Mining communication positioning system and method based on RIS

Abstract

The invention belongs to the technical field of intelligent mine communication positioning, and discloses a mining communication positioning system and method based on RIS, and the system comprises a mining communication base station which is used for transmitting and receiving a communication signal to user equipment, and / or is used for achieving a positioning function; the mining communication positioning terminal equipment is used for a user to access a network service and comprises the steps of generating, sending and receiving a communication signal; the mining RIS equipment is used for changing communication signal transmission characteristics and / or realizing a positioning function; and the mining communication transmission network is used for transmitting communication signals among the mining communication base station, the mining RIS equipment and the mining communication positioning terminal equipment. The mining communication positioning terminal can be positioned under a coal mine, the cost of network equipment can be reduced, network interference can be reduced, and the communication quality can be improved.

Description

Technical Field

[0001] The present application belongs to the field of positioning technology in intelligent mine communications, and specifically, relates to a mine communication positioning system and method based on RIS. Background Art

[0002] The development of intelligent coal mines has continuously improved the safety of coal mine production. The development of coal mine production technology has begun to develop from mechanization and automation to intelligence, and coal mining and transportation have also developed towards less-manned and unmanned operations. In this process, cellular network mobile communication technologies represented by 5G for mining have played a huge role.

[0003] Although the underground coal mine scene supports cellular communication, it does not support positioning technology based on cellular communication, which is mainly restricted by the working scene and base station deployment characteristics of the underground coal mine. On the one hand, non-linear tunnels will cause communication signal transmission to be blocked and communication quality to decline, thus affecting the performance of communication and positioning; on the other hand, positioning technology based on cellular communication generally requires multiple base stations to jointly realize the positioning of the terminal, while underground coal mines are mostly deployed with a single base station, that is, a single mining base station covers part of the area, and the mining base stations are deployed along the direction of the tunnel or key areas as a whole, so as to realize cellular network coverage in the coal mine. Mining terminals are often only located within the coverage range of one mining base station, which violates the prerequisite for positioning based on cellular communication, and therefore the positioning function in the coal mine cannot be realized.

[0004] To achieve the positioning function, the existing means is to deploy more mining base stations and increase the density of mining base stations, but this will cause the following two problems: One is that deploying more mining base stations will naturally increase the deployment cost of network equipment. Under the Class I explosion-proof conditions specified in GB3836, the wireless RF transmission power does not exceed 6W, and the underground base stations are already very dense, which will cause a significant increase in costs, the density of base station deployment is extremely high, and the deployment and maintenance workload is extremely large. Another problem is that network interference leads to a decrease in communication quality. Deploying more mining base stations in the confined space underground in coal mines will increase interference between cells and affect communication quality. It is not feasible to perform positioning underground in coal mines by deploying multiple base stations.

[0005] Therefore, positioning in coal mines has become a technical problem that urgently needs to be solved. Summary of the invention

[0006] In order to solve the deficiencies in the prior art, the present invention provides a mine communication positioning system based on RIS, which realizes the positioning of mine communication positioning terminals in coal mines, and at the same time reduces the cost of network equipment, reduces network interference, and improves communication quality.

[0007] The present invention adopts the following technical solution.

[0008] The first aspect of the present invention provides a mine communication and positioning system based on RIS, the system comprising: a mine communication base station, a mine communication and positioning terminal device, a mine RIS device and a mine communication transmission network, wherein the mine communication base station is used to send and receive communication signals to user devices, and / or to realize the positioning function; the mine communication and positioning terminal device is used for users to access network services, including generating, sending and receiving communication signals; the mine RIS device is used to change the transmission characteristics of communication signals, and / or to realize the positioning function; the mine communication transmission network is used to transmit communication signals between the mine communication base station, the mine RIS device and the mine communication and positioning terminal device.

[0009] Preferably, the mine communication positioning terminal device is positioned by means of a mine communication base station and a mine RIS device.

[0010] Preferably, the number of mine communication base stations is a first value, and the number of mine RIS devices is a second value; wherein the first value and the second value are both positive integers, and the sum of the first value and the second value is greater than or equal to 3.

[0011] Preferably, positioning the mine communication and positioning terminal device through the mine communication base station and the mine RIS device includes: measuring the distance between the mine communication and positioning terminal device and the mine RIS device; measuring the distance between the mine communication and positioning terminal device and the mine communication base station; positioning the mine communication and positioning terminal device according to the distance between the mine communication and positioning terminal device and the mine RIS device and the position of the mine RIS device, and the distance between the mine communication and positioning terminal device and the mine communication base station and the position of the mine communication base station.

[0012] Preferably, measuring the distance between the mine communication and positioning terminal device and the mine RIS device includes: determining the bilateral two-way transmission time of the communication signal between the mine communication and positioning terminal device and the mine RIS device; and determining the distance between the mine communication and positioning terminal device and the mine RIS device based on the bilateral two-way transmission time.

[0013] Preferably, the bilateral two-way transmission of communication signals between the mine communication and positioning terminal equipment and the mine RIS equipment includes: the mine RIS equipment sends a first positioning signal to the mine communication and positioning terminal equipment; the mine communication and positioning terminal equipment receives the first positioning signal; the mine communication and positioning terminal equipment sends a second positioning signal to the mine RIS equipment; the mine RIS equipment receives the second positioning signal.

[0014] Preferably, determining the bilateral two-way transmission time of the communication signal between the mine communication and positioning terminal equipment and the mine RIS equipment includes: obtaining the first moment when the mine RIS equipment sends the first positioning signal to the mine communication and positioning terminal equipment; obtaining the second moment when the mine communication and positioning terminal equipment receives the first positioning signal; obtaining the third moment when the mine communication and positioning terminal equipment sends the second positioning signal to the mine RIS equipment; obtaining the fourth moment when the mine RIS equipment receives the second positioning signal; and calculating the bilateral two-way transmission time of the communication signal between the mine communication and positioning terminal equipment and the mine RIS equipment according to the first moment, the second moment, the third moment and the fourth moment.

