based on quantum precision measurement, and the system comprises a ground platform, a plurality of underground relay stations, and a plurality of underground mobile stations. The ground platform comprises a first through-the-earth communication module and a ground control unit; the underground relay station comprises a second through-the-earth communication module, a first underground control unit and a first wireless transceiver module; the underground mobile station comprises a third through-the-earth communication module, a second underground control unit and a second wireless transceiver module; a long-range through-the-earth communication link is arranged between the ground station and the underground relay station; two links are arranged between the underground relay station and the underground mobile station, and comprise a conventional wireless mobile communication link and a short-range cross-medium through-the-earth mobile communication link; in addition, a long-range through-the-earth emergency link is established between the ground station and the underground mobile station. According to the invention, the distance of through-the-earth communication can be obviously increased under the same power, and the mobile adaptability and reliability of communication in underground or closed space can be improved.

Description

Technical Field

[0001] The present invention relates to the field of quantum precision measurement and communication technology, and in particular to a method and system for through-the-ground mobile communication based on quantum precision measurement, which performs through-the-ground mobile communication through weak magnetic field detection and can be used to complete cross-medium and confined space emergency communication. Background Art

[0002] Traditional wireless communication and mobile communication use the characteristics of electromagnetic wave signals propagating in free space to exchange information, mainly using low-loss air as the transmission medium. The current technical route uses higher-frequency carriers to expand channel bandwidth, increase information transmission bandwidth, and improve information transmission quality. However, challenges faced by such technical solutions have always existed. With the increase of carrier operating frequency, the influence of factors such as multipath effect and path transmission loss has become more obvious, becoming the main factor restricting high-frequency wireless communication from increasing transmission distance and improving transmission quality.

[0003] Through-the-ground communication uses the earth as the main transmission medium. The rock, soil, water and other media in the ground will cause serious signal attenuation to the common wireless communication electromagnetic waves, resulting in serious transmission loss. The disordered spatial distribution and density distribution of different components such as rocks, soil and water in the underground space cause the traditional communication electromagnetic waves to experience more reflection, transmission and diffraction when propagating through the ground. The multipath effect of wireless through-the-ground communication channels is more complicated than that of air media. For the application scenarios of through-the-ground communication, in order to meet the most important demand of increasing the transmission distance, it is necessary to specially select low-frequency long-wavelength magnetic field carriers to reduce transmission losses and eliminate multipath effects.

[0004] The current through-the-ground communication scheme uses electromagnetic induction between magnetic field coils or electrodes to transmit low-frequency magnetic field signals. Under limited power consumption, it has high requirements on the geometric alignment relationship between the transmitter and the receiver, which limits the environmental adaptability of the through-the-ground communication system and its flexibility for mobile communications and mobile terminals. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems existing in the current underground mobile communication technology, such as poor mobile adaptability, limited transmission distance, low sensitivity, high equipment power consumption, etc., and provide an underground mobile communication method and system based on quantum precision measurement. A communication signal receiving end is constructed based on an atomic magnetometer to perform underground mobile communication, so as to adapt to the environmental adaptability requirements of complex media and narrow space, and ensure reliable underground mobile communication and emergency communication.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a through-the-ground mobile communication system based on quantum precision measurement, comprising a ground station, multiple underground relay stations and multiple underground mobile stations;

[0007] The ground station is arranged on the ground, and includes a first through-the-ground communication module and a ground control unit; the underground relay station is arranged underground, and includes a second through-the-ground communication module, a first underground control unit and a first wireless transceiver module; the underground mobile station is arranged underground, and includes a third through-the-ground communication module, a second underground control unit and a second wireless transceiver module;

[0008] The ground station is connected to the underground relay station and the underground mobile station through the first through-the-ground communication module; the underground relay station is connected to the ground station through the second through-the-ground communication module, and is connected to the underground mobile station through the second through-the-ground communication module; the underground mobile station is connected to the ground station and the underground relay station through the third through-the-ground communication module, forming a through-the-ground communication link;

[0009] The first through-the-earth communication module includes a first atomic magnetometer receiving module and a ground magnetic field transmitting module. The first atomic magnetometer receiving module is used to receive the low-frequency magnetic field long-distance through-the-earth communication signal sent by the transmitting end of the second through-the-earth communication module and transmit it to the ground control unit. The ground magnetic field transmitting module is used to transmit the communication signal processed by the ground control unit through a low-frequency magnetic field carrier.