[0015] Preferably, according to T RIS-终端 =(t13-t10)-(t12-t11) Calculate the bilateral two-way transmission time T of the communication signal between the mine communication positioning terminal equipment and the mine RIS equipment RIS-终端 ; Among them, t10 is the first moment, t11 is the second moment, t12 is the third moment, and t13 is the fourth moment.

[0016] Preferably, D is calculated RIS-终端 =T RIS-终端 *c / 2 to get the distance D between the mine communication positioning terminal equipment and the mine RIS equipment based on the bilateral two-way transmission time RIS-终端 , T RIS-终端 is the bilateral two-way transmission time, and c is the speed of light.

[0017] Preferably, according to the distance between the mine communication and positioning terminal equipment and the mine RIS equipment and the position of the mine RIS equipment, and the distance between the mine communication and positioning terminal equipment and the mine communication base station and the position of the mine communication base station, positioning the mine communication and positioning terminal equipment includes: determining a first circle with the position of the mine RIS equipment as the center and the distance between the mine communication and positioning terminal equipment and the mine RIS equipment as the radius; determining a second circle with the position of the mine communication base station as the center and the distance between the mine communication and positioning terminal equipment and the mine communication base station as the radius; positioning the mine communication and positioning terminal equipment according to the first circle and the second circle.

[0018] Preferably, obtaining the first moment when the mining RIS device sends the first positioning signal to the mining communication positioning terminal device and obtaining the fourth moment when the mining RIS device receives the second positioning signal include:

[0019] Acquire, through the time submodule in the mining RIS device, the first moment when the mining RIS device sends the first positioning signal to the mining communication positioning terminal device and the fourth moment when the mining RIS device receives the second positioning signal;

[0020] or,

[0021] Based on the bilateral two-way transmission time of the communication signal between the mine communication base station and the mine communication positioning terminal equipment and the distance between the mine communication base station and the mine RIS equipment, the first moment when the mine RIS equipment sends the first positioning signal to the mine communication positioning terminal equipment and the fourth moment when the mine RIS equipment receives the second positioning signal are calculated.

[0022] Preferably, the system further comprises: determining an error calibration factor based on the distance between the mine communication base station and the mine RIS device, and the transmission time of the communication signal between the mine communication base station and the mine RIS device; and correcting the measured distance between the mine communication positioning terminal device and the mine RIS device based on the error calibration factor.

[0023] Preferably, the system also includes: based on distinguishing factors, distinguishing the communication signals transmitted directly from the mine communication base station to the mine communication positioning terminal equipment and the communication signals transmitted from the mine communication base station to the mine communication positioning terminal equipment through the mine RIS equipment, and the distinguishing factors include at least one of the following: information carried by the communication signal, signal delay, signal power, signal power spectrum density, signal phase and signal angle.

[0024] Preferably, the mining RIS device includes at least one of the following: a time submodule for measuring and recording the time of sending or receiving a communication signal; a communication submodule for realizing communication between the mining RIS device and a mining communication base station, and / or between the mining RIS device and a mining communication positioning terminal device.

[0025] The second aspect of the present invention provides a RIS-based mine communication positioning method, which is applied to the above-mentioned RIS-based mine communication system, and the method includes: measuring the distance between the mine communication positioning terminal equipment and the mine RIS equipment and / or the distance between the mine communication positioning terminal equipment and the mine communication base station; locating the mine communication positioning terminal equipment according to the distance between the mine communication positioning terminal equipment and the mine RIS equipment and / or the distance between the mine communication positioning terminal equipment and the mine communication base station.

[0026] The third aspect of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program implements the above-mentioned RIS-based mine communication positioning method when loaded into the processor.

[0027] The fourth invention of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned RIS-based mine communication positioning method is implemented.

[0028] Compared with the prior art, the beneficial effects of the present invention include at least:

[0029] The mine communication and positioning system based on RIS proposed in the present invention can support the positioning function of a single mine base station through the positioning technology based on the bilateral two-way transmission time of the communication signal in the coal mine. And it realizes that one network and one system support the communication and positioning functions at the same time, ensures the utilization rate of the coal mine cellular network, and reduces the network deployment cost. Moreover, by deploying RIS equipment, the present invention not only reduces the deployment density and number of mine communication base stations, and reduces the deployment cost of coal mine underground communication equipment; and there is no need to deploy more mine base stations in the confined space in the coal mine, thereby reducing the interference between cells and improving the communication quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0031] Figure 1 This is a schematic diagram of a coal mine tunnel communication scenario provided by an embodiment of the present invention;

[0032] Figure 2 It is a schematic diagram of a mine communication positioning system based on RIS provided by an embodiment of the present invention;

[0033] Figure 3 It is a schematic diagram of a bilateral two-way communication signal transmission process in a coal mine provided by an embodiment of the present invention;

[0034] Figure 4 It is a schematic diagram of joint positioning of a coal mine tunnel RIS device and a mine communication base station provided by an embodiment of the present invention;

[0035] Figure 5 It is a schematic diagram of a signal transmission process of a mine communication positioning system provided by an embodiment of the present invention;

[0036] Figure 6 is a schematic diagram of a RIS device architecture provided by an embodiment of the present invention;

[0037] Figure 7 The present invention provides a schematic diagram of the equipment distribution of a mine communication and positioning system. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0039] Although the underground coal mine scene supports cellular communication, it does not support positioning technology based on cellular communication, such as Figure 1 As shown in the figure, it is mainly restricted by the working scene and base station deployment characteristics in coal mines. On the one hand, non-linear tunnels will cause communication signal transmission to be blocked and communication quality to decline, thus affecting the performance of communication and positioning; on the other hand, positioning technology based on cellular communication generally requires multiple base stations to jointly realize the positioning of the terminal, while coal mines are mostly deployed with a single base station. Therefore, positioning technology based on cellular communication cannot be implemented in coal mines at present.

[0040] Positioning technology based on cellular communication often requires multiple anchor nodes (base stations) to work together to achieve the positioning of the target node (terminal), but the underground coal mine is a single mine base station deployment scenario, that is, a single mine base station covers part of the area, and the mine base station is deployed along the direction of the tunnel or key areas as a whole, so as to achieve cellular network coverage in the coal mine. Therefore, relying solely on the current deployment strategy of mine base stations, mine terminals are often only located within the coverage of one mine base station, which violates the premise of positioning based on cellular communication, and therefore cannot achieve the positioning function in the coal mine.

[0041] RIS (Reconfigurable Intelligent Surface) is an artificial electromagnetic surface structure with programmable electromagnetic properties. A large number of electromagnetic units are regularly arranged on its surface. By applying a control signal to each electromagnetic unit, the electromagnetic properties of the electromagnetic unit (such as capacitive reactance, impedance, and inductive reactance, etc.) can be dynamically adjusted to achieve dynamic regulation of electromagnetic waves in space, thereby intelligently adjusting the wireless transmission channel and reconstructing the wireless propagation environment.

[0042] like Figure 2As shown, Embodiment 1 of the present invention provides a mine communication and positioning system based on RIS. The mine communication and positioning system comprises a mine communication base station, a mine communication and positioning terminal device, a mine RIS device and a mine communication transmission network. The mine communication base station is used to send and receive communication signals to user devices, and / or to realize the positioning function; the mine communication and positioning terminal device is used for user access to network services, including generating, sending and receiving communication signals; the mine RIS device is used to change the transmission characteristics of communication signals, and / or to realize the positioning function; the mine communication transmission network is used for the mine communication base station, the mine RIS device and the mine communication and positioning terminal device to transmit communication signals.

[0043] Specifically, the mining RIS device has an artificial electromagnetic surface structure with programmable electromagnetic properties, which is used to change the communication signal transmission characteristics, so that the communication signal emitted by the mining communication base station is transmitted to the mining communication positioning terminal device through the mining RIS device, and the communication signal emitted by the mining positioning terminal device is transmitted to the mining communication base station through the mining RIS device.

[0044] Specifically, the mining RIS equipment performs a first operation, which may be at least one of reflecting a communication signal, transmitting a communication signal, refracting a communication signal, adjusting the power of a communication signal, adjusting the power spectrum density of a communication signal, adjusting the energy of a communication signal, adjusting the phase of a communication signal, and adjusting the reflection angle of a communication signal.

[0045] The communication signal is at least one of a positioning reference signal, a sounding reference signal, a signal for transmitting data information, a signal for transmitting control information, and a signal for transmitting synchronization information.

[0046] It is understandable that the general base station for mining can be a 4G / 5G / 6G base station or a base station of a subsequent evolution version. The communication and positioning terminal equipment for mining can be a mobile phone terminal of 4G / 5G / 6G or a subsequent evolution version, CPE (Customer Premise Equipment) or other types of mining terminals such as mining bracelets / watches and mining lamps.

[0047] Figure 2The connecting lines in can also represent the transmission of communication signals. For example, the signal transmitted by the mine communication base station is transmitted to the mine communication positioning terminal device after passing through the mine reconfigurable intelligent metasurface device, and the signal transmitted by the mine communication positioning terminal device is transmitted to the mine communication base station after passing through the mine reconfigurable intelligent metasurface device. The mine communication base station and the mine communication positioning terminal device can also be directly transmitted. In addition, it can also include the communication between different mine communication positioning terminal devices, such as the communication between a mine smart watch and a mine mobile phone terminal, that is, the signal transmitted by one mine communication positioning terminal device is transmitted to another mine communication positioning terminal device after passing through the mine reconfigurable intelligent metasurface device.

[0048] Preferably, the mine communication positioning terminal device is positioned by means of a mine communication base station and a mine RIS device.

[0049] In this embodiment, the function of positioning the mine communication positioning terminal device is realized by using the mine communication base station and the mine RIS device, which can solve the problem that the coal mine cannot be positioned in the case of a single base station. Since the cost of the mine RIS device is relatively low, the cost of realizing the positioning function can be reduced. And compared with the problem of low communication quality caused by cell interference when multiple base stations are positioned, this embodiment does not need to change the existing mine communication base station deployment strategy, and the positioning problem in the coal mine can be realized by the mine RIS device to improve the communication quality. In addition, compared with the problem of high base station maintenance cost when multiple base stations are positioned, the maintenance workload of the mine RIS device in this embodiment is reduced, the maintenance efficiency is improved, and the maintenance cost is reduced.

[0050] Preferably, the number of mine communication base stations is a first value, and the number of mine RIS devices is a second value; wherein the first value and the second value are both positive integers, and the sum of the first value and the second value is greater than or equal to 3.

[0051] For example, the number of mine communication base stations may be 1, and the number of mine RIS devices may be 2. Alternatively, the number of mine communication base stations may be 2, and the number of mine RIS devices may be 1. Alternatively, the number of mine communication base stations may be 1, and the number of mine RIS devices may be 3.

[0052] Preferably, positioning the mine communication positioning terminal device by using the mine communication base station and the mine RIS device includes:

[0053] Step 1: Measure the distance between the mine communication and positioning terminal equipment and the mine RIS equipment; Measure the distance between the mine communication and positioning terminal equipment and the mine communication base station.

[0054] Specifically, measuring the distance between the mine communication positioning terminal device and the mine communication base station includes:

[0055] Determine the bilateral two-way transmission time of the communication signal between the mine communication base station and the mine communication positioning terminal equipment; determine the distance between the mine communication base station and the mine communication positioning terminal equipment based on the bilateral two-way transmission time.