[0010] The second through-the-earth communication module and the third through-the-earth communication module each include a second atomic magnetometer receiving module and an underground magnetic field transmitting module;

[0011] In the second through-the-earth communication module, the second atomic magnetometer receiving module is used to receive the low-frequency magnetic field long-range through-the-earth communication signal sent by the first through-the-earth communication module, and is also used to receive the low-frequency magnetic field short-range through-the-earth communication signal sent by the third through-the-earth communication module, and the underground magnetic field transmitting module is used to transmit the communication signal processed by the first underground control unit through the low-frequency magnetic field carrier;

[0012] In the third through-the-earth communication module, the second atomic magnetometer receiving module is used to receive the low-frequency magnetic field long-range through-the-earth communication signal sent by the transmitting end of the first through-the-earth communication module or the low-frequency magnetic field short-range through-the-earth communication signal sent by the transmitting end of the second through-the-earth communication module, and the underground magnetic field transmitting module is used to transmit the communication signal processed by the second underground control unit through the low-frequency magnetic field carrier;

[0013] The first wireless transceiver module and the second wireless transceiver module are used to establish a conventional wireless mobile communication link between the underground relay station and the underground mobile station.

[0014] The first atomic magnetometer receiving module and the second atomic magnetometer receiving module are three-axis atomic magnetometers or two-axis atomic magnetometers.

[0015] In the first through-the-earth communication module, the second through-the-earth communication module and the third through-the-earth communication module, the atomic magnetometer uses multi-axis synchronous detection to realize orthogonal polarization signal differential and redundant detection modes.

[0016] The first wireless transceiver module and the second wireless transceiver module respectively include one or more of a 4G communication module, a 5G communication module, a WIFI communication module, a Bluetooth communication module or a ZigBee communication module.

[0017] The first through-the-earth communication module also includes a first baseband signal processor and a ground power amplifier; the first baseband signal processor is connected to the ground control unit, the first atomic magnetometer receiving module and the ground power amplifier, and the ground power amplifier is connected to the ground magnetic field transmitting module; the communication signal processed by the ground control unit is modulated by the first baseband signal processor, amplified by the ground power amplifier, and then sent by the ground magnetic field transmitting module, and the signal received by the first atomic magnetometer receiving module is demodulated by the first baseband signal processor and sent to the ground control unit.

[0018] The second through-the-earth communication module also includes an underground baseband signal processor and an underground power amplifier. In the second through-the-earth communication module, the underground baseband signal processor is connected to the underground control unit, the second atomic magnetometer receiving module and the underground power amplifier, and the underground power amplifier is connected to the underground magnetic field transmitting module; the output signal of the underground control unit is modulated by the underground baseband signal processor, amplified by the underground power amplifier and then sent by the underground magnetic field transmitting module, the signal received by the second atomic magnetometer receiving module is demodulated by the underground baseband signal processor and sent to the underground control unit, and the first wireless transceiver module is respectively connected to the first underground control unit through the underground baseband signal processor.

[0019] The underground relay station and underground mobile station serving as underground terminals also include backup batteries.

[0020] The above-ground magnetic field transmitting module and the underground magnetic field transmitting module are magnetic field generating coils or magnetic field generating electrodes.

[0021] In addition, the present invention also provides a method for through-the-ground mobile communication based on quantum precision measurement, which is implemented based on the system described above and includes the following steps: in a conventional communication mode, long-range through-the-ground duplex communication is implemented between a ground station and an underground relay station, the ground station sends a signal to the underground relay station, the underground relay station receives the signal and forwards it to the underground mobile station, the underground mobile station sends a signal to the underground relay station, and the underground relay station forwards the signal to the ground station via a long-range through-the-ground link; specifically, the uplink is: on the one hand, the underground mobile station can send a signal through the second wireless transceiver module, and the underground relay station receives the signal through the first wireless transceiver module, forming an underground conventional wireless mobile communication uplink; on the other hand, the underground mobile station can send a short-range through-the-ground signal through the third through-the-ground communication module , the underground relay station receives the signal through the second underground through-the-ground module to form an underground short-range cross-medium through-the-ground mobile communication uplink; then the signal is forwarded through the second through-the-ground communication module of the underground relay station, and the ground station receives the signal through the first through-the-ground communication module; the downlink is: the ground station sends the signal to the long-range through-the-ground link through the first through-the-ground communication module, the underground relay station receives the signal through the second through-the-ground communication module and forwards it to the conventional wireless mobile communication downlink through the first wireless transceiver module, or forwards it to the short-range cross-medium through-the-ground mobile communication downlink through the second through-the-ground communication module, the underground mobile station receives the signal from the conventional wireless mobile communication downlink through the second wireless transceiver module, or receives the signal from the short-range cross-medium through-the-ground mobile communication downlink through the third through-the-ground communication module;

[0022] In the emergency communication mode, the ground station directly sends emergency information and rescue instructions to the underground mobile station via the first through-the-ground communication module via the long-range through-the-ground communication downlink. The underground mobile station receives signals from the long-range through-the-ground communication downlink via the third through-the-ground communication module to complete the broadcasting and reception of emergency information.