[0056] Combination Figure 3 As shown in the figure, the bilateral two-way transmission process of the communication signal between the mine communication base station and the mine communication positioning terminal equipment is as follows:

[0057] The first moment may be t10, the second moment may be t11, the third moment may be t12, and the fourth moment may be t13. The mine initialization device (in this embodiment, the mine communication base station) sends a first positioning signal at t10, such as DLPRS (Downlink Positioning Reference Signal). The first positioning signal is transmitted through space, and the mine response device (in this embodiment, the mine communication positioning terminal device) receives the first positioning signal at t11 ​​and sends a second positioning signal at t12, such as SRS (Sounding Reference Signal). The second positioning signal is transmitted through space, and the mine initialization device receives the second positioning signal at t13. Then the bilateral two-way transmission time T of the underground communication signal in the coal mine 基站-终端 =t13-t10-(t12-t11). The distance D between the mine communication base station and the mine communication positioning terminal equipment 基站-终端 =T 基站-终端 *c / 2, where c represents the speed of light.

[0058] Specifically, measuring the distance between the mine communication positioning terminal device and the mine RIS device specifically includes:

[0059] Step 101, determining the bilateral two-way transmission time of the communication signal between the mine communication positioning terminal device and the mine RIS device. Step 101 specifically includes:

[0060] Acquire the first moment when the mining RIS device sends a first positioning signal to the mining communication positioning terminal device;

[0061] Acquire the second moment when the mine communication and positioning terminal device receives the first positioning signal;

[0062] Acquire the third moment when the mine communication and positioning terminal device sends the second positioning signal to the mine RIS device;

[0063] Obtaining a fourth moment when the mining RIS device receives the second positioning signal;

[0064] The bilateral two-way transmission time of the communication signal between the mine communication and positioning terminal equipment and the mine RIS equipment is calculated according to the first moment, the second moment, the third moment and the fourth moment.

[0065] Specifically, according to T RIS-终端 =(t13-t10)-(t12-t11) Calculate the bilateral two-way transmission time T of the communication signal between the mine communication positioning terminal equipment and the mine RIS equipment RIS-终端 ; Among them, t10 is the first moment, t11 is the second moment, t12 is the third moment, and t13 is the fourth moment.

[0066] Preferably, obtaining the first moment when the mining RIS device sends the first positioning signal to the mining communication and positioning terminal device and the fourth moment when the mining RIS device receives the second positioning signal includes: calculating the first moment when the mining RIS device sends the first positioning signal to the mining communication and positioning terminal device and the fourth moment when the mining RIS device receives the second positioning signal based on the bilateral two-way transmission time of the communication signal between the mining communication base station and the mining communication and positioning terminal device and the distance between the mining communication base station and the mining RIS device.

[0067] In this embodiment, the mining RIS device does not have the function of measuring the time when the mining RIS device sends and receives communication signals, so the time when the mining RIS device sends and receives communication signals is indirectly obtained. Figure 7 As shown, the communication signal transmission time of the mine communication base station is t0. The distance D between the mine communication base station and the mine RIS equipment is known. 基站-RIS , then the signal transmission delay between the mine communication base station and the mine RIS equipment is D 基站-RIS / c, then the transmission time of the communication signal after passing through the mine RIS device to the mine communication positioning terminal device, that is, the first moment when the mine RIS device sends the first positioning signal to the mine communication positioning terminal device is t0+D 基站-RIS / c; the communication signal receiving time of the mine communication base station is t7, and the distance D between the mine communication base station and the mine RIS equipment is known 基站-RIS , then the transmission delay between the mine communication base station and the mine RIS equipment is D 基站-RIS / c, the transmission time of the communication signal after passing through the mine RIS device to the mine communication base station, that is, the fourth moment when the mine RIS device receives the second positioning signal is t7-D 基站-RIS / c.

[0068] Preferably, obtaining the first moment when the mining RIS device sends the first positioning signal to the mining communication positioning terminal device and the fourth moment when the mining RIS device receives the second positioning signal includes:

[0069] The first moment when the mining RIS device sends the first positioning signal to the mining communication positioning terminal device and the fourth moment when the mining RIS device receives the second positioning signal are obtained through the time submodule in the mining RIS device.

[0070] In this embodiment, the mining RIS device includes a time submodule, such as a crystal oscillator submodule. The time submodule is used to measure and record the time when the mining RIS device sends and receives communication signals. The mining RIS device has time measurement and communication capabilities. The time positioning process based on the bilateral two-way transmission of communication signals in underground coal mines only needs to consider the bilateral two-way transmission of communication signals between the mining RIS device and the mining communication positioning terminal device, that is, the mining RIS device determines the time to send PRS and receive SRS, and the mining communication positioning terminal determines the time to receive PRS and send SRS, thereby determining the bilateral two-way transmission time of the underground coal mine communication signal and performing ranging.

[0071] Step 102: Determine the distance between the mining RIS device and the mining communication and positioning terminal device based on the bilateral two-way transmission time.

[0072] Preferably, D is calculated RIS-终端 =T RIS-终端 *c / 2 to get the distance D between the mining RIS equipment and the mining communication positioning terminal equipment based on the bilateral two-way transmission time RIS-终端 , T RIS-终端 is the bilateral two-way transmission time, and c is the speed of light.

[0073] In practical applications, such as Figure 3 As shown, Figure 3 This is a bilateral two-way transmission process based on a communication signal in an embodiment of the present invention. The first moment may be t10, the second moment may be t11, the third moment may be t12, and the fourth moment may be t13. The mining initialization device sends a first positioning signal at t10, such as DLPRS (Downlink Positioning Reference Signal). The first positioning signal is transmitted through space. The mining response device receives the first positioning signal at t11 ​​and sends a second positioning signal at t12, such as SRS (Sounding Reference Signal). The second positioning signal is transmitted through space, and the mining initialization device receives the second positioning signal at t13. Then the bilateral two-way transmission time T of the underground communication signal in the coal mine is RIS-终端 =t13-t10-

[0074] (t12-t11). The distance between the initialization equipment and the response equipment in the coal mine is T RIS-终端*c / 2, where c represents the speed of light. The coal mine underground initialization device may be a mine communication base station or a mine RIS device, and the coal mine underground response device is the device under test, such as a mine communication positioning terminal device.

[0075] Preferably, the distance between the mine RIS device and the mine communication positioning terminal device is indirectly determined based on the bilateral two-way transmission of the communication signal between the mine communication base station and the mine communication positioning terminal device, including:

[0076] Determine the bilateral two-way transmission time of the communication signal between the mine communication base station and the mine communication positioning terminal equipment;

[0077] Determine the first distance based on the bilateral two-way transmission time; the first distance is the distance between the mine communication base station and the mine communication positioning terminal device;

[0078] Determine the distance between the mine RIS equipment and the mine communication positioning terminal equipment.

[0079] Among them, the communication signal is sent by the mining base station and passes through the mining RIS device to reach the mining communication and positioning terminal device; the distance between the mining RIS device and the mining communication and positioning terminal device is the difference between the first distance and the second distance; the first distance is calculated according to the bilateral two-way transmission time*c / 2, where c represents the speed of light; the second distance is the distance between the mining communication base station and the mining RIS device.

[0080] Specifically, combined Figure 5 As shown, the mine communication base station sends the third positioning signal to the mine RIS device; the mine RIS device receives the third positioning signal and sends the first positioning signal to the mine communication positioning terminal; the mine communication positioning terminal receives the first positioning signal and sends the second positioning signal to the mine RIS device; the mine RIS device receives the second positioning signal and sends the fourth positioning signal to the mine communication base station; the mine communication base station receives the fourth positioning signal. According to T 基站-终端 =t7-t0-(t4-t3)-(t2-t1)-(t6-t5) The bilateral two-way transmission time of the communication signal between the mine communication base station and the mine communication positioning terminal equipment is calculated, and the distance D between the mine communication base station and the mine RIS equipment is obtained. 基站-RIS , and, the distance D between the mining RIS equipment and the mining communication positioning terminal equipment RIS-终端 , and the sum is T 基站-终端 *c / 2, since the locations of the mine communication base station and the mine RIS equipment are known, that is, D 基站-RIS Known, so D RIS-终端 =

[0081] T 基站-终端 *c / 2-D 基站-RIS .

[0082] In particular, t1 = t2, t5 = t6, that is, T 基站-终端 =t7-t0-(t4-t3).

[0083] In particular, there is no need to measure t1, t2, t5, and t6 separately. t2-t1 and t6-t5 are known values ​​and can be expressed by △t, that is, T 基站-终端 =t7-t0-(t4-t3)-2*Δt.

[0084] Step 2: locate the mine communication and positioning terminal device according to the distance between the mine communication and positioning terminal device and the mine RIS device and the position of the mine RIS device, and the distance between the mine communication and positioning terminal device and the mine communication base station and the position of the mine communication base station.

[0085] Step 2 specifically includes: determining a first circle with the position of the mine RIS device as the center and the distance between the mine communication positioning terminal device and the mine RIS device as the radius; determining a second circle with the position of the mine communication base station as the center and the distance between the mine communication positioning terminal device and the mine communication base station as the radius; locating the mine communication positioning terminal device according to the first circle and the second circle.

[0086] For example, when the number of mine communication base stations is 1 and the number of mine RIS devices is 2, the number of first circles is 2 and the number of second circles is 1. When the number of mine communication base stations is 2 and the number of mine RIS devices is 1, the number of first circles is 1 and the number of second circles is 2.

[0087] Combination Figure 4 As shown, when the number of mine communication base stations is 1 and the number of mine RIS devices is 2, the distance between the mine communication positioning terminal device and the mine communication base station is measured to be distance 1, the distance between the mine communication positioning terminal device and the mine RIS device 1 is measured to be distance 2, and the distance between the mine communication positioning terminal device and the mine RIS device 2 is measured to be distance 3; the mine communication positioning terminal device is positioned according to the position of the mine RIS device, the position of the mine communication base station, and the distances 1, 2, and 3.

[0088] Preferably, the number of mine communication base stations is 1, the number of mine RIS devices is 3, and the number of first circles is 3, and the mine communication positioning terminal device can be directly positioned according to the three first circle pairs. Specifically, positioning the mine positioning terminal device based on the bilateral two-way transmission time of the communication signal between at least three mine RIS devices includes the following contents:

[0089] The mining RIS device includes a time submodule, which is used to measure and record the time when the mining RIS device sends and receives communication signals; the mining positioning terminal device obtains the bilateral two-way transmission time of the communication signals between at least three mining RIS devices and the mining positioning terminal device respectively; and determines the respective distances between each mining RIS device and the mining positioning terminal device according to each transmission time; the mining positioning terminal determines the position of the mining positioning terminal according to the position of each mining RIS device and the respective distances between each mining RIS device and the mining positioning terminal device.

[0090] It can be understood that the present invention requires at least three circles to determine the position of the mine communication and positioning terminal device, and the intersection of the three circles is the position of the mine communication and positioning terminal device. The distance required to form the three circles can be the distance between three mine RIS devices and the mine positioning terminal device, or the distance between one mine base station and the mine positioning terminal device and the distance between two mine RIS devices and the mine positioning terminal device, or the distance between two mine base stations and the mine positioning terminal device and the distance between one mine RIS device and the mine positioning terminal device.