[0023] There are two types of underground mobile communication links, namely short-range cross-medium through-the-ground mobile communication links and conventional wireless mobile communication links; the underground mobile station sends signals to the short-range cross-medium through-the-ground mobile communication link through the third through-the-ground communication module, the underground relay station receives signals from the short-range cross-medium through-the-ground mobile communication link through the second through-the-ground communication module, the underground relay station sends signals to the short-range cross-medium through-the-ground mobile communication link through the second through-the-ground communication module, the underground mobile station receives signals from the short-range cross-medium through-the-ground mobile communication link through the third through-the-ground communication module, and underground short-range cross-medium through-the-ground duplex mobile communication is realized; the underground mobile station sends signals to the conventional wireless mobile communication link through the second wireless transceiver module, the underground relay station receives signals from the conventional wireless mobile communication link through the first wireless transceiver module, the underground relay station sends signals to the conventional wireless mobile communication link through the first wireless transceiver module, the underground mobile station receives signals from the conventional wireless mobile communication link through the second wireless transceiver module, and underground conventional wireless duplex mobile communication is realized.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. In the present invention, the through-the-ground communication module uses a three-axis or two-axis atomic magnetometer as the receiving end, and its measurement bandwidth is in the range of kHz to MHz, which is consistent with the requirements of low-frequency magnetic induction communication. For the measurement of low-frequency magnetic field communication signals within the bandwidth, it has ultra-high sensitivity, which can reach fT / √Hz. Under the same transmission power, the distance of through-the-ground mobile communication can be increased to 5-10 times that of the existing traditional solutions;

[0026] 2. The present invention can achieve high-sensitivity reception of analog or digitally modulated through-the-ground communication signals, and realize differential and redundant detection modes through two orthogonal polarization signal channels, thereby improving the signal-to-noise ratio in the process of demodulation and processing of weak signals, improving the anti-interference ability of the system, and greatly reducing the dependence of the traditional through-the-ground communication scheme using induction coils or induction electrodes on the alignment relationship between the transmitting and receiving units.

[0027] 3. In the present invention, in the normal mode, the normally operating underground relay station and underground mobile station constitute an underground mobile communication system with cross-medium wireless duplex mobile communication and positioning functions; in the emergency mode, the ground station can directly build a through-the-ground broadcast channel for the underground mobile stations within the effective receiving range, and perform through-the-ground transmission and release of key emergency information when the system working environment deteriorates or in an emergency state.

[0028] When working in the normal mode, the ground station and the underground relay station form a long-range through-the-ground communication link. The underground mobile station can build a duplex communication link with the ground station through the underground relay station. The ground station realizes communication and positioning by processing the interactive signals between multiple underground relay stations that are working normally within the effective receiving range and the target mobile station. The underground relay station and the underground mobile station are located underground. On the one hand, the air can be used as the transmission medium, and different wireless communication protocols such as 4G, 5G, WIFI, Bluetooth, ZigBee technology can be selected to realize conventional wireless duplex mobile communication and positioning functions. On the other hand, if the underground conventional wireless mobile communication link is blocked, the user activity space of the underground mobile station is limited or blocked by the stratum, the underground relay station and the underground mobile station can start a short-range cross-medium through-the-ground mobile communication link using the receiving technology based on the magnetic field quantum precision measurement. The underground relay station and the underground mobile station can complete low-energy short-range cross-medium through-the-ground wireless duplex mobile communication. Similarly, the positioning function of the underground mobile station in a restricted environment can be realized based on the cooperation and identity recognition of multiple underground relay stations, thereby forming a cross-medium mobile communication system.

[0029] In summary, the present invention provides a method and system for through-the-ground mobile communication based on quantum precision measurement. On the one hand, through-the-ground communication is achieved based on quantum precision measurement of low-frequency magnetic fields, which can significantly increase the distance of through-the-ground communication at the same power. On the other hand, it can well solve the problem of limited geometric alignment relationship between the transmitting and receiving ends in traditional through-the-ground communication schemes, enhance the mobile adaptability of the user end, build an underground cross-medium mobile communication system, greatly improve the reliability of communication underground or in confined spaces, and can also broadcast and release emergency information through the ground in emergency mode, thereby improving the survival rate of trapped persons after an accident and providing strong protection for the life safety of rescue personnel and trapped persons. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A structural diagram of a through-the-earth mobile communication system based on quantum precision measurement provided in Embodiment 1 of the present invention;

[0031] Figure 2 A structural relationship diagram of a through-the-earth mobile communication system based on quantum precision measurement provided in Embodiment 1 of the present invention;

[0032] Figure 3 This is a diagram showing the architecture of a signal transmission and reception system of a ground station in Embodiment 1 of the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of an underground relay station in Embodiment 1 of the present invention;

[0034] Figure 5 This is a schematic diagram of communication between a ground station and an underground mobile station in a conventional communication mode in Embodiment 2 of the present invention;

[0035] Figure 6 This is a schematic diagram of communication between a ground station and an underground mobile station in an emergency communication mode in Embodiment 2 of the present invention;

[0036] Figure 7 This is a schematic diagram of underground duplex mobile communication between an underground relay station and an underground mobile station in Embodiment 2 of the present invention;