[0091] Furthermore, the system also includes: step 3, determining an error calibration factor based on the distance between the mine communication base station and the mine RIS device, and the transmission time of the communication signal between the mine communication base station and the mine RIS device; and correcting the measured distance between the mine communication positioning terminal device and the mine RIS device based on the error calibration factor.

[0092] Combination Figure 5 and Figure 7 As shown, it is known that the distance between the mine communication base station and the mine RIS equipment is D 基站-RIS , the signal transmission delay between the two is measured to be t1-t0, and the distance measured based on the transmission time is D 基站-RIS '=(t1-t0)*c, then the error calibration factor is (D 基站-RIS '-D 基站-RIS ) / D 基站-RIS The theoretical distance between the mine RIS device and the mine communication positioning terminal obtained based on the measurement of the bilateral two-way transmission time of the mine communication signal is D RIS-终端 , then the distance after verification is D RIS-终端 -D RIS-终端 *(D 基站-RIS '-D 基站-RIS ) / D 基站-RIS '. In this way, through correction, the accuracy of positioning the mine communication positioning terminal equipment can be improved.

[0093] Preferably, the system also includes distinguishing, based on distinguishing factors, the communication signals transmitted directly from the mine communication base station to the mine communication positioning terminal device and the communication signals transmitted from the mine communication base station to the mine communication positioning terminal device via the mine RIS device, and the distinguishing factors include at least one of the following: information carried by the communication signal, signal delay, signal power, signal power spectrum density, signal phase and signal angle.

[0094] Specifically, the method of distinguishing the signal transmitted directly from the mine communication base station to the mine communication positioning terminal device and the signal transmitted from the mine communication base station to the mine communication positioning terminal device through the RIS device includes:

[0095] Mode 1: The communication signal passing through the mining RIS device carries additional information indicating that the signal is a signal passing through the mining RIS device;

[0096] Method 2: Differentiate by signal transmission delay, that is, the transmission delay of the signal passing through the mining RIS device is greater than the transmission delay of the signal directly transmitted from the mining communication base station to the mining communication positioning terminal device;

[0097] Method 3: Differentiate by signal power spectrum density, that is, the power spectrum density of the signal passing through the mine RIS device is greater than the power spectrum density of the signal directly transmitted from the mine communication base station to the mine communication positioning terminal device.

[0098] Preferably, the mining RIS equipment includes at least one of the following:

[0099] The time submodule is used to measure and record the time when the communication signal is sent or received;

[0100] The communication submodule is used to realize the communication between the RIS device for mining and the mining communication base station, and / or the RIS device for mining and the mining communication positioning terminal device. For example, the RIS device for mining can send the measured time of sending or receiving the communication signal to the mining communication base station and / or the mining communication positioning terminal.

[0101] Combination Figure 6 As shown, the mining RIS equipment also includes passive metasurface materials and a control submodule. The passive metasurface material submodule is a large number of electromagnetic units made of special materials; the control submodule is used to adjust the electromagnetic properties of the electromagnetic units.

[0102] In particular, the time submodule and / or the communication submodule may belong to the control submodule.

[0103] It is understandable that the above positioning calculation of the mine communication positioning terminal device can be performed in the mine communication base station and other communication network side devices; it can also be performed in the mine communication positioning terminal device. Those skilled in the art can deploy it according to actual needs.

[0104] In practical applications, combined with Figure 4 As shown, when the above positioning calculation of the mine communication positioning terminal device can be executed in the mine communication base station and other communication network side devices, the mine RIS device transmits the time when the mine RIS device sends and receives the communication signal to the mine communication base station, and the mine communication base station determines the position of the mine communication positioning terminal device. The specific contents are as follows:

[0105] The bilateral two-way transmission time of underground communication signals in coal mines is measured between the mine communication base station and the mine communication positioning terminal equipment, including measuring the time t10 when the mine communication base station sends PRS, the time t11 when the mine communication positioning terminal equipment receives PRS, the time t12 when the mine communication positioning terminal equipment sends SRS, and the time t13 when the mine communication base station receives SRS. The mine communication positioning terminal equipment sends t11 and t12 or the difference between (t12-t11) to the mine communication base station, and the mine network side calculates the bilateral two-way transmission time of the communication signal T1=t13-t10-(t12-t11), and calculates the distance D1 between the mine communication base station and the mine communication positioning terminal.

[0106] The bilateral two-way transmission time of underground communication signals in the coal mine is measured between the mining RIS device 1 and the mining communication and positioning terminal device, including measuring the time t20 when the mining RIS device 1 sends PRS, the time t21 when the mining communication and positioning terminal receives PRS, the time t22 when the mining communication and positioning terminal sends SRS, and the time t23 when the mining RIS device 1 receives SRS; the mining RIS device 1 sends the difference between t20 and t23 or (t23-t20) to the mining communication base station, and the mining communication and positioning terminal sends the difference between t21 and t22 or (t22-t21) to the mining communication base station, and the mining network side calculates the bilateral two-way transmission time T2=t23-t20-(t22-t21) of the communication signal, and calculates the distance D2 between the mining RIS device 1 and the mining communication and positioning terminal device.

[0107] The bilateral two-way transmission time of underground communication signals in the coal mine is measured between the mining RIS device 2 and the mining communication and positioning terminal device, including measuring the time t30 when the mining RIS device 2 sends PRS, the time t31 when the mining communication and positioning terminal receives PRS, the time t32 when the mining communication and positioning terminal sends SRS, and the time t33 when the mining RIS device 2 receives SRS; the RIS device 2 sends the difference between t30 and t33 or (t33-t30) to the mining communication base station, and the mining communication and positioning terminal sends the difference between t31 and t32 or (t32-t31) to the mining base station, and the mining network side calculates the bilateral two-way transmission time of the communication signal T3=t33-t30-(t32-t31), and calculates the distance D3 between the mining RIS device 2 and the mining communication and positioning terminal.