[0037] In the figure: 1-ground station, 2-underground relay station, 3-underground mobile station, 4-first atomic magnetometer receiving module, 5-first baseband signal processor, 6-ground control unit, 7-ground power amplifier, 8-ground magnetic field transmitting module, 9-second atomic magnetometer receiving module, 10-underground baseband signal processor, 11-underground control unit, 12-underground power amplifier, 13-underground magnetic field transmitting module, 14-first wireless transceiver module. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] Embodiment 1

[0040] Embodiment 1 of the present invention provides a ground-penetrating mobile communication system based on quantum precision measurement, using a three-axis or two-axis atomic magnetometer as a receiving end sensor to achieve low-frequency and long-distance ground-penetrating mobile communication. The system can solve the problems of poor mobility adaptability, limited transmission distance, low sensitivity, high equipment power consumption, etc. in existing ground-penetrating communication technologies, and at the same time start corresponding communication modes according to different degrees of damage to the communication link. In the process of system application practice, it can continuously optimize channel performance, transmission reliability, and timeliness in the face of different transmission media.

[0041] Specifically, Figure 1 As shown, a through-the-ground mobile communication system based on quantum precision measurement in this embodiment includes two types of underground terminals consisting of a ground station 1, multiple underground relay stations 2 and multiple underground mobile stations 3. The ground station 1 is set on the ground, and the underground relay stations 2 and underground mobile stations 3 are set underground. The ground station 1 is used as a ground device to send signals to multiple underground relay stations 2 or underground mobile stations 3 through a downlink through-the-ground link, and directly receive signals sent by multiple underground relay stations 2 in an uplink through-the-ground link to complete the through-the-ground duplex communication between the underground terminal and the ground station 1; the underground relay station 2 has the function of receiving and forwarding signals, and can perform through-the-ground duplex communication with the ground station 1, and can also perform short-range cross-medium through-the-ground mobile communication and conventional wireless duplex mobile communication with the underground mobile station 3; the underground mobile station 3 can perform through-the-ground duplex communication with the ground station 1 with the help of the underground relay station 2. Crucially, when the direct conventional wireless mobile communication link between the underground relay station 2 and the underground mobile station 3 is blocked, a short-range cross-medium through-the-ground mobile communication link can be enabled to realize cross-medium duplex mobile communication; in particular, when the system is more seriously damaged, even if the underground relay station 2 is disabled, the underground mobile station 3 can still directly receive the emergency information of the ground station 1 through the downlink emergency through-the-ground link, and complete the broadcast release and reception of the emergency information.

[0042] There is a long-distance through-the-ground communication link between the ground station 1 and the underground relay station 2, which is connected by the first through-the-ground communication module and the second through-the-ground communication module; there are two links between the underground relay station 2 and the underground mobile station 3, in which the first wireless transceiver module 14 and the second wireless transceiver module are used to establish a conventional wireless mobile communication link, and the second through-the-ground communication module and the third through-the-ground communication module are used to establish a short-distance cross-medium through-the-ground mobile communication link; in addition, the first through-the-ground communication module and the third through-the-ground communication module are used to establish a long-distance through-the-ground emergency link between the ground station 1 and the underground mobile station 3. The present invention realizes through-the-ground communication across media based on quantum precision measurement of low-frequency magnetic fields, which can significantly increase the distance of through-the-ground communication at the same power, and improve the mobile adaptability and reliability of communication in underground or confined spaces.

[0043] Specifically, Figure 2 As shown, in this embodiment, the ground station 1 includes a first through-the-ground communication module and a ground control unit; the underground relay station 2 is distributed underground, including a second through-the-ground communication module, a first underground control unit and a first wireless transceiver module 14; the underground mobile station 3 is distributed underground, including a third through-the-ground communication module, a second underground control unit and a second wireless transceiver module; the ground station 1 is connected to the underground relay station 2 and the underground mobile station 3 through the first through-the-ground communication module. In particular, on the one hand, the underground relay station 2 is connected to the ground station 1 through the second through-the-ground communication module, and is connected to the underground mobile station 3 through the second through-the-ground communication module. The underground mobile station 3 is connected to the underground relay station 2 through the third through-the-ground communication module for communication relay, and then establishes a communication connection with the ground station 1, forming a through-the-ground mobile communication link; on the other hand, the underground relay station 2 is connected to the first wireless transceiver module 14, and the underground mobile station 3 is connected to the second wireless transceiver module, forming a conventional wireless mobile communication link, and realizing conventional wireless mobile communication between underground terminals. Thus, a cross-medium through-the-ground mobile communication system is constructed as a whole.

[0044] Specifically, Figure 3 As shown, in this embodiment, the first through-the-earth communication module of the ground station 1 system includes a first atomic magnetometer receiving module 4 and a ground magnetic field transmitting module 8. The first atomic magnetometer receiving module 4 serves as a receiving end to receive a low-frequency magnetic field long-range through-the-earth communication signal sent from a transmitting end of the second through-the-earth communication module in the underground relay station 2 and transmits it to the ground control unit 6. The ground magnetic field transmitting module 8 serves as a transmitting end to transmit the communication signal processed by the ground control unit 6 through a low-frequency magnetic field carrier to form a long-range through-the-earth communication link.

[0045] The second through-the-earth communication module and the third through-the-earth communication module have the same structure, and both include a second atomic magnetometer receiving module 9 and an underground magnetic field transmitting module 13. The second atomic magnetometer receiving module 9, as a receiving end, can receive a low-frequency magnetic field long-range through-the-earth communication signal sent by the transmitting end of the first through-the-earth communication module, and can also receive a low-frequency magnetic field short-range through-the-earth communication signal sent by the underground magnetic field transmitting module 13 of the corresponding underground terminal.

[0046] Specifically, in this embodiment, the first atomic magnetometer receiving module 4 and the second atomic magnetometer receiving module 9 are three-axis atomic magnetometers or two-axis atomic magnetometers. In this embodiment, the first atomic magnetometer receiving module 4 and the second atomic magnetometer receiving module 9 have two technical routes, which are convenient for the detection of the dual-polarization transmission mode of the magnetic field signal and the analysis and noise suppression processing of the magnetic field vector signal; one is to use two sets of two-axis atomic magnetometers, and the number of sensitive axes of the magnetometers is redundant; the other is a three-axis atomic magnetometer, which measures the magnetic field vector from the three directions of x, y, and z to obtain effective signals and improve the signal-to-noise ratio. Compared with traditional through-the-ground communication, the advantages of the above two methods are mainly reflected in getting rid of the dependence of the transmitting and receiving ends on the geometric alignment relationship, and increasing the mobile adaptability of the through-the-ground communication system.

[0047] Specifically, in this embodiment, in the first through-the-earth communication module, the second through-the-earth communication module and the third through-the-earth communication module, the atomic magnetometer uses multi-axis synchronous detection to achieve orthogonal polarization signal differential and redundant detection mode.

[0048] Specifically, in this embodiment, the underground relay station 2 and the underground mobile station 3 can realize the short-range low-frequency magnetic induction through-the-ground mobile communication function through the second through-the-ground communication module and the third through-the-ground communication module, and can realize the conventional wireless mobile communication function through the first wireless transceiver module 14 and the second wireless transceiver module. Thus, the underground relay station 2 and the underground mobile station 3 can realize the reliable cross-medium wireless mobile duplex communication function in a confined space according to the needs.

[0049] Specifically, in this embodiment, the first wireless transceiver module 14 and the second wireless transceiver module respectively include one or more of a 4G communication module, a 5G communication module, a WIFI communication module, a Bluetooth communication module or a ZigBee communication module. The underground relay station 2 and the underground mobile station 3 have conventional wireless mobile communication functions based on different wireless communication protocols such as 4G, 5G, WIFI, Bluetooth or ZigBee technology.

[0050] Furthermore, if Figure 3As shown, in this embodiment, the first through-the-ground communication module also includes a first baseband signal processor 5 and a ground power amplifier 7; the first baseband signal processor 5 is connected to the ground control unit 6, the first atomic magnetometer receiving module 4 and the ground power amplifier 7, and the ground power amplifier 7 is connected to the ground magnetic field transmitting module 8; the output signal of the ground control unit 6 is modulated by the first baseband signal processor 5, amplified by the ground power amplifier 7 and then sent by the ground magnetic field transmitting module 8, and the signal received by the first atomic magnetometer receiving module 4 is demodulated by the first baseband signal processor 5 and sent to the ground control unit 6. In this embodiment, the signal received by the first atomic magnetometer receiving module 4 from the uplink long-distance through-the-ground link is demodulated by the first baseband signal processor 5 and transmitted to the ground control unit 6, and the information to be sent by the ground control unit 6 is modulated to the carrier by the first baseband signal processor 5 and enters the downlink long-distance through-the-ground link through the ground magnetic field transmitting module 8 after passing through the ground power amplifier 7.

[0051] Furthermore, if Figure 4 As shown, in this embodiment, the underground relay station 2 is configured with a second through-the-ground communication module, and its structure specifically includes an underground baseband signal processor 10 and an underground power amplifier 12. The underground baseband signal processor 10 is connected to the underground control unit 11, the second atomic magnetometer receiving module 9 and the underground power amplifier 12, and the underground power amplifier 12 is connected to the underground magnetic field transmitting module 13; the output signal of the underground control unit 11 is modulated by the underground baseband signal processor 10, amplified by the underground power amplifier 12, and then sent by the underground magnetic field transmitting module 13, the signal received by the second atomic magnetometer receiving module 9 is demodulated by the underground baseband signal processor 10 and sent to the underground control unit 11, and the first wireless transceiver module 14 is connected to the underground control unit 11 through the underground baseband signal processor 10.

[0052] In addition, in this embodiment, the underground mobile station 3 and the underground relay station 2 have substantially the same structure, and also include an underground baseband signal processor 10 and an underground power amplifier 12. The difference is that the transmission power of the second through-the-ground communication module in the underground relay station 2 is greater.