[0108] Then the mining network side calculates the location of the mining communication positioning terminal based on the location of the mining communication base station, the location of the mining RIS equipment 1 / 2 and D1 / D2 / D3.

[0109] In another embodiment, the positioning calculation of the mine communication and positioning terminal device can be performed in the mine communication and positioning terminal device, and the specific contents are as follows:

[0110] The measurement of the bilateral two-way transmission time of underground communication signals in coal mines is carried out between the mine communication base station and the mine communication positioning terminal equipment, including measuring the time t10 when the mine communication base station sends PRS, the time t11 when the mine communication positioning terminal receives PRS, the time t12 when the mine communication positioning terminal sends SRS, and the time t13 when the mine communication base station receives SRS. The mine communication base station sends t10 and t13 or the difference between (t13-t10) to the mine communication positioning terminal, and also sends the position of the mine communication base station to the mine communication positioning terminal, which calculates the bilateral two-way transmission time of the communication signal T1=t13-t10-(t12-t11), and calculates the distance D1 between the mine communication base station and the mine communication positioning terminal.

[0111] The bilateral two-way transmission time of underground communication signals in the coal mine is measured between the mine RIS device 1 and the mine communication and positioning terminal, including measuring the time t20 when the mine RIS device 1 sends PRS, the time t21 when the mine communication and positioning terminal receives PRS, the time t22 when the mine communication and positioning terminal sends SRS, and the time t23 when the mine RIS device 1 receives SRS; the mine RIS device 1 sends t20 and t23 or the difference between (t23-t20) to the mine communication and positioning terminal, and also sends the position of the mine RIS device 1 to the mine communication and positioning terminal, and the mine communication and positioning terminal calculates the bilateral two-way transmission time T2=t23-t20-(t22-t21) of the communication signal, and calculates the distance D2 between the mine RIS device 1 and the mine communication and positioning terminal.

[0112] The bilateral two-way transmission time of underground communication signals in the coal mine is measured between the mine RIS device 2 and the mine communication and positioning terminal, including measuring the time t30 when the mine RIS device 2 sends PRS, the time t31 when the mine communication and positioning terminal receives PRS, the time t32 when the mine communication and positioning terminal sends SRS, and the time t33 when the mine RIS device 2 receives SRS; the mine RIS device 2 sends t30 and t33 or the difference between (t33-t30) to the mine communication and positioning terminal, and also sends the position of the mine RIS device 2 to the mine communication and positioning terminal, and the mine communication and positioning terminal calculates the bilateral two-way transmission time of the communication signal T3=t33-t30-(t32-t31), and calculates the distance D3 between the mine RIS device 2 and the mine communication and positioning terminal.

[0113] Then the mine communication positioning terminal device can calculate its own position based on the position of the mine communication base station, the position of the mine RIS device 1 / 2 and D1 / D2 / D3.

[0114] Embodiment 2 of the present invention provides a mine communication positioning method based on RIS, which is applied to the above-mentioned mine communication system based on RIS, and the method includes:

[0115] Measuring the distance between the mine communication and positioning terminal equipment and the mine RIS equipment and / or the distance between the mine communication and positioning terminal equipment and the mine communication base station;

[0116] The mine communication and positioning terminal device is positioned according to the distance between the mine communication and positioning terminal device and the mine RIS device and / or the distance between the mine communication and positioning terminal device and the mine communication base station.

[0117] Embodiment 3 of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the computer program is loaded into the processor, the RIS-based mine communication positioning method described in Embodiment 2 is implemented.

[0118] Embodiment 4 of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the mine communication positioning method based on RIS according to embodiment 2 is implemented.

[0119] Compared with the prior art, the beneficial effects of the present invention include at least:

[0120] The mine communication and positioning system based on RIS proposed in the present invention can support the positioning function of a single mine base station through the positioning technology based on the bilateral two-way transmission time of the communication signal in the coal mine. And it realizes that one network and one system support the communication and positioning functions at the same time, ensures the utilization rate of the coal mine cellular network, and reduces the network deployment cost. Moreover, by deploying RIS equipment, the present invention not only reduces the deployment density and number of mine communication base stations, and reduces the deployment cost of coal mine underground communication equipment; and there is no need to deploy more mine base stations in the confined space in the coal mine, thereby reducing the interference between cells and improving the communication quality.

[0121] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0122] 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 above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A mine communication positioning system based on RIS, characterized in that: The system includes: a mine communication base station, a mine communication positioning terminal device, a mine RIS device and a mine communication transmission network, wherein: A mine communication base station, used to send and receive communication signals to user equipment, and / or to implement a positioning function; Mine communication and positioning terminal equipment, used for users to access network services, including generating, sending and receiving communication signals; RIS equipment for mining, used to change the transmission characteristics of communication signals, and / or to achieve positioning functions; The mine communication transmission network is used to transmit communication signals between mine communication base stations, mine RIS equipment and mine communication positioning terminal equipment.

2. The RIS-based mine communication positioning system according to claim 1, characterized in that: The mine communication positioning terminal equipment is positioned through the mine communication base station and the mine RIS equipment.

3. The RIS-based mine communication positioning system according to claim 2 is characterized in that: The number of mine communication base stations is a first value, and the number of mine RIS devices is a second value; The first value and the second value are both positive integers, and the sum of the first value and the second value is greater than or equal to 3.

4. The RIS-based mine communication positioning system according to claim 2 is characterized in that: The positioning of mine communication positioning terminal equipment through mine communication base station and mine RIS equipment includes: Measure the distance between the mine communication positioning terminal equipment and the mine RIS equipment; Measure the distance between the mine communication positioning terminal equipment and the mine communication base station; The mine communication positioning terminal device is positioned according to the distance between the mine communication positioning terminal device and the mine RIS device and the position of the mine RIS device, and the distance between the mine communication positioning terminal device and the mine communication base station and the position of the mine communication base station.