[0053] In this embodiment, the long-distance through-the-ground duplex communication between the underground relay station 2 and the ground station 1 requires that the underground relay station 2 has the same long-distance through-the-ground communication function as the ground station 1, while between the underground relay station 2 and the underground mobile station 3, efficient conventional wireless mobile communication is preferred. However, since the user space of the underground mobile station 3 is easily limited, the conventional wireless mobile communication link in the underground space is easily blocked. It is necessary to build a wireless mobile communication link capable of short-distance cross-medium through-the-ground between the underground relay station 2 and the nearby underground mobile station 3 on the basis of the conventional wireless mobile communication link to ensure reliable underground mobile duplex communication. Therefore, the architecture of the underground relay station 2 and the underground mobile station 3 needs to add a first wireless transceiver module 14 and a second wireless transceiver module to the signal transmission and signal reception links on the basis of the ground station 1 to realize through-the-ground communication to realize conventional wireless mobile communication functions. In addition, in this embodiment, the second through-the-ground communication module of the underground relay station 2 faces the ground station 1 for long-distance through-the-ground communication, and the third through-the-ground communication module of the underground mobile station 3 faces the underground relay station 2 for short-distance cross-medium through-the-ground mobile communication.

[0054] Specifically, in this embodiment, the underground relay station 2 and the underground mobile station 3 also include a backup battery. In addition, the underground mobile station 3 should meet the energy consumption and electromagnetic compatibility requirements of wearable devices.

[0055] The above-ground magnetic field transmitting module 8 and the underground magnetic field transmitting module 13 are magnetic field generating coils or magnetic field generating electrodes.

[0056] Embodiment 2

[0057] Embodiment 2 of the present invention provides a through-the-earth mobile communication method based on quantum precision measurement, which is implemented based on a through-the-earth mobile communication system based on quantum precision measurement described in Embodiment 1.

[0058] like Figure 5As shown, in the conventional communication mode, long-distance through-the-ground duplex communication is realized between the ground station 1 and the underground relay station 2. The ground station 1 sends the signal to the underground relay station 2 through the long-distance through-the-ground link. The underground relay station 2 receives the signal and forwards it to the underground mobile station 3. The underground mobile station 3 sends the signal to the underground relay station 2. The underground relay station 2 forwards the signal to the ground station 1 through the long-distance through-the-ground link. Specifically, the uplink is: on the one hand, the underground mobile station 3 can send signals through the second wireless transceiver module, and the underground relay station 2 receives the signals through the first wireless transceiver module 14, forming an underground conventional wireless mobile communication uplink; on the other hand, the underground mobile station 3 can send short-range through-the-ground signals through the third through-the-ground communication module, and the underground relay station 2 receives the signals through the second through-the-ground communication module, forming an underground short-range cross-medium through-the-ground mobile communication uplink; then the signal is forwarded through the second through-the-ground communication module of the underground relay station 2, and the ground station 1 receives the signal through the first through-the-ground communication module; the downlink is: the ground station 1 sends the signal down to the long-range through-the-ground link through the first through-the-ground communication module, the underground relay station 2 receives the signal through the second through-the-ground communication module and forwards it to the conventional wireless mobile communication downlink through the first wireless transceiver module 14, or forwards it to the short-range cross-medium through-the-ground mobile communication downlink through the second through-the-ground communication module, and the underground mobile station 3 receives the signal from the conventional wireless mobile communication downlink through the second wireless transceiver module, or receives the signal from the short-range cross-medium through-the-ground mobile communication downlink through the third through-the-ground communication module.

[0059] like Figure 6 As shown, in the emergency communication mode, when the underground relay system is completely disabled, that is, the duplex through-the-ground communication channel between the ground station 1 and the underground relay station 2, and between the underground relay station 2 and the underground mobile station 3 is damaged for some reason, the ground station 1 can directly send broadcast information to the underground mobile station 3 through the emergency channel. The ground station 1 sends emergency information and rescue instructions to the long-range through-the-ground communication downlink through the first through-the-ground communication module, and the underground mobile station 3 receives signals from the long-range through-the-ground communication downlink through the third through-the-ground communication module.

[0060] like Figure 7As shown, in this example, there are two types of underground mobile communication links between the underground relay station 2 and the underground mobile station 3, namely, conventional wireless mobile communication links and short-range cross-medium through-the-ground mobile communication links. When the underground relay station 2 and the underground mobile station 3 are underground, with air as the propagation medium, the underground relay station 2 can select different wireless communication protocols such as 4G, 5G, WIFI, Bluetooth, ZigBee technology, etc. to realize conventional wireless mobile duplex communication and positioning functions with the underground mobile station 3. At the same time, it is necessary to use the receiving technology of quantum precision measurement to realize low-energy, short-range through-the-ground cross-medium through-the-ground mobile duplex communication between the underground relay station 2 and the underground mobile station 3, so as to meet the needs of mobile communication when the conventional wireless mobile communication link underground is blocked and the activity space of the underground mobile station 3 user is limited. In addition, in the through-the-ground communication mode when the underground mobile station 3 is blocked from the underground relay station 2, it is necessary to realize the positioning function of the underground mobile station 3 based on identity recognition and the cooperation of multiple underground relay stations 2.

[0061] In this embodiment, the short-range cross-medium through-the-ground mobile communication mode between the underground relay station 2 and the underground mobile station 3 is a low-power, short-distance through-the-ground communication, which is different from the high-power, long-range through-the-ground communication mode between the ground station 1 and the underground relay station 2, and between the ground station 1 and the underground mobile station 3.

[0062] Specifically, a through-the-earth mobile communication method based on quantum precision measurement in this embodiment also includes the following steps: an uplink through-the-earth link is: the underground mobile station 3 sends a signal through a third through-the-earth communication module, the underground relay station 2 receives the signal through a second through-the-earth communication module, and then forwards the signal through the second through-the-earth communication module, and the ground station 1 receives the signal through the first through-the-earth communication module; a downlink through-the-earth link is: the ground station 1 transmits a signal through the first through-the-earth communication module, the underground relay station 2 receives the signal through the second through-the-earth communication module, and then forwards the signal through the second through-the-earth communication module, and the underground mobile station 3 receives the signal through the third through-the-earth communication module.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A through-the-earth mobile communication system based on quantum precision measurement, characterized in that: It comprises a ground station (1), a plurality of underground relay stations (2) and a plurality of underground mobile stations (3); The ground station (1) is arranged on the ground, and comprises a first through-the-ground communication module and a ground control unit; the underground relay station (2) is arranged underground, and comprises a second through-the-ground communication module, a first underground control unit and a first wireless transceiver module (14); the underground mobile station (3) is arranged underground, and comprises a third through-the-ground communication module, a second underground control unit and a second wireless transceiver module; The ground station (1) is connected to the underground relay station (2) and the underground mobile station (3) through a first through-the-ground communication module; the underground relay station (2) is connected to the ground station (1) through a second through-the-ground communication module, and is connected to the underground mobile station (3) through the second through-the-ground communication module; the underground mobile station (3) is connected to the ground station (1) and the underground relay station (2) through a third through-the-ground communication module, thereby forming a through-the-ground communication link; The first through-the-earth communication module comprises a first atomic magnetometer receiving module (4) and a ground magnetic field transmitting module (8), wherein the first atomic magnetometer receiving module (4) is used to receive a low-frequency magnetic field long-distance through-the-earth communication signal sent by a transmitting end of the second through-the-earth communication module and transmit the signal to the ground control unit, and the ground magnetic field transmitting module (8) is used to transmit the communication signal processed by the ground control unit through a low-frequency magnetic field carrier; The second through-the-earth communication module and the third through-the-earth communication module both comprise a second atomic magnetometer receiving module (9) and an underground magnetic field transmitting module (13); In the second through-the-earth communication module, the second atomic magnetometer receiving module (9) is used to receive the low-frequency magnetic field long-range through-the-earth communication signal sent by the first through-the-earth communication module, and is also used to receive the low-frequency magnetic field short-range through-the-earth communication signal sent by the third through-the-earth communication module, and the underground magnetic field transmitting module (13) is used to transmit the communication signal processed by the first underground control unit through the low-frequency magnetic field carrier; In the third through-the-earth communication module, the second atomic magnetometer receiving module (9) is used to receive a low-frequency magnetic field long-range through-the-earth communication signal sent by a transmitting end of the first through-the-earth communication module or a low-frequency magnetic field short-range through-the-earth communication signal sent by a transmitting end of the second through-the-earth communication module, and the underground magnetic field transmitting module (13) is used to transmit the communication signal processed by the second underground control unit through a low-frequency magnetic field carrier; The first wireless transceiver module (14) and the second wireless transceiver module are used to establish a conventional wireless mobile communication link between the underground relay station (2) and the underground mobile station (3).

2. According to claim 1, a through-the-earth mobile communication system based on quantum precision measurement is characterized in that: The first atomic magnetometer receiving module (4) and the second atomic magnetometer receiving module (9) are three-axis atomic magnetometers or two-axis atomic magnetometers.

3. The through-the-earth mobile communication system based on quantum precision measurement according to claim 1, characterized in that: In the first through-the-earth communication module, the second through-the-earth communication module and the third through-the-earth communication module, the atomic magnetometer uses multi-axis synchronous detection to realize orthogonal polarization signal differential and redundant detection modes.

4. The through-the-earth mobile communication system based on quantum precision measurement according to claim 1, characterized in that: The first wireless transceiver module (14) and the second wireless transceiver module respectively include one or more of a 4G communication module, a 5G communication module, a WIFI communication module, a Bluetooth communication module or a ZigBee communication module.