5. The RIS-based mine communication positioning system according to claim 4 is characterized in that: Measuring the distance between the mine communication positioning terminal equipment and the mine RIS equipment includes: Determine the bilateral two-way transmission time of the communication signal between the mine communication positioning terminal equipment and the mine RIS equipment; The distance between the mine communication and positioning terminal equipment and the mine RIS equipment is determined based on the bilateral two-way transmission time.

6. The RIS-based mine communication positioning system according to claim 5, characterized in that: The bilateral two-way transmission of communication signals between the mine communication positioning terminal equipment and the mine RIS equipment includes: The mining RIS device sends a first positioning signal to the mining communication positioning terminal device; The mine communication and positioning terminal device receives the first positioning signal; The mine communication positioning terminal device sends a second positioning signal to the mine RIS device; The mining RIS device receives the second positioning signal.

7. The RIS-based mine communication positioning system according to claim 6 is characterized in that: Determine the bilateral two-way transmission time of the communication signal between the mine communication positioning terminal equipment and the mine RIS equipment, including: Acquire the first moment when the mining RIS device sends a first positioning signal to the mining communication positioning terminal device; Acquire the second moment when the mine communication and positioning terminal device receives the first positioning signal; Acquire the third moment when the mine communication and positioning terminal device sends the second positioning signal to the mine RIS device; Obtaining a fourth moment when the mining RIS device receives the second positioning signal; The bilateral two-way transmission time of the communication signal between the mine communication and positioning terminal equipment and the mine RIS equipment is calculated according to the first moment, the second moment, the third moment and the fourth moment.

8. The RIS-based mine communication positioning system according to claim 7 is characterized in that: According to T RIS-终端 =(t13-t10)-(t12-t11) Calculate the bilateral two-way transmission time T of the communication signal between the mine communication positioning terminal equipment and the mine RIS equipment RIS-终端 ; Among them, t10 is the first moment, t11 is the second moment, t12 is the third moment, and t13 is the fourth moment.

9. The RIS-based mine communication positioning system according to claim 8, characterized in that: Calculate D RIS-终端 =T RIS-终端 *c / 2 to get the distance D between the mine communication positioning terminal equipment and the mine RIS equipment based on the bilateral two-way transmission time RIS-终端 , T RIS-终端 is the bilateral two-way transmission time, and c is the speed of light.

10. The RIS-based mine communication positioning system according to claim 4, characterized in that: According to the distance between the mine communication positioning terminal device and the mine RIS device and the location of the mine RIS device, and the distance between the mine communication positioning terminal device and the mine communication base station and the location of the mine communication base station, the mine communication positioning terminal device is positioned including: Determine a first circle with the position of the mining RIS device as the center and the distance between the mining communication positioning terminal device and the mining RIS device as the radius; Determine a second circle with the position of the mine communication base station as the center and the distance between the mine communication positioning terminal device and the mine communication base station as the radius; The mine communication and positioning terminal equipment is positioned according to the first circle and the second circle.

11. The RIS-based mine communication positioning system according to claim 7, characterized in that: Acquiring the first moment when the mining RIS device sends the first positioning signal to the mining communication positioning terminal device and acquiring the fourth moment when the mining RIS device receives the second positioning signal includes: Acquire, through the time submodule in the mining RIS device, the first moment when the mining RIS device sends the first positioning signal to the mining communication positioning terminal device and the fourth moment when the mining RIS device receives the second positioning signal; or, Based on the bilateral two-way transmission time of the communication signal between the mine communication base station and the mine communication positioning terminal equipment and the distance between the mine communication base station and the mine RIS equipment, the first moment when the mine RIS equipment sends the first positioning signal to the mine communication positioning terminal equipment and the fourth moment when the mine RIS equipment receives the second positioning signal are calculated.

12. The RIS-based mine communication positioning system according to claim 4, characterized in that: The system further comprises: Determine an error calibration factor based on the distance between the mine communication base station and the mine RIS device, and the transmission time of the communication signal between the mine communication base station and the mine RIS device; The measured distance between the mine communication positioning terminal equipment and the mine RIS equipment is corrected based on the error calibration factor.

13. The RIS-based mine communication positioning system according to any one of claims 1 to 12, characterized in that: The system further comprises: The communication signals directly transmitted from the mine communication base station to the mine communication positioning terminal equipment and the communication signals transmitted from the mine communication base station to the mine communication positioning terminal equipment via the mine communication RIS equipment are distinguished based on distinguishing factors, and the distinguishing factors include at least one of the following: information carried by the communication signal, signal delay, signal power, signal power spectrum density, signal phase and signal angle.

14. The RIS-based mine communication positioning system according to any one of claims 1 to 12, characterized in that: RIS equipment for mining includes at least one of the following: The time submodule is used to measure and record the time when the communication signal is sent or received; The communication submodule is used to realize the communication between the mine RIS device and the mine communication base station, and / or the mine RIS device and the mine communication positioning terminal device.

15. A mine communication positioning method based on RIS, applied to the mine communication system based on RIS as claimed in any one of claims 1 to 14, characterized in that: The method comprises: Measuring the distance between the mine communication and positioning terminal equipment and the mine RIS equipment and / or the distance between the mine communication and positioning terminal equipment and the mine communication base station; The mine communication and positioning terminal device is positioned according to the distance between the mine communication and positioning terminal device and the mine RIS device and / or the distance between the mine communication and positioning terminal device and the mine communication base station.

16. An electronic device, comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is used to operate according to the instructions to execute the steps of the mine communication positioning method based on RIS according to claim 15.

17. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the RIS-based mine communication positioning method described in claim 15 are implemented.

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