5. The through-the-earth mobile communication system based on quantum precision measurement according to claim 1, characterized in that: The first through-the-earth communication module further comprises a first baseband signal processor (5) and a ground power amplifier (7); the first baseband signal processor (5) is connected to the ground control unit (6), the first atomic magnetometer receiving module (4) and the ground power amplifier (7); the ground power amplifier (7) is connected to the ground magnetic field transmitting module (8); the communication signal processed by the ground control unit (6) is modulated by the first baseband signal processor (5), amplified by the ground power amplifier (7) and then transmitted by the ground magnetic field transmitting module (8); the signal received by the first atomic magnetometer receiving module (4) is demodulated by the first baseband signal processor (5) and then transmitted to the ground control unit (6).

6. The through-the-earth mobile communication system based on quantum precision measurement according to claim 1, characterized in that: The second through-the-ground communication module further comprises an underground baseband signal processor (10) and an underground power amplifier (12). In the second through-the-ground communication module, the underground baseband signal processor (10) is connected to the underground control unit (11), the second atomic magnetometer receiving module (9) and the underground power amplifier (12), and the underground power amplifier (12) is connected to the underground magnetic field transmitting module (13). The output signal of the underground control unit (11) is modulated by the underground baseband signal processor (10), amplified by the underground power amplifier (12), and then transmitted by the underground magnetic field transmitting module (13). The signal received by the second atomic magnetometer receiving module (9) is demodulated by the underground baseband signal processor (10) and then transmitted to the underground control unit (11). The first wireless transceiver module (14) is respectively connected to the first underground control unit (11) through the underground baseband signal processor (10).

7. The through-the-earth mobile communication system based on quantum precision measurement according to claim 1, characterized in that: The underground relay station (2) and the underground mobile station (3) serving as underground terminals also include backup batteries.

8. The through-the-earth mobile communication system based on quantum precision measurement according to claim 1, characterized in that: The above-ground magnetic field transmitting module (8) and the underground magnetic field transmitting module (13) are magnetic field generating coils or magnetic field generating electrodes.

9. A method for through-the-earth mobile communication based on quantum precision measurement, characterized in that: A through-the-ground mobile communication system according to claim 1 is implemented, comprising the following steps: in a conventional communication mode, a long-range through-the-ground duplex communication is implemented between a ground station (1) and an underground relay station (2), the ground station (1) sends a signal to the underground relay station (2), the underground relay station (2) receives the signal and forwards it to an underground mobile station (3), the underground mobile station (3) sends a signal to the underground relay station (2), and the underground relay station (2) forwards the signal to the ground station (1) via a long-range through-the-ground link; specifically, the uplink is: on the one hand, the underground mobile station (3) can send a signal through the second wireless transceiver module, and the underground relay station (2) receives the signal through the first wireless transceiver module (14), thereby forming an underground conventional wireless mobile communication uplink; on the other hand, the underground mobile station (3) can send a short-range through-the-ground signal through the third through-the-ground communication module The underground relay station (2) receives the signal through the second underground through-ground module, forming an underground short-range cross-medium through-ground mobile communication uplink; then the signal is forwarded through the second through-ground communication module of the underground relay station (2), and the ground station (1) receives the signal through the first through-ground communication module; the downlink is: the ground station (1) sends the signal to the long-range through-ground link through the first through-ground communication module, the underground relay station (2) receives the signal through the second through-ground communication module and forwards it to the conventional wireless mobile communication downlink through the first wireless transceiver module (14), or forwards it to the short-range cross-medium through-ground mobile communication downlink through the second through-ground communication module, and the underground mobile station (3) receives the signal from the conventional wireless mobile communication downlink through the second wireless transceiver module, or receives the signal from the short-range cross-medium through-ground mobile communication downlink through the third through-ground communication module; In the emergency communication mode, the ground station (1) directly sends emergency information and rescue instructions to the underground mobile station (3) via the first through-the-ground communication module via the long-range through-the-ground communication downlink, and the underground mobile station (3) receives signals from the long-range through-the-ground communication downlink via the third through-the-ground communication module, thereby completing the broadcast release and reception of emergency information.

10. The method for through-the-earth mobile communication based on quantum precision measurement according to claim 9, characterized in that: There are two types of underground mobile communication links, namely short-range cross-medium through-ground mobile communication links and conventional wireless mobile communication links; the underground mobile station (3) sends a signal to the short-range cross-medium through-ground mobile communication link through the third through-ground communication module, the underground relay station (2) receives a signal from the short-range cross-medium through-ground mobile communication link through the second through-ground communication module, the underground relay station (2) sends a signal to the short-range cross-medium through-ground mobile communication link through the second through-ground communication module, and the underground mobile station (3) receives a signal from the short-range cross-medium through-ground mobile communication link through the third through-ground communication module, thereby realizing underground short-range cross-medium through-ground duplex mobile communication; The underground mobile station (3) sends a signal to a conventional wireless mobile communication link through the second wireless transceiver module, and the underground relay station (2) receives a signal from the conventional wireless mobile communication link through the first wireless transceiver module (14). The underground relay station (2) sends a signal to the conventional wireless mobile communication link through the first wireless transceiver module (14), and the underground mobile station (3) receives a signal from the conventional wireless mobile communication link through the second wireless transceiver module, thereby realizing underground conventional wireless duplex mobile communication.

